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Recovery Library

Doc #21 — Chemical Safety Data

Reactivity, Storage, Handling, and Emergency Response for Chemicals in NZ Settings

Phase: 1–2 (Print Early) | Feasibility: [A] Established

Unreliable — not for operational use. Produced by AI under human direction and editorial review. This document contains errors of fact, judgment, and emphasis and has not been peer-reviewed. See About the Recovery Library for methodology and limitations. © 2026 Recoverable Foundation. Licensed under CC BY-ND 4.0. This disclaimer must be included in any reproduction or redistribution.

EXECUTIVE SUMMARY

Pre-war chemical safety infrastructure — Hazmat services, Poison Centre phone lines, hospital antidote stocks, regulatory inspectors — will operate at reduced capacity or not at all; chemical incidents that were manageable under normal conditions become significantly more dangerous without backup services, increasing the risk of serious injury and death from exposures that would otherwise be treatable. This document provides safety reference data for chemicals commonly encountered in New Zealand industrial, agricultural, household, and medical settings, covering hazard classification, storage requirements, incompatibilities, first aid, fire response, spill procedures, and personal protective equipment (PPE) for each entry. The information is drawn from New Zealand’s Hazardous Substances and New Organisms (HSNO) Act classifications, the EPA NZ Hazardous Substances database, and the Globally Harmonized System of Classification and Labelling of Chemicals (GHS).1 2 3 Prevention through correct storage, separation, and handling is the primary defence.

NZ has particular chemical risks that differ from generic international guidance: widespread agricultural chemical stores in rural areas (often poorly secured), geothermal hydrogen sulfide exposure in the Taupo Volcanic Zone and Bay of Plenty, bulk fuel storage at ports and farms, and a large inventory of chlorine-based water treatment chemicals at municipal plants. This document addresses these NZ-specific conditions.

Page count estimate for the full reference: A comprehensive chemical safety reference covering all chemicals commonly found in NZ — approximately 150–200 entries with full safety data — would require an estimated 300–400 printed pages in A4 format. This document provides the framework and 18 representative sample entries. The complete reference should be generated and printed as a priority during the AI facility’s operational period (Doc #129).

Contents

COMPUTED DATA: CHEMICAL SAFETY REFERENCE

View the Chemical Safety Data → — Safety data for 40 common chemicals, incompatibility matrix, PPE guide, and emergency decontamination procedures.

View the generation script → — Python source code and data sources (EPA NZ, GHS).

Immediate (Days 1–7) — Phase 1

  1. Secure known large chemical stores. Major sites include fertiliser depots (Ballance Agri-Nutrients, Ravensdown), fuel terminals, water treatment plants, and LPG bulk storage. These should be included in the national asset census (Doc #8) and placed under site management with trained personnel.4
  2. Distribute basic chemical safety guidance to anyone now responsible for managing chemical stores who may not have prior training — particularly farm workers inheriting agricultural chemical stores.
  3. Identify and isolate incompatible chemicals at any site where mixed storage exists. Oxidisers separated from fuels. Acids separated from bases. This is the single highest-impact safety action.

Short-term (Weeks 2–8) — Phase 1

  1. Print and distribute this reference to regional civil defence centres, hospitals, fire stations, water treatment plants, major farms, and marae.
  2. Inventory antidote stocks nationally. Atropine (for organophosphate poisoning), calcium gluconate (for hydrofluoric acid burns), cyanide antidote kits — these are finite and must be allocated to sites with the highest exposure risk.
  3. Establish a chemical incident reporting chain so that incidents at one site inform safety practice at others.

Medium-term (Months 2–12) — Phase 1–2

  1. Train chemical handlers. Basic hazmat awareness training for anyone working with agricultural chemicals, water treatment, fuel handling, or industrial processes. Effective training requires both this reference material and hands-on supervision from experienced practitioners who can demonstrate safe procedures, correct technique errors, and assess competency before unsupervised handling is permitted. Where no experienced practitioner is available locally, regional coordination should pair untrained handlers with the nearest qualified person, even if that requires travel.
  2. Generate and print the full chemical safety reference (300–400 pages) from the AI facility while computational and printing resources remain available.

1. HOW TO USE THIS REFERENCE

1.1 Entry format

Each chemical entry in this document follows a standard format:

  • Chemical name and common NZ trade names or uses
  • GHS hazard classification using standard pictograms and signal words5
  • Key hazards (health, fire, reactivity)
  • Storage requirements (temperature, ventilation, containment)
  • Incompatibilities (chemicals that must not be stored or mixed together)
  • First aid (immediate actions — not a substitute for medical care where available)
  • Fire response (appropriate extinguishing media and tactics)
  • Spill response (containment and cleanup)
  • PPE requirements (minimum protection for routine handling)

1.2 Data sources and limitations

The safety data in this document is drawn from:6 7 8

  • NZ EPA Hazardous Substances classifications under the HSNO Act 1996 (as amended by the Health and Safety at Work (Hazardous Substances) Regulations 2017)
  • GHS classifications (7th revised edition, United Nations)
  • Safety Data Sheets (SDS) from NZ suppliers and manufacturers
  • Standard toxicology and industrial hygiene references

These sources are well-established. However, specific product formulations vary between manufacturers, and some NZ trade-name products contain proprietary mixtures whose exact composition may not be fully documented in public sources. Where a chemical is encountered without labelling, treat it as the most hazardous substance consistent with its physical properties (liquid/solid/gas, colour, odour) until identified.

1.3 NZ classification context

NZ’s HSNO classification system assigns hazard classes and categories broadly aligned with GHS.9 The key classes relevant to this document:

HSNO Class Hazard type Examples
2 (Flammable gases) Gas that ignites in air LPG, acetylene
3 (Flammable liquids) Liquid with flash point ≤93°C Petrol, methanol, solvents
5.1 (Oxidising) Provides oxygen, intensifies fire Ammonium nitrate, calcium hypochlorite
6.1 (Acute toxicity) Toxic by ingestion, skin, or inhalation Organophosphates, methanol, hydrogen sulfide
8 (Corrosive) Destroys skin or metals Sulfuric acid, sodium hydroxide
9.1 (Ecotoxic) Toxic to aquatic life Most pesticides, many solvents

2. NZ-SPECIFIC CHEMICAL RISKS

2.1 Agricultural chemical stores

NZ’s agricultural sector uses large volumes of pesticides, herbicides, and fertilisers. These are stored on individual farms, at rural merchant depots (PGG Wrightson, Farmlands), and at manufacturer distribution centres (Ballance, Ravensdown). Rural chemical stores are often managed by a single person with basic training. Under post-event conditions, that person may be unavailable, and someone unfamiliar with the chemicals may inherit responsibility for the store.10

Common agricultural chemicals in NZ include glyphosate (Roundup), 2,4-D, organophosphate and carbamate insecticides, superphosphate fertiliser, urea, and ammonium nitrate-based fertilisers. Of these, the organophosphates and ammonium nitrate present the most serious safety risks — the former due to acute toxicity, the latter due to explosive potential when improperly stored.11

2.2 Geothermal hydrogen sulfide

NZ’s geothermal regions — particularly Rotorua, Taupo, Whakaari/White Island, and the Taupo Volcanic Zone — have ambient hydrogen sulfide (H2S) concentrations that vary from detectable (rotten egg odour at 0.01–0.3 ppm) to immediately dangerous to life and health (IDLH: 50 ppm). Geothermal power stations (Wairakei, Kawerau, Nga Awa Purua, and others) handle high-concentration H2S as part of normal operations, with engineered safety systems and trained operators.12

Under post-event conditions, if geothermal operations continue with reduced staffing (Doc #66), H2S exposure risk increases. Additionally, communities near geothermal areas may experience elevated H2S during volcanic unrest, which is unpredictable. The key safety facts: H2S is heavier than air, accumulates in low-lying areas, and causes olfactory fatigue at concentrations above approximately 100 ppm — meaning the warning odour disappears precisely when the gas becomes most dangerous.13

Traditional knowledge of geothermal hazards predates gas monitors by centuries. Iwi whose rohe (territorial boundaries) include geothermal areas — Tūhoe, Ngāti Tūwharetoa, Te Arawa, Ngāti Awa, and others — have deep empirical knowledge of geothermal terrain, including traditional indicators for dangerous ground: temperature gradients, vegetation absence, soil colour, gas odour gradients, and animal behaviour. The Māori concept of tapu (sacred restriction) was applied to geothermal danger zones as both a spiritual designation and a practical safety mechanism — areas designated tapu were places where entry was forbidden, which in geothermal contexts often corresponded to genuine physical hazard.14 Under post-event conditions with depleted monitoring equipment, elders and traditional knowledge holders in these regions should be consulted alongside engineers when assessing geothermal access risks.

