Wood preservation facilities, ammoniacal copper zinc arsenate: chapter C, table 2


Table 2. Physical and Chemical Properties of Ammoniacal Copper Zinc Arsenate (ACZA) Solution

Identification

Common synonyms Chemonite, ACZA (Ammoniacal copper zinc arsenate)
Registrant in 2012

Lonza - Arch Wood Protection Canada Corp. (Mississauga, ON):

  • Chemonite Wood Preservative Solution

Transportation and storage information

Shipping state Liquid concentrate
Concentration (by weight, as oxides)

Concentrates, 22% including

  • copper or cupric oxide;
  • zinc oxide;
  • arsenic acid;
  • ammonia.
Storage temperature Ambient
Hoses Use PVC, rubber, polyethylene steel or stainless steel fittings only.
Venting No requirement
Containers/materials Plastic, steel or steel polylined
Classification Poisonous, corrosive liquid
Placards Class 6.1 P.G II (Check with Transport Canada)
Delivery format Bulk tank for concentrate

Physical and chemical properties

Physical state Liquid (20°C, 1 atm)
Vapour pressure (27ºC) 8% solution, 72 mm Hg
Solubility Freely soluble (water)
Concentration of work solutions Work solutions 0.5% to 10%
Floatability Mixes with water
Freezing point -3°C to -5°C
Flash point Not applicable
Explosive limits Mixtures of ammonia in air (16-25% by volume) in an enclosed space can ignite or explode if sparked or exposed to temperatures exceeding 650°C (1200°F) (see ammonia)
Colour Light blue
Odour Sharp, characteristic odour (50 ppm threshold)
pH 2% solution, 10.2; 8% solution, 12.0
Typical preservative retention in treated wood 4.0 to 30 kg/m3 treated wood

Hazard data

Fire

Extinguishing data Liquid is non-flammable. Most extinguishing agents can be used on fires involving ammonium hydroxide and arsenic acid.
Fire behaviour Liquid not flammable. Mixtures of ammonia and air can ignite or explode (see above). When exposed to fire, the liquid solution releases ammonia gas as well as copper, zinc and arsenic fumes.
Ignition temperature Not flammable as liquid; ammonia is flammable at 649°C.
Burning rate Not applicable

Reactivity

With water No reaction, soluble.
With common materials Copper, tin and zinc alloys are readily corroded. Reacts with acrolein, acrylic acid, chlorosulphonic acid, dimethyl sulphate, halogens, hydrochloric acid, hydrofluoric acid, nitric acid, sulphuric acid, oleum, propylene oxide and silver nitrate. Avoid contact with aluminium or zinc. Strong reducing conditions may produce arsine gas.
Stability Stable

Table 2.1. Physical and Chemical Properties of Ammonium Hydroxide (5)

Identification

Common synonyms Aqua ammonia, NH4OH
Anhydrous Ammonia
Ammonium hydrate
Ammonium solution
Ammonia water
United Nations (UN) number 2672
Manufacturers CF Industries Inc., Courtright, Ontario
Canadian Fertilizers Ltd., Medicine Hat, Alberta
Simplot Chemical Ltd., Brandon, Manitoba

Transportation and storage information

Shipping state Liquid
Concentration (by weight, as oxides) Grade A: 29.4% USP: 27-29%
B: 25% CP: 28%
C: 15%
Classification Poisonous, corrosive
Storage temperature Ambient
Hoses Use PVC, rubber, polyethylene steel or stainless steel fittings only.
Venting Provide scrubbing to meet air discharge regulatory limits.
Containers/materials

Totes, tank trucks, tank cars (steel or steel polylined). Use all iron or stainless steel pumps (no copper alloys, brass or bronze).

29% aqua ammonia liquid (bulk)

Placards Check with Transport Canada

Physical and chemical properties

Physical state Liquid (20°C, 1 atm.)
Vapour pressure

Ammonia - 10%
(0°C) - 31 mm Hg
(27°C) - 159 mm HG

Ammonia - 20%
(0°C) - 88 mm Hg
(27°C) - 310 mm HG

Ammonia - 30%
(0°C) - 238 mm Hg
(27°C) - 786 mm HG

Solubility Freely soluble (water)
Floatability Floats and mixes with water
Flash point Flammable as ammonia
Explosive limits Mixtures of ammonia in air (16-25% by volume) in an enclosed space can ignite or explode if sparked or exposed to temperatures exceeding 650°C (1200°F).
Colour Colourless
Odour Sharp, characteristic odour (50 ppm threshold)
Vapour density 0.6
Specific gravity 0.90 (15.5°C)

Hazard data

Fire

Extinguishing data Liquid is non-flammable. Most extinguishing agents can be used on fires involving ammonium hydroxide and arsenic acid.
Fire behaviour Liquid not flammable. Mixtures of ammonia and air can ignite or explode (see above). When exposed to fire, the liquid solution releases ammonia gas.
Ignition temperature Not flammable as liquid; ammonia is flammable at 649°C.
Burning rate Not applicable

Reactivity

With water No reaction, soluble
With common materials Copper, tin and zinc alloys are readily corroded. Reacts with acrolein, acrylic acid, chlorosulphonic acid, dimethyl sulphate, halogens, hydrochloric acid, hydrofluoric acid, nitric acid, sulphuric acid, oleum, propylene oxide and silver nitrate. Avoid contact with aluminium or zinc.
Stability Stable

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2017-09-22