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POTASSIUM ARSENATE ICSC: 1210
Date of Peer Review: March 1999

Potassium dihydrogen arsenate
Potassium arsenate, monobasic
Potassium acid arsenate
CAS # 7784-41-0 KH2AsO4
RTECS # CG1100000 Molecular mass: 180.0
UN # 1677
EC Index # 033-005-00-1
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST! AVOID ALL CONTACT! AVOID EXPOSURE OF (PREGNANT) WOMEN!
IN ALL CASES CONSULT A DOCTOR!
Inhalation Cough. Headache. Laboured breathing. Sore throat. Weakness. See Ingestion.
Closed system and ventilation.
Fresh air, rest. Refer for medical attention.
Skin Redness. Pain.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
Eyes Redness. Pain.
Face shield or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Abdominal pain. Burning sensation (behind breastbone and in the mouth). Diarrhoea. Dizziness. Headache. Shock or collapse. Vomiting.
Do not eat, drink, or smoke during work. Wash hands before eating.
Rinse mouth. Give a slurry of activated charcoal in water to drink. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Vacuum spilled material. Carefully collect remainder, then remove to safe place. Chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment.
Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs. Marine pollutant.
EU Classification
Symbol: T, N
R: 45-23/25-50/53
S: 53-45-60-61
Note: [A, E]
UN Classification
UN Hazard Class: 6.1
UN Pack Group: II
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-61GT5-II
Separated from acids, food and feedstuffs. Provision to contain effluent from fire extinguishing. Well closed.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK
POTASSIUM ARSENATE ICSC: 1210
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS OR WHITE CRYSTALS OR POWDER.

CHEMICAL DANGERS:
Upon heating, toxic fumes are formed. Reacts with acids to produce toxic arsine gas (see ICSC 0222). Attacks many metals in presence of water such as iron, aluminium and zinc, releasing toxic fumes of arsenic and arsine.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: (as As) 0.01 mg/m; A1 (confirmed human carcinogen); BEI issued; (ACGIH 2004).
MAK: Carcinogen category: 1; Germ cell mutagen group: 3A; (DFG 2004).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol, by ingestion.

INHALATION RISK:
Evaporation at 20C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes, the skin and the respiratory tract. The substance may cause effects on the gastrointestinal tract, cardiovascular system, central nervous system, kidneys, resulting in severe gastroenteritis, loss of fluids and electrolytes, cardiac disorders kidney impairment, collapse, shock and death. Exposure above the OEL may result in death. The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis. The substance may have effects on the peripheral nervous system, skin, mucous membranes, bone marrow, kidneys and liver, resulting in neuropathy, pigmentation disorders, perforation of nasal septum, lesions of blood cells, kidney impairment and cirrhosis. This substance is carcinogenic to humans. Animal tests show that this substance possibly causes malformations in human babies.
PHYSICAL PROPERTIES
Melting point: 288C
Density: 2.9 g/cm
Solubility in water, g/100 ml at 6C: 19
ENVIRONMENTAL DATA
This substance may be hazardous in the environment; special attention should be given to ground water contamination, aquatic organisms and soil organisms. This substance does enter the environment under normal use. Great care, however, should be given to avoid any additional release, e.g. through inappropriate disposal.
NOTES
Macquer's salt is another synonym of potassium