2.3 Bulk fuel storage

NZ’s fuel supply infrastructure includes the Marsden Point fuel import terminal (refinery operations ceased in 2022; it now operates as an import terminal), regional fuel terminals, service stations, and farm diesel tanks.15 Fuel fires and vapour explosions are the primary risks. Petrol vapour is heavier than air and can travel significant distances to ignition sources. Diesel is less volatile but sustains fires once ignited. LPG is stored under pressure and can produce BLEVEs (boiling liquid expanding vapour explosions) if fire impinges on a tank.

2.4 Water treatment chemicals

NZ municipal water treatment plants use chlorine gas, sodium hypochlorite, or calcium hypochlorite for disinfection, along with aluminium sulfate or polyaluminium chloride for coagulation, and sometimes fluoride compounds.16 Chlorine gas is the most dangerous — a leak from a chlorine cylinder in an enclosed space is immediately life-threatening. Sodium hypochlorite is safer but can release chlorine gas if mixed with acid. These plants must be operated by trained personnel under all circumstances (Doc #48).

2.5 Toxic native plants

NZ’s native flora includes several species that present genuine poisoning risks, particularly as post-event conditions change patterns of plant use and food sourcing.17

Karaka (Corynocarpus laevigatus). The fruit kernel contains karakin, a highly toxic glucoside causing convulsions and death. Māori developed a multi-day detoxification process — steaming or boiling the kernels, then prolonged soaking in running water — that renders karaka safe to eat. This is a sophisticated chemical detoxification protocol refined over generations; partial processing produces partially toxic product. This becomes relevant if food scarcity requires processing toxic wild plants. Under the baseline scenario, NZ produces food for approximately 40 million people and karaka processing is unnecessary — but if regional food distribution fails or specific communities lose supply chain access, karaka is one of very few calorie-dense wild foods available in NZ, and correct processing knowledge becomes safety-critical. Karaka kernels should be treated as a toxic substance until properly processed by someone trained in the complete traditional method.18

Tutu (Coriaria arborea). All parts except the fleshy petals contain tutin, a potent GABA antagonist causing seizures. Tutu presents a secondary poisoning risk: bees collecting tutu honeydew produce toxic honey, with outbreaks as recently as 2008. Traditional knowledge identifies tutu, its seasonal distribution, and the contexts in which it creates secondary poisoning risk (honeydew, insects). This is baseline-relevant for beekeepers: as beekeeping expands to compensate for imported sugar loss (Doc #83), more hives will operate in tutu-prone areas, and beekeepers without existing knowledge of tutu risk need this information.

Ngaio (Myoporum laetum). Leaves are toxic to livestock and humans, containing ngaione (a furanosesquiterpene). Burning ngaio produces toxic fumes — a hazard identified in traditional Māori knowledge. This is baseline-relevant: as firewood use increases under energy transition, people unfamiliar with native tree species may inadvertently burn ngaio near food preparation areas. This risk should be included in firewood safety guidance.

3. CHEMICAL SAFETY DATA — SAMPLE ENTRIES

The following 18 entries represent chemicals most likely to be encountered and most consequential for safety in post-event NZ. They are organised by use category.

AGRICULTURAL CHEMICALS

3.1 Glyphosate (Roundup, Weedmaster)

GHS Classification: Health hazard (Category 4 oral toxicity), Serious eye damage (Category 1), Aquatic toxicity (Category 2). Signal word: WARNING.

Key hazards: Low acute toxicity to humans by most routes. Serious eye irritant. Toxic to aquatic organisms. The primary risk is not acute poisoning but eye contact and environmental contamination of waterways.

Storage: Store in original containers, sealed, in a cool dry area. Stable in storage. No special temperature requirements.

Incompatibilities: Strong oxidisers. Galvanised steel or unlined mild steel containers (corrosive to metals in concentrated form).

First aid: Eyes: flush with water for at least 15 minutes. Skin: wash with soap and water. Ingestion: do not induce vomiting; give water; seek medical attention. Inhalation of spray mist: move to fresh air.

Fire response: Not flammable. Use water spray to cool containers in a fire. Decomposition produces toxic fumes (phosphorus oxides, nitrogen oxides).

Spill response: Contain with earth or absorbent material. Prevent entry to waterways. Collect and dispose of in labelled containers.

PPE: Chemical-resistant gloves, safety glasses or goggles, long sleeves. Respirator with particulate filter if generating spray.

3.2 Organophosphate Insecticides (Diazinon, Chlorpyrifos)

GHS Classification: Acute toxicity (Category 2–3 oral, dermal, inhalation), Aquatic toxicity (Category 1). Signal word: DANGER.

Key hazards: Highly toxic. Inhibits acetylcholinesterase, causing nerve agent-like symptoms: salivation, lacrimation, urination, defecation, sweating, miosis (constricted pupils), bradycardia, seizures, respiratory failure. Absorbed through skin, lungs, and gut. Onset within minutes to hours depending on route and dose.19

Storage: Locked storage, separate from food and animal feed. Cool, dry, ventilated. Original containers only. Check regularly for leaks — these chemicals often have a characteristic garlic or mercaptan odour.

Incompatibilities: Strong bases (accelerate hydrolysis — can release toxic breakdown products). Oxidisers.

First aid: Remove contaminated clothing immediately. Wash skin with soap and water for at least 15 minutes. If inhaled, move to fresh air and monitor breathing. Atropine is the specific antidote — administer 2mg IV/IM in adults, repeated every 5–10 minutes until secretions dry. Pralidoxime (2-PAM) within 24–36 hours if available. Seek medical care urgently.20

Fire response: Do not use water jets on the chemical directly (spreads contamination). Use dry chemical, foam, or CO2. Fight fire from upwind. Full protective equipment including SCBA.

Spill response: Evacuate area. Approach from upwind. Absorb with dry earth or vermiculite. Double-bag in sealed containers. Decontaminate area with alkaline solution (soda ash + water).

PPE: Chemical-resistant gloves (nitrile, not latex), chemical splash goggles, coveralls, respirator with organic vapour cartridge. For large-scale handling: full chemical suit.

3.3 Ammonium Nitrate Fertiliser (various NZ brands)

GHS Classification: Oxidiser (Category 3), Acute toxicity (Category 4 oral). Signal word: WARNING.

Key hazards: Strong oxidiser. Not flammable itself, but greatly intensifies fire and can detonate under confinement with heat. The 2020 Beirut explosion (approximately 2,750 tonnes of ammonium nitrate stored improperly for six years) killed 218 people and caused an estimated US$15 billion in damage.21 Smaller-scale incidents have occurred at fertiliser stores worldwide. NZ holds significant stocks at Ballance and Ravensdown depots.

Storage: Separate from all fuels, organic materials, and other combustibles by at least 10 metres. Separate from acids, chlorates, and metal powders. Store in cool, dry, ventilated buildings. Maximum stack height 2.5 metres. No smoking, no ignition sources. Building must be fire-resistant.22

Incompatibilities: Fuels and organic materials (creates an explosive mixture). Acids (releases toxic nitrogen oxide fumes). Chlorates, metal powders, sulfur (sensitise to detonation). Never mix with diesel fuel unless under controlled conditions for authorised blasting.

First aid: Ingestion: give water, seek medical attention. Skin/eyes: wash with water.

Fire response: Do not fight ammonium nitrate fires in enclosed spaces or if detonation is possible — evacuate. If fire is small and in early stages: flood with large quantities of water. Do not use dry chemical or foam (ineffective on AN). Evacuate to at least 500 metres if large quantities are involved and fire is established.23

Spill response: Sweep up dry. Keep away from fuels and combustibles. Wash area with water.

PPE: Gloves, safety glasses. Respirator with particulate filter if dusty conditions.

3.4 2,4-D Herbicide (various NZ brands)

GHS Classification: Acute toxicity (Category 4 oral), Serious eye damage (Category 1), Aquatic toxicity (Category 1). Signal word: WARNING.24

Key hazards: Moderate acute toxicity. Severe eye irritant. Harmful if swallowed. Toxic to aquatic organisms.25

Storage: Original containers, cool dry area. Separate from food, feed, and fertilisers.

Incompatibilities: Strong bases and oxidisers.

First aid: Eyes: flush 15 minutes with water. Skin: wash with soap and water. Ingestion: do not induce vomiting; seek medical attention.

Fire response: Water spray, dry chemical, foam. Produces toxic fumes (hydrogen chloride) when burning.

Spill response: Absorb with earth or vermiculite. Prevent entry to waterways.

PPE: Chemical-resistant gloves, goggles, long sleeves. Respirator if spraying.

INDUSTRIAL CHEMICALS

3.5 Sulfuric Acid (Battery Acid, various industrial grades)

GHS Classification: Corrosive (Category 1A), Acute toxicity (Category 4 inhalation). Signal word: DANGER.

Key hazards: Severely corrosive to skin, eyes, and respiratory tract. Concentrated sulfuric acid causes immediate deep burns. Dilute acid (as in lead-acid batteries, ~30–40%) causes slower but still serious burns. Reacts violently with water if concentrated acid is added to water (exothermic — always add acid to water, never water to acid). Fumes in humid air.26

Storage: Acid-resistant containers (glass, HDPE, or PVC-lined steel). Separate from bases, oxidisers, metals, organic materials. Secondary containment (bunding) to contain spills. Ventilated area.

Incompatibilities: Water (violent exothermic reaction if added incorrectly). Bases (neutralisation releases heat). Most metals (generates hydrogen gas — explosive). Organic materials (charring, fire risk). Chlorates and permanganates (fire/explosion).

First aid: Skin: immediately flush with large volumes of water for at least 20 minutes. Remove contaminated clothing while flushing. Eyes: flush with water for at least 30 minutes, holding eyelids open. Ingestion: do not induce vomiting; give water or milk; seek medical care urgently. Burns from concentrated sulfuric acid are medical emergencies.

Fire response: Not flammable itself but reacts with many materials to produce heat and flammable hydrogen gas. Use water spray to cool containers. Do not use dry chemical (some formulations react with acid).

Spill response: Neutralise small spills with soda ash (sodium carbonate) or lime, then flush with water. Large spills: contain with earth bunding, pump into acid-resistant containers. Full PPE required.

PPE: Acid-resistant gloves (neoprene or butyl rubber), full face shield, chemical splash goggles, acid-resistant apron or suit. Respiratory protection if fumes present.

3.6 Sodium Hydroxide (Caustic Soda, Lye)

GHS Classification: Corrosive (Category 1A). Signal word: DANGER.

Key hazards: Severely corrosive. Dissolves skin and tissue on contact. Causes permanent eye damage. Solid NaOH absorbs moisture from air and generates heat when dissolving in water. Used in soap-making (Doc #37), biodiesel production (Doc #57), and water treatment.27 Note: sodium hydroxide has no role in traditional harakeke (flax) fibre processing — muka extraction uses water retting and scraping, not alkaline chemicals. Where sodium hydroxide is being used in improvised fibre-processing contexts, treat it as a separate industrial chemical operation requiring full corrosive-handling PPE, not as an extension of traditional practice.

Storage: Sealed containers (HDPE, steel). Keep dry — absorbs moisture and CO2 from air, degrading over time. Separate from acids, aluminium, zinc, tin (reacts to produce hydrogen gas).

Incompatibilities: Acids (violent exothermic neutralisation). Aluminium, zinc, and tin (generates hydrogen gas). Water added to solid NaOH generates significant heat.

First aid: Skin: flush with water for at least 20 minutes. Eyes: flush with water for at least 30 minutes — caustic burns to the eyes are particularly serious and can cause blindness. Ingestion: do not induce vomiting; give water or milk; seek medical care urgently.

Fire response: Not flammable. Use water spray if NaOH is involved in a fire with other materials. Do not allow water to pool in contact with solid NaOH (exothermic dissolution).

Spill response: Sweep up solid with dry shovel. Neutralise with weak acid (vinegar, dilute citric acid) for small spills, or contain with earth and collect.

PPE: Chemical-resistant gloves (neoprene or butyl rubber), full face shield, chemical splash goggles, protective clothing.

3.7 Acetylene (Welding Gas)

GHS Classification: Flammable gas (Category 1), Gas under pressure (dissolved gas). Signal word: DANGER.

Key hazards: Extremely flammable. Burns with a very hot flame (used for oxy-acetylene welding and cutting). Can decompose explosively at pressures above approximately 200 kPa, even without air or oxygen present. Stored dissolved in acetone within a porous filler inside the cylinder. Cylinders are particularly dangerous in fires — heat can cause explosive decomposition.28

Storage: Upright, secured from falling. At least 6 metres from oxygen cylinders (or separated by a fire-resistant barrier). Cool, well-ventilated area away from ignition sources. Never in enclosed, below-grade, or poorly ventilated spaces.

Incompatibilities: Oxygen (combustion). Copper, silver, mercury (forms shock-sensitive acetylides — never use copper fittings with acetylene). Halogens.

First aid: Asphyxiant at high concentrations. Move to fresh air. If burns from flame: treat as thermal burns.

Fire response: If cylinder is not involved: shut off gas supply if safe to do so, then extinguish with dry chemical or CO2. If cylinder is exposed to fire: evacuate the area (minimum 100 metres). Cool cylinder with water from a safe distance if possible, but do not approach a heated acetylene cylinder — it can explode hours after heating, even if the fire is out.29

Spill response (gas leak): Eliminate ignition sources. Ventilate area. Shut off supply if safe. Evacuate if leak cannot be controlled.

PPE: No special PPE for gas handling beyond standard workshop safety (gloves, safety glasses). For welding: full welding PPE (Doc #91).

3.8 Chlorine Gas (Water Treatment)

GHS Classification: Oxidising gas (Category 1), Acute toxicity (Category 2 inhalation), Corrosive (Category 1A), Aquatic toxicity (Category 1). Signal word: DANGER.

Key hazards: Highly toxic by inhalation. Corrosive to respiratory tract, skin, and eyes. Heavier than air — accumulates in low-lying areas and enclosed spaces. Detectable by odour at approximately 0.5 ppm. Irritating at 1–3 ppm. Dangerous at 10+ ppm. Potentially lethal at 100+ ppm within minutes. Used for water disinfection at many NZ treatment plants.30

Storage: Chlorine cylinders stored upright, secured, in dedicated well-ventilated rooms with gas detection. Separate from ammonia (forms toxic chloramines), hydrogen, acetylene, and organic materials. Cylinder rooms should have forced ventilation exhausting at floor level (Cl2 is heavier than air).

Incompatibilities: Ammonia (toxic chloramine gas). Hydrogen (explosive). Organic materials (vigorous oxidation). Many metals when wet (corrosion and hydrogen generation).

First aid: Move victim to fresh air immediately. Remove contaminated clothing. Flush eyes and skin with water. Monitor breathing — pulmonary oedema may develop hours after exposure. There is no specific antidote. Oxygen administration and supportive care. Seek medical attention urgently even if initial symptoms seem mild.31

Fire response: Not flammable but supports combustion. Do not use water on chlorine leaks (forms corrosive hypochlorous acid). Shut off supply if safe. Evacuate downwind.

Spill response (gas release): Evacuate area. Approach from upwind and uphill. Establish exclusion zone (minimum 100 metres for small release, more for large). Contain vapour cloud with water fog if possible (do not use water jets). Trained hazmat responders only.

PPE: Self-contained breathing apparatus (SCBA) for any response to a chlorine release. Chemical suit for splash protection. Standard chlorine gas detectors should be maintained at all water treatment plants.

3.9 Methanol (Wood Alcohol)

GHS Classification: Flammable liquid (Category 2), Acute toxicity (Category 1 oral, Category 3 dermal and inhalation). Signal word: DANGER.

Key hazards: Highly toxic by ingestion — as little as 10–15 mL can cause blindness, and 60–240 mL (approximately 1–2 mL/kg body weight) can be fatal, though individual susceptibility varies and smaller doses have caused death in some cases. Metabolised to formaldehyde and formic acid, which cause optic nerve damage and metabolic acidosis. Also toxic by skin absorption and inhalation. Flammable, with a nearly invisible flame in daylight. Relevant to recovery because methanol may be produced from wood gasification (Doc #111) and is used in biodiesel production (Doc #57).32

Storage: Flammable liquids cabinet or storage area. Away from ignition sources, oxidisers. Sealed containers to prevent evaporation and accidental ingestion. Clearly labelled “METHANOL — POISON — NOT FOR DRINKING” — accidental ingestion of methanol mistaken for ethanol is a well-documented cause of mass poisoning events.

Incompatibilities: Strong oxidisers. Strong acids (can form methyl esters). Alkali metals.

First aid: Ingestion: Medical emergency. Give ethanol if available (competitive inhibitor of methanol metabolism — approximately 1 mL/kg of 40% ethanol as loading dose, or IV ethanol solution). Fomepizole is the preferred antidote if available. Induce vomiting only within 30 minutes of ingestion and if the person is fully conscious. Seek medical care urgently. Skin: wash with soap and water. Eyes: flush 15 minutes. Inhalation: move to fresh air.33

Fire response: Alcohol-resistant foam, dry chemical, CO2. Water spray to cool containers. Methanol fires burn with near-invisible flame — approach cautiously.

Spill response: Eliminate ignition sources. Absorb with non-combustible material. Ventilate area.

PPE: Nitrile gloves (not latex — methanol permeates latex). Safety goggles. Organic vapour respirator in enclosed or poorly ventilated spaces. Impervious clothing for large-scale handling.

FUEL AND ENERGY CHEMICALS

3.10 Petrol (Gasoline, ULP91/95/98)

GHS Classification: Flammable liquid (Category 1), Acute toxicity (Category 4), Aspiration hazard (Category 1), Carcinogenicity (Category 1B — contains benzene). Signal word: DANGER.

Key hazards: Extremely flammable. Vapour is heavier than air and can travel long distances to ignition sources, then flash back to the source. Static discharge can ignite vapour. Toxic — contains benzene (carcinogenic) and other aromatics. Aspiration into lungs during vomiting is frequently fatal. NZ holds large volumes at fuel terminals and service stations.34

Storage: Approved fuel storage tanks and containers. Vented to prevent pressure buildup. Away from ignition sources. Secondary containment (bunding). No smoking within 15 metres.

Incompatibilities: All ignition sources. Strong oxidisers.

First aid: Ingestion: Do not induce vomiting (aspiration risk). Seek medical care. Skin: wash with soap and water. Eyes: flush 15 minutes. Inhalation: move to fresh air.

Fire response: Dry chemical, foam, CO2. Do not use water jets (spreads burning fuel). Water spray to cool adjacent tanks and structures. A major fuel terminal fire should be treated as an evacuation event, not a firefighting event, unless trained firefighters with foam capability are available.

Spill response: Eliminate all ignition sources. Contain with earth bunding. Do not flush into drains or waterways. Absorb with dry earth or commercial absorbent.

PPE: Nitrile gloves, safety glasses. Organic vapour respirator if significant vapour concentration. Anti-static clothing and grounding for bulk transfer.

3.11 LPG (Liquefied Petroleum Gas — Propane/Butane Mix)

GHS Classification: Flammable gas (Category 1), Gas under pressure (liquefied gas). Signal word: DANGER.

Key hazards: Extremely flammable. Heavier than air — accumulates in low-lying areas, drains, basements. Can cause asphyxiation in enclosed spaces by displacing oxygen. A cylinder or tank exposed to fire can undergo BLEVE (boiling liquid expanding vapour explosion) with devastating blast and fireball. Common throughout NZ for cooking, heating, and rural energy.35

Storage: Outdoors or in very well-ventilated areas. Cylinders upright, secured from falling. Away from ignition sources, drains, and below-grade areas. At least 3 metres from buildings (domestic), more for bulk storage.

Incompatibilities: All ignition sources. Oxidisers.

First aid: Vapour inhalation: move to fresh air. Liquid contact causes cold burns (cryogenic injury): treat as frostbite — warm gradually, do not rub. If ignited: treat thermal burns.

Fire response: Shut off gas supply if safe. If supply cannot be shut off, let the fire burn while cooling surrounding structures and cylinders with water spray. Do not extinguish a gas fire without shutting off the supply — unburned gas can accumulate and explode. If a cylinder is exposed to fire and cannot be cooled: evacuate at least 300 metres and do not approach until fully cool.36

Spill response (gas leak): Eliminate ignition sources. Evacuate area. Ventilate. Shut off supply if safe. Beware of accumulation in low points.

PPE: No special PPE for normal handling. SCBA for response to large leaks in enclosed areas.

3.12 Diesel Fuel

GHS Classification: Flammable liquid (Category 3), Acute toxicity (Category 4), Aspiration hazard (Category 1), Carcinogenicity (Category 2). Signal word: WARNING.

Key hazards: Less volatile than petrol (flash point approximately 52–96°C depending on grade, versus approximately -43°C for petrol), so vapour ignition risk is lower in normal conditions. However, diesel mist or spray is readily ignitable. Prolonged skin contact causes dermatitis. Contains PAHs (probable carcinogens). Aspiration risk if swallowed and vomited. Large volumes stored at NZ farms and depots.37

Storage: Approved fuel tanks with bunding. Away from ignition sources. Outdoor storage preferred.

Incompatibilities: Strong oxidisers. Ignition sources (particularly for mist or heated diesel).

First aid: Skin: wash with soap and water; remove contaminated clothing. Ingestion: do not induce vomiting; seek medical attention. Eyes: flush 15 minutes.

Fire response: Foam, dry chemical, CO2. Water spray to cool tanks. Do not use water jets on burning diesel pool (spreads fire).

Spill response: Contain with earth bunding. Prevent entry to waterways. Absorb with commercial absorbent or dry earth.

PPE: Nitrile gloves for routine handling. Impervious clothing for large-scale transfer. Organic vapour respirator in enclosed spaces.

MEDICAL AND PHARMACEUTICAL

3.13 Diethyl Ether (Anaesthetic Ether)

GHS Classification: Flammable liquid (Category 1), Acute toxicity (Category 4). Signal word: DANGER.

Key hazards: Extremely flammable — flash point -45°C. Vapour is heavier than air and highly prone to finding ignition sources. Forms explosive peroxides on storage when exposed to air and light (peroxides can detonate on concentration, heat, or friction). Historically used as an anaesthetic; may be produced locally from ethanol and sulfuric acid (Doc #118). CNS depressant at high concentrations.38

Storage: Sealed containers in explosion-proof storage. Cool, dark, well-ventilated. Away from all ignition sources. Check regularly for peroxide formation (test with potassium iodide paper — brown discolouration indicates peroxides). Do not open or distil ether that may contain peroxides without first testing and destroying peroxides (wash with acidified ferrous sulfate solution).39

Incompatibilities: Oxidisers (violent reaction). Halogens. Strong acids. Peroxide formation catalysed by exposure to air and UV light.

First aid: Inhalation: move to fresh air; monitor consciousness and breathing. Skin: wash with soap and water. Eyes: flush 15 minutes.

Fire response: CO2, dry chemical, alcohol-resistant foam. Water spray to cool containers. Do not use water jets (spreads burning ether). Evacuate if fire is near stored peroxide-containing ether.

Spill response: Eliminate all ignition sources. Ventilate area. Absorb with non-combustible material. Do not allow to enter drains.

PPE: Organic vapour respirator, nitrile gloves, safety goggles. No static-generating clothing.

3.14 Ethanol (Alcohol, surgical spirit, antiseptic)

GHS Classification: Flammable liquid (Category 2), Acute toxicity (Category 4 oral — at high doses), Serious eye irritation (Category 2A). Signal word: DANGER (for flammability).

Key hazards: Flammable — flash point 13°C. Vapour can travel to ignition sources. Relevant to recovery as antiseptic, solvent, fuel additive, and anaesthetic precursor (Doc #51). Burns with a nearly invisible blue flame. At concentrations of 60–90%, effective as a skin antiseptic; antimicrobial activity declines sharply below 60% and above 90% (higher concentrations evaporate before penetrating cell membranes).40

Storage: Flammable liquids storage. Sealed containers. Away from ignition sources and oxidisers.

Incompatibilities: Strong oxidisers (chromic acid, potassium permanganate, hydrogen peroxide — fire risk). Concentrated acids.

First aid: Ingestion: if large quantity, supportive care and monitoring. Skin: wash with water. Eyes: flush 15 minutes.

Fire response: Alcohol-resistant foam, dry chemical, CO2. Water spray to cool containers.

Spill response: Eliminate ignition sources. Absorb with non-combustible material. Ventilate enclosed areas.

PPE: Safety glasses, nitrile gloves for routine handling.

HOUSEHOLD CHEMICALS

3.15 Sodium Hypochlorite (Bleach — Janola, White King)

GHS Classification: Corrosive (Category 1), Acute toxicity (Category 4), Aquatic toxicity (Category 1). Signal word: DANGER.

Key hazards: Corrosive to skin and eyes. Releases chlorine gas if mixed with acids or ammonia-containing products — this is one of the most common dangerous household chemical reactions in NZ.41 Degrades over time, especially in heat and light, losing disinfecting strength — a 5% solution stored at ambient temperature loses approximately 10–20% of available chlorine per year, faster in heat and sunlight.42 Relevant as water disinfectant and surface sanitiser.

Storage: Cool, dark area. HDPE containers (corrodes metals). Away from acids, ammonia products, and organic materials.

Incompatibilities: Acids (releases chlorine gas — potentially lethal in enclosed spaces). Ammonia and ammonia-containing cleaners (releases toxic chloramine gas). Hydrogen peroxide. Organic materials (fire risk with concentrated solutions).

First aid: Skin: flush with water 15 minutes. Eyes: flush with water 30 minutes — seek medical attention. Ingestion: do not induce vomiting; give water or milk. If chlorine gas exposure from mixing: move to fresh air; seek medical care.

Fire response: Not flammable. Use water spray if involved in fire with other materials.

Spill response: Ventilate area. Flush small spills with large volumes of water. Contain large spills and neutralise with sodium thiosulfate solution.

PPE: Rubber gloves, safety glasses. Apron for large quantities.

3.16 Ammonia (Ammonium Hydroxide, household cleaners, refrigeration)

GHS Classification: Acute toxicity (Category 3 inhalation), Corrosive (Category 1A), Aquatic toxicity (Category 1). For anhydrous ammonia: also Flammable gas (Category 2), Gas under pressure. Signal word: DANGER.

Key hazards: Highly toxic by inhalation (IDLH: 300 ppm).43 Severely corrosive to eyes and respiratory tract. Anhydrous ammonia used in industrial refrigeration (Doc #40) is stored under pressure and releases as a dense, toxic gas cloud if containment fails. Household-strength ammonia (5–10% solution) is less dangerous but still a respiratory and eye hazard, especially in enclosed spaces. Never mix with bleach — produces toxic chloramine gas.

Storage: Ventilated area. Anhydrous ammonia: dedicated pressurised storage with engineered safety systems. Aqueous ammonia: sealed containers, away from acids, oxidisers, and hypochlorites.

Incompatibilities: Hypochlorites (bleach — toxic chloramine). Strong acids. Halogens. Mercury. Copper and brass (corroded by ammonia).

First aid: Inhalation: move to fresh air immediately. Monitor for delayed pulmonary oedema. Eyes: flush for at least 30 minutes — ammonia eye burns are extremely serious. Skin: flush with water 20 minutes.

Fire response: Anhydrous ammonia is mildly flammable at high concentrations (15–28% in air). Use water spray to absorb vapour. Evacuate downwind.

Spill response: Evacuate area. Approach from upwind. Water spray to absorb vapour (ammonia is highly soluble in water). Ventilate.

PPE: For household solutions: rubber gloves, safety glasses, ventilation. For anhydrous ammonia: SCBA, chemical suit.

PROCESS AND GEOTHERMAL CHEMICALS

3.17 Hydrogen Sulfide (H2S, Geothermal Gas, Sewer Gas)

GHS Classification: Flammable gas (Category 1), Acute toxicity (Category 1 inhalation), Aquatic toxicity (Category 1). Signal word: DANGER.

Key hazards: Extremely toxic by inhalation. IDLH: 50 ppm. 100+ ppm causes olfactory fatigue (loss of warning odour). 500+ ppm can cause rapid loss of consciousness and death within minutes. Heavier than air — accumulates in pits, basements, geothermal depressions, and confined spaces. Flammable and explosive at 4.3–46% in air. Encountered at geothermal power stations, geothermal areas, sewage systems, and around decaying organic matter. A particular NZ risk due to the Taupo Volcanic Zone and geothermal industry.44

Storage: Not stored intentionally in most NZ applications. Encountered as a process gas at geothermal plants and as a natural emission.

Incompatibilities: Strong oxidisers. Metals (corrodes many metals, particularly copper and silver).

First aid: Move victim to fresh air immediately. If breathing has stopped, begin rescue breathing (use barrier device — rescuer exposure risk). Administer oxygen if available. Casualties in H2S environments frequently result in rescuer deaths — do not enter without SCBA. Seek medical care urgently.

Fire response: Shut off gas supply if safe. Dry chemical, CO2. Water spray to cool and disperse gas. Do not extinguish if leak cannot be stopped.

Spill response (gas release): Evacuate area immediately, moving upwind and uphill. Establish exclusion zone. Ventilate. Only trained personnel with SCBA should enter the area.

PPE: SCBA (not cartridge respirators — H2S at high concentration overwhelms cartridge capacity). H2S personal gas monitors for anyone working in geothermal areas or confined spaces. Bump-test and calibrate monitors regularly.

3.18 Calcium Hypochlorite (Pool Chlorine, HTH, granular chlorine)

GHS Classification: Oxidiser (Category 2), Acute toxicity (Category 4 oral), Corrosive (Category 1), Aquatic toxicity (Category 1). Signal word: DANGER.

Key hazards: Strong oxidiser. Reacts violently with organic materials, oils, solvents, and many other chemicals. Can cause fire or explosion if contaminated. Releases chlorine gas when wet or when mixed with acids. Used for water treatment, pool sanitation, and potentially as a disinfectant in post-event water systems (Doc #48).45

Storage: Cool, dry, well-ventilated dedicated storage. Separate from all organic materials, acids, ammonia, fuels, and other oxidisers. Do not store with sodium hypochlorite (liquid bleach) — contamination risk. Keep containers sealed and dry. Even moisture from humidity can cause slow chlorine release in a sealed storage area.

Incompatibilities: Organic materials (fire/explosion). Acids (chlorine gas release). Ammonia (toxic chloramines). Reducing agents. Other oxidisers. Most metals when wet.

First aid: Skin: flush with water 15 minutes. Eyes: flush with water 30 minutes — seek medical attention. Ingestion: give water, do not induce vomiting. Inhalation of chlorine gas from product: move to fresh air.

Fire response: Flood with water. An oxidiser fire involving calcium hypochlorite can be extremely intense — evacuate if fire is established and supply cannot be removed.

Spill response: Sweep up dry (avoid generating dust). Keep away from organic materials and combustibles. Do not return spilled product to the original container (contamination risk).

PPE: Chemical-resistant gloves, safety goggles, dust mask or respirator with chlorine cartridge. Apron for large quantities.

4. PPE AVAILABILITY AND DEPLETION

The PPE requirements listed for each chemical above assume access to modern protective equipment — nitrile gloves, chemical splash goggles, organic vapour cartridge respirators, SCBA units, and chemical-resistant suits. All of these are imported products that NZ does not manufacture domestically. Existing stocks will deplete over 1–5 years depending on usage rates and storage conditions; rubber and nitrile degrade in storage even without use.46

Improvised substitutes perform significantly worse than purpose-built PPE. Leather gloves offer some splash protection against dilute corrosives but are permeable to organic solvents and provide no protection against concentrated acids. Cloth face coverings reduce dust inhalation but provide no protection against chemical vapours or toxic gases. Improvised goggles (e.g., clear plastic sheet sealed to the face) reduce but do not eliminate splash risk. There is no practical improvised substitute for SCBA — operations requiring SCBA (chlorine leak response, H2S confined-space entry) cannot be safely conducted once SCBA units and air cylinders are exhausted.

Planning implications: The national asset census (Doc #8) should inventory PPE stocks nationally. High-risk facilities (water treatment plants using chlorine gas, geothermal stations) should receive priority allocation of remaining SCBA units and cartridge respirators. As PPE stocks decline, some chemical handling operations that were safe with proper PPE will need to be modified — for example, switching from chlorine gas to sodium hypochlorite for water disinfection reduces PPE requirements from SCBA to basic splash protection (Doc #48).

5. CHEMICAL STORAGE COMPATIBILITY MATRIX

The following matrix summarises which categories of chemicals must be stored separately. An “X” indicates the pair must be physically separated (minimum 3 metres, or in separate rooms/buildings for bulk storage). This is the single most important table in this document — most chemical incidents arise from incompatible storage.

Acids Bases Oxidisers Flam. Liquids Flam. Gases Toxics Compressed Gas
Acids — X X X X * *
Bases X — * * * * *
Oxidisers X * — X X * *
Flam. Liquids X * X — X * *
Flam. Gases X * X X — * X
Toxics * * * * * — *
Compressed Gas * * * * X * —

X = Must be separated. * = Check specific chemical incompatibilities; separation may be required.

The most dangerous common pairings in NZ settings:

  • Ammonium nitrate + diesel fuel or any organic material (explosive)
  • Chlorine or hypochlorite + ammonia (toxic chloramine gas)
  • Chlorine or hypochlorite + acid (chlorine gas release)
  • Calcium hypochlorite + any organic material (fire/explosion)
  • Sulfuric acid + water (exothermic, if acid is added to water incorrectly)
  • Acetylene + copper fittings (shock-sensitive acetylides)
  • Any flammable vapour + any ignition source in enclosed space

6. CRITICAL UNCERTAINTIES

Uncertainty Impact Mitigation
Actual inventory of agricultural chemicals on NZ farms Unknown which farms hold what quantities of which products National asset census (Doc #8) should include chemical stores
Condition of stored chemicals (degraded containers, leaks) Degraded containers increase spill and exposure risk Inspection program for major stores; immediate attention to any signs of leakage
Availability of antidotes (atropine, fomepizole, calcium gluconate) Without antidotes, organophosphate and other poisonings become more lethal Inventory and strategically distribute antidote stocks
Training level of people inheriting chemical management roles Undertrained handlers are the primary risk factor for chemical incidents Distribute this reference widely; pair untrained handlers with experienced personnel
Geothermal H2S monitoring equipment calibration and battery life Monitors fail or lose calibration; workers enter H2S areas without warning Maintain calibration standards; centralise monitor battery stocks
PPE stock depletion Nitrile gloves, respirator cartridges, SCBA air cylinders, and chemical suits are all imported; stocks deplete over 1–5 years Inventory nationally (Doc #8); prioritise allocation to highest-risk sites; plan transition to less PPE-intensive chemical processes where feasible
Completeness of this reference 18 entries do not cover all chemicals in NZ Generate and print full reference (300–400 pages) while AI facility is operational

7. CROSS-REFERENCES

Document Relevance
Doc #1 — Stockpile Strategy Requisition framework for chemical stores
Doc #156 — Skills Census Establishing what chemicals exist and where
Doc #37 — Soap and Hygiene Uses sodium hydroxide (Section 3.6)
Doc #40 — Refrigeration Transition Uses ammonia (Section 3.16)
Doc #48 — Water Treatment Uses chlorine and hypochlorite (Sections 3.8, 3.15, 3.18)
Doc #51 — Ethanol and Vinegar Ethanol production and safety (Section 3.14)
Doc #57 — Biodiesel and Alcohol Uses methanol and sodium hydroxide
Doc #66 — Geothermal Maintenance H2S exposure management (Section 3.17)
Doc #113 — Sulfuric Acid Production Production and handling (Section 3.5)
Doc #116 — Pharmaceutical Rationing Antidote stock management
Doc #118 — Anaesthesia Alternatives Diethyl ether production and safety (Section 3.13)
Doc #129 — AI Inference Facility Generation of full chemical safety reference
Doc #160 — Heritage Skills Preservation Traditional knowledge systems and partnership frameworks for recovery operations

FOOTNOTES

  1. Environmental Protection Authority (EPA) New Zealand, Hazardous Substances classifications under the Hazardous Substances and New Organisms Act 1996 (HSNO Act) and the Health and Safety at Work (Hazardous Substances) Regulations 2017. Chemical classification database available at https://www.epa.govt.nz/database-search/hazardous-substan... — NZ’s system is broadly aligned with GHS but has NZ-specific approval conditions and controls.↩︎

  2. United Nations, Globally Harmonized System of Classification and Labelling of Chemicals (GHS), 7th revised edition, 2017. https://unece.org/transport/standards/transport/dangerous... — The international standard for chemical hazard classification, pictograms, and Safety Data Sheets.↩︎

  3. GHS pictograms and signal words: “DANGER” indicates more severe hazard categories; “WARNING” indicates less severe. The system uses standardised pictograms (flame, skull and crossbones, corrosion, exclamation mark, health hazard, environment) that should be reproduced on all chemical labels and in the full printed reference.↩︎

  4. Ballance Agri-Nutrients and Ravensdown are NZ’s two major fertiliser companies, with distribution depots throughout the country. Ballance operates the Kapuni ammonia-urea plant in Taranaki. Ravensdown imports and distributes superphosphate, DAP, and other fertilisers. Individual farm stores may hold hundreds of kilograms to several tonnes of fertiliser products plus pesticides and herbicides. Source: Company websites; MPI NZ agricultural sector data.↩︎

  5. GHS pictograms and signal words: “DANGER” indicates more severe hazard categories; “WARNING” indicates less severe. The system uses standardised pictograms (flame, skull and crossbones, corrosion, exclamation mark, health hazard, environment) that should be reproduced on all chemical labels and in the full printed reference.↩︎

  6. Environmental Protection Authority (EPA) New Zealand, Hazardous Substances classifications under the Hazardous Substances and New Organisms Act 1996 (HSNO Act) and the Health and Safety at Work (Hazardous Substances) Regulations 2017. Chemical classification database available at https://www.epa.govt.nz/database-search/hazardous-substan... — NZ’s system is broadly aligned with GHS but has NZ-specific approval conditions and controls.↩︎

  7. United Nations, Globally Harmonized System of Classification and Labelling of Chemicals (GHS), 7th revised edition, 2017. https://unece.org/transport/standards/transport/dangerous... — The international standard for chemical hazard classification, pictograms, and Safety Data Sheets.↩︎

  8. GHS pictograms and signal words: “DANGER” indicates more severe hazard categories; “WARNING” indicates less severe. The system uses standardised pictograms (flame, skull and crossbones, corrosion, exclamation mark, health hazard, environment) that should be reproduced on all chemical labels and in the full printed reference.↩︎

  9. Environmental Protection Authority (EPA) New Zealand, Hazardous Substances classifications under the Hazardous Substances and New Organisms Act 1996 (HSNO Act) and the Health and Safety at Work (Hazardous Substances) Regulations 2017. Chemical classification database available at https://www.epa.govt.nz/database-search/hazardous-substan... — NZ’s system is broadly aligned with GHS but has NZ-specific approval conditions and controls.↩︎

  10. Ballance Agri-Nutrients and Ravensdown are NZ’s two major fertiliser companies, with distribution depots throughout the country. Ballance operates the Kapuni ammonia-urea plant in Taranaki. Ravensdown imports and distributes superphosphate, DAP, and other fertilisers. Individual farm stores may hold hundreds of kilograms to several tonnes of fertiliser products plus pesticides and herbicides. Source: Company websites; MPI NZ agricultural sector data.↩︎

  11. Ammonium nitrate safety: the Beirut explosion of 4 August 2020 (2,750 tonnes of ammonium nitrate improperly stored for six years) killed 218 people and caused approximately US$15 billion in damage. Earlier incidents include Texas City (1947, 2,300 dead), Oppau (1921, 561 dead), and Toulouse (2001, 31 dead). In NZ, ammonium nitrate is regulated under the HSNO Act with specific storage requirements. Source: US Chemical Safety Board investigation reports; NZ EPA guidance on ammonium nitrate storage.↩︎

  12. Hydrogen sulfide in NZ geothermal areas: Rotorua has ambient H2S concentrations of 20–60 ppb with occasional spikes above 100 ppb in residential areas. Geothermal power stations handle H2S at concentrations of 500–5,000 ppm in geothermal steam. WorkSafe NZ workplace exposure standard (WES) for H2S is 5 ppm (8-hour TWA) and 10 ppm (STEL). IDLH is 50 ppm (NIOSH). Source: GNS Science, “Hydrogen Sulfide in Rotorua”; WorkSafe NZ WES database; NIOSH Pocket Guide to Chemical Hazards.↩︎

  13. Hydrogen sulfide in NZ geothermal areas: Rotorua has ambient H2S concentrations of 20–60 ppb with occasional spikes above 100 ppb in residential areas. Geothermal power stations handle H2S at concentrations of 500–5,000 ppm in geothermal steam. WorkSafe NZ workplace exposure standard (WES) for H2S is 5 ppm (8-hour TWA) and 10 ppm (STEL). IDLH is 50 ppm (NIOSH). Source: GNS Science, “Hydrogen Sulfide in Rotorua”; WorkSafe NZ WES database; NIOSH Pocket Guide to Chemical Hazards.↩︎

  14. Mātauranga Māori sources for chemical and hazard knowledge: karaka detoxification — Best, E., Forest Lore of the Maori (Government Printer, Wellington, 1942); Brooker, S.G., Cambie, R.C., and Cooper, R.C., New Zealand Medicinal Plants (Heinemann, Auckland, 1987). Tutu and tutin poisoning — ESR NZ, “Tutin in Honey,” food safety advisory, 2008; Minnear, M., “Tutin toxicity in New Zealand honey,” New Zealand Medical Journal, 2009. Geothermal tapu — Te Ara, the Encyclopaedia of New Zealand, “Geothermal Energy and Māori”; Marsden, M., The Woven Universe: Selected Writings of Rev. Māori Marsden (Estate of Rev. Māori Marsden, 2003). Kaitiakitanga — Mead, H.M., Tikanga Māori: Living by Māori Values (Huia Publishers, Wellington, 2003). Doc #160 (Heritage Skills Preservation) provides the broader integration framework for mātauranga Māori in recovery operations.↩︎

  15. NZ fuel supply infrastructure: Marsden Point refinery ceased refining operations in March 2022 and now operates as the Marsden Point Fuel Terminal (import terminal). NZ’s fuel supply is now entirely imported as refined product. Domestic fuel storage capacity includes the terminal, regional storage at Wiri (Auckland), Woolston (Christchurch), and other regional terminals, plus approximately 1,200 service stations. Source: Channel Infrastructure NZ; MBIE NZ energy statistics.↩︎

  16. NZ water treatment: approximately 70% of NZ reticulated water supplies use chlorination for disinfection. Chlorine gas is used at larger plants; sodium or calcium hypochlorite at smaller plants. Source: Ministry of Health NZ, Drinking-water Standards for New Zealand, 2022; Water NZ.↩︎

  17. Mātauranga Māori sources for chemical and hazard knowledge: karaka detoxification — Best, E., Forest Lore of the Maori (Government Printer, Wellington, 1942); Brooker, S.G., Cambie, R.C., and Cooper, R.C., New Zealand Medicinal Plants (Heinemann, Auckland, 1987). Tutu and tutin poisoning — ESR NZ, “Tutin in Honey,” food safety advisory, 2008; Minnear, M., “Tutin toxicity in New Zealand honey,” New Zealand Medical Journal, 2009. Geothermal tapu — Te Ara, the Encyclopaedia of New Zealand, “Geothermal Energy and Māori”; Marsden, M., The Woven Universe: Selected Writings of Rev. Māori Marsden (Estate of Rev. Māori Marsden, 2003). Kaitiakitanga — Mead, H.M., Tikanga Māori: Living by Māori Values (Huia Publishers, Wellington, 2003). Doc #160 (Heritage Skills Preservation) provides the broader integration framework for mātauranga Māori in recovery operations.↩︎

  18. Mātauranga Māori sources for chemical and hazard knowledge: karaka detoxification — Best, E., Forest Lore of the Maori (Government Printer, Wellington, 1942); Brooker, S.G., Cambie, R.C., and Cooper, R.C., New Zealand Medicinal Plants (Heinemann, Auckland, 1987). Tutu and tutin poisoning — ESR NZ, “Tutin in Honey,” food safety advisory, 2008; Minnear, M., “Tutin toxicity in New Zealand honey,” New Zealand Medical Journal, 2009. Geothermal tapu — Te Ara, the Encyclopaedia of New Zealand, “Geothermal Energy and Māori”; Marsden, M., The Woven Universe: Selected Writings of Rev. Māori Marsden (Estate of Rev. Māori Marsden, 2003). Kaitiakitanga — Mead, H.M., Tikanga Māori: Living by Māori Values (Huia Publishers, Wellington, 2003). Doc #160 (Heritage Skills Preservation) provides the broader integration framework for mātauranga Māori in recovery operations.↩︎

  19. Organophosphate toxicity and treatment: organophosphates are irreversible acetylcholinesterase inhibitors. Symptoms follow the SLUDGE/BBB mnemonic: Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis / Bradycardia, Bronchospasm, Bronchorrhoea. Treatment: atropine (muscarinic antagonist) plus pralidoxime (cholinesterase reactivator). Source: Eddleston, M., et al., “Management of Acute Organophosphorus Pesticide Poisoning,” The Lancet, 2008; NZ National Poisons Centre guidance.↩︎

  20. Organophosphate toxicity and treatment: organophosphates are irreversible acetylcholinesterase inhibitors. Symptoms follow the SLUDGE/BBB mnemonic: Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis / Bradycardia, Bronchospasm, Bronchorrhoea. Treatment: atropine (muscarinic antagonist) plus pralidoxime (cholinesterase reactivator). Source: Eddleston, M., et al., “Management of Acute Organophosphorus Pesticide Poisoning,” The Lancet, 2008; NZ National Poisons Centre guidance.↩︎

  21. Ammonium nitrate safety: the Beirut explosion of 4 August 2020 (2,750 tonnes of ammonium nitrate improperly stored for six years) killed 218 people and caused approximately US$15 billion in damage. Earlier incidents include Texas City (1947, 2,300 dead), Oppau (1921, 561 dead), and Toulouse (2001, 31 dead). In NZ, ammonium nitrate is regulated under the HSNO Act with specific storage requirements. Source: US Chemical Safety Board investigation reports; NZ EPA guidance on ammonium nitrate storage.↩︎

  22. Ammonium nitrate safety: the Beirut explosion of 4 August 2020 (2,750 tonnes of ammonium nitrate improperly stored for six years) killed 218 people and caused approximately US$15 billion in damage. Earlier incidents include Texas City (1947, 2,300 dead), Oppau (1921, 561 dead), and Toulouse (2001, 31 dead). In NZ, ammonium nitrate is regulated under the HSNO Act with specific storage requirements. Source: US Chemical Safety Board investigation reports; NZ EPA guidance on ammonium nitrate storage.↩︎

  23. Ammonium nitrate safety: the Beirut explosion of 4 August 2020 (2,750 tonnes of ammonium nitrate improperly stored for six years) killed 218 people and caused approximately US$15 billion in damage. Earlier incidents include Texas City (1947, 2,300 dead), Oppau (1921, 561 dead), and Toulouse (2001, 31 dead). In NZ, ammonium nitrate is regulated under the HSNO Act with specific storage requirements. Source: US Chemical Safety Board investigation reports; NZ EPA guidance on ammonium nitrate storage.↩︎

  24. 2,4-D (2,4-dichlorophenoxyacetic acid) is widely used in NZ agriculture and amenity turf management. Classified under HSNO with approval conditions. NZ-specific trade names include Pasture Guardian, Nufarm 2,4-D, and various combination products. Source: NZ EPA Hazardous Substances database; Safety Data Sheets from NZ suppliers (Nufarm NZ, BASF NZ).↩︎

  25. 2,4-D (2,4-dichlorophenoxyacetic acid) is widely used in NZ agriculture and amenity turf management. Classified under HSNO with approval conditions. NZ-specific trade names include Pasture Guardian, Nufarm 2,4-D, and various combination products. Source: NZ EPA Hazardous Substances database; Safety Data Sheets from NZ suppliers (Nufarm NZ, BASF NZ).↩︎

  26. Sulfuric acid is the most widely used industrial chemical globally. In NZ, it is present in lead-acid batteries (dilute, ~30–40%), in water treatment (for pH adjustment), and in various industrial processes. The exothermic reaction when concentrated acid contacts water is one of the most common causes of laboratory and industrial acid burns. Source: Standard chemical safety references; NZ EPA hazardous substances database.↩︎

  27. Sodium hydroxide (NaOH) is used extensively in NZ for soap and detergent manufacturing, pulp and paper processing (Oji Fibre Solutions, Kinleith), water treatment pH adjustment, biodiesel production, and food processing (olive curing, cocoa processing). NZ imports sodium hydroxide and also produces it domestically via chlor-alkali electrolysis. Source: NZ EPA Hazardous Substances database; standard industrial chemistry references.↩︎

  28. Acetylene decomposition hazard: acetylene is thermodynamically unstable and can decompose explosively at pressures above approximately 200 kPa (~2 bar) even in the absence of oxygen. Cylinders use acetone as a solvent and porous filler to stabilise the gas. A heated cylinder can undergo delayed decomposition hours after the heat source is removed. Source: CGA pamphlet G-1, “Acetylene” (Compressed Gas Association); WorkSafe NZ guidance on gas cylinder safety.↩︎

  29. Acetylene decomposition hazard: acetylene is thermodynamically unstable and can decompose explosively at pressures above approximately 200 kPa (~2 bar) even in the absence of oxygen. Cylinders use acetone as a solvent and porous filler to stabilise the gas. A heated cylinder can undergo delayed decomposition hours after the heat source is removed. Source: CGA pamphlet G-1, “Acetylene” (Compressed Gas Association); WorkSafe NZ guidance on gas cylinder safety.↩︎

  30. NZ water treatment: approximately 70% of NZ reticulated water supplies use chlorination for disinfection. Chlorine gas is used at larger plants; sodium or calcium hypochlorite at smaller plants. Source: Ministry of Health NZ, Drinking-water Standards for New Zealand, 2022; Water NZ.↩︎

  31. NZ water treatment: approximately 70% of NZ reticulated water supplies use chlorination for disinfection. Chlorine gas is used at larger plants; sodium or calcium hypochlorite at smaller plants. Source: Ministry of Health NZ, Drinking-water Standards for New Zealand, 2022; Water NZ.↩︎

  32. Methanol toxicity: lethal dose in humans is approximately 1–2 mL/kg, though as little as 10 mL has caused blindness in some cases. Metabolism to formic acid via alcohol dehydrogenase is the primary toxic pathway; ethanol competes for the same enzyme and slows methanol metabolism, buying time for medical treatment. Fomepizole (4-methylpyrazole) is a more specific alcohol dehydrogenase inhibitor but is expensive and may be unavailable post-event. Source: Barceloux, D.G., et al., “American Academy of Clinical Toxicology Practice Guidelines on the Treatment of Methanol Poisoning,” Journal of Toxicology: Clinical Toxicology, 2002.↩︎

  33. Methanol toxicity: lethal dose in humans is approximately 1–2 mL/kg, though as little as 10 mL has caused blindness in some cases. Metabolism to formic acid via alcohol dehydrogenase is the primary toxic pathway; ethanol competes for the same enzyme and slows methanol metabolism, buying time for medical treatment. Fomepizole (4-methylpyrazole) is a more specific alcohol dehydrogenase inhibitor but is expensive and may be unavailable post-event. Source: Barceloux, D.G., et al., “American Academy of Clinical Toxicology Practice Guidelines on the Treatment of Methanol Poisoning,” Journal of Toxicology: Clinical Toxicology, 2002.↩︎

  34. NZ fuel supply infrastructure: Marsden Point refinery ceased refining operations in March 2022 and now operates as the Marsden Point Fuel Terminal (import terminal). NZ’s fuel supply is now entirely imported as refined product. Domestic fuel storage capacity includes the terminal, regional storage at Wiri (Auckland), Woolston (Christchurch), and other regional terminals, plus approximately 1,200 service stations. Source: Channel Infrastructure NZ; MBIE NZ energy statistics.↩︎

  35. BLEVE (Boiling Liquid Expanding Vapour Explosion): occurs when a pressurised vessel containing liquefied gas is heated by an external fire until the vessel wall fails. The rapid depressurisation vaporises the remaining liquid instantly, producing a massive fireball and blast wave. LPG BLEVEs have killed firefighters at distances of 100+ metres. NZ has experienced LPG incidents, and bulk LPG storage exists at depots and on farms throughout the country. Source: NFPA 58, “Liquefied Petroleum Gas Code”; WorkSafe NZ dangerous goods guidance.↩︎

  36. BLEVE (Boiling Liquid Expanding Vapour Explosion): occurs when a pressurised vessel containing liquefied gas is heated by an external fire until the vessel wall fails. The rapid depressurisation vaporises the remaining liquid instantly, producing a massive fireball and blast wave. LPG BLEVEs have killed firefighters at distances of 100+ metres. NZ has experienced LPG incidents, and bulk LPG storage exists at depots and on farms throughout the country. Source: NFPA 58, “Liquefied Petroleum Gas Code”; WorkSafe NZ dangerous goods guidance.↩︎

  37. Diesel fuel properties: flash point varies by grade — standard automotive diesel (EN 590 equivalent, as sold in NZ) has a flash point of 52–96°C. Diesel contains polycyclic aromatic hydrocarbons (PAHs), classified as Group 2A (probably carcinogenic) by IARC. NZ on-farm diesel storage is common; the exact volume held nationally on farms is not publicly compiled but is estimated at tens of millions of litres across approximately 50,000 farms. Source: NZ EPA hazardous substances database; IARC Monographs Vol. 46; MBIE NZ energy statistics.↩︎

  38. Diethyl ether peroxide formation: ether exposed to air forms peroxides (primarily diethyl ether peroxide and ethylidene diperoxide) that are shock-sensitive and can detonate. Peroxide concentration increases with storage time and exposure to air and light. Testing with acidified potassium iodide solution is the standard field test. Peroxides can be destroyed by washing with acidified ferrous sulfate solution before distillation. Source: Clark, D.E., “Peroxides and Peroxide-Forming Compounds,” Chemical Health and Safety, 2001; standard laboratory safety references.↩︎

  39. Diethyl ether peroxide formation: ether exposed to air forms peroxides (primarily diethyl ether peroxide and ethylidene diperoxide) that are shock-sensitive and can detonate. Peroxide concentration increases with storage time and exposure to air and light. Testing with acidified potassium iodide solution is the standard field test. Peroxides can be destroyed by washing with acidified ferrous sulfate solution before distillation. Source: Clark, D.E., “Peroxides and Peroxide-Forming Compounds,” Chemical Health and Safety, 2001; standard laboratory safety references.↩︎

  40. Ethanol antimicrobial activity: the WHO recommends 60–80% ethanol for hand antisepsis. Concentrations above 90% are less effective because the rapid evaporation prevents sufficient contact time, and the denaturing of bacterial proteins requires some water to be present. Concentrations below 60% show markedly reduced bactericidal activity. Source: WHO, WHO Guidelines on Hand Hygiene in Health Care, 2009; McDonnell, G., and Russell, A.D., “Antiseptics and Disinfectants: Activity, Action, and Resistance,” Clinical Microbiology Reviews, 1999.↩︎

  41. Sodium hypochlorite degradation and hazard data: household bleach in NZ is typically sold at 3–5% available chlorine (Janola, White King). Degradation rate depends on temperature, concentration, pH, and light exposure. At 25°C, a 5% solution loses approximately 10–20% of available chlorine per year; degradation accelerates at higher temperatures. The mixing of bleach and acid (or bleach and ammonia) is a recurring cause of domestic chemical exposure incidents in NZ and internationally. Source: NZ National Poisons Centre annual reports; standard water chemistry references; manufacturer SDS.↩︎

  42. Sodium hypochlorite degradation and hazard data: household bleach in NZ is typically sold at 3–5% available chlorine (Janola, White King). Degradation rate depends on temperature, concentration, pH, and light exposure. At 25°C, a 5% solution loses approximately 10–20% of available chlorine per year; degradation accelerates at higher temperatures. The mixing of bleach and acid (or bleach and ammonia) is a recurring cause of domestic chemical exposure incidents in NZ and internationally. Source: NZ National Poisons Centre annual reports; standard water chemistry references; manufacturer SDS.↩︎

  43. Ammonia IDLH (Immediately Dangerous to Life or Health) concentration of 300 ppm is the NIOSH-established value. WorkSafe NZ workplace exposure standard (WES) for ammonia is 25 ppm (8-hour TWA) and 35 ppm (STEL). NZ has anhydrous ammonia in industrial refrigeration (cold stores, meat processing plants), the Kapuni ammonia-urea plant (Ballance Agri-Nutrients, Taranaki), and as household cleaning products. Source: NIOSH Pocket Guide to Chemical Hazards; WorkSafe NZ WES database.↩︎

  44. Hydrogen sulfide in NZ geothermal areas: Rotorua has ambient H2S concentrations of 20–60 ppb with occasional spikes above 100 ppb in residential areas. Geothermal power stations handle H2S at concentrations of 500–5,000 ppm in geothermal steam. WorkSafe NZ workplace exposure standard (WES) for H2S is 5 ppm (8-hour TWA) and 10 ppm (STEL). IDLH is 50 ppm (NIOSH). Source: GNS Science, “Hydrogen Sulfide in Rotorua”; WorkSafe NZ WES database; NIOSH Pocket Guide to Chemical Hazards.↩︎

  45. NZ water treatment: approximately 70% of NZ reticulated water supplies use chlorination for disinfection. Chlorine gas is used at larger plants; sodium or calcium hypochlorite at smaller plants. Source: Ministry of Health NZ, Drinking-water Standards for New Zealand, 2022; Water NZ.↩︎

  46. PPE shelf life: nitrile gloves degrade in storage over 3–5 years depending on conditions (heat, UV, and ozone accelerate degradation). Respirator cartridge filters have manufacturer-recommended shelf lives of 3–5 years unopened. SCBA air cylinders require hydrostatic testing every 5 years and valve inspection annually; composite cylinders have a 15-year service life. NZ does not manufacture any of these items domestically. Source: AS/NZS 1715:2009 (Selection, use and maintenance of respiratory protective equipment); manufacturer specifications for 3M, Draeger, and MSA PPE products; WorkSafe NZ PPE guidance.↩︎

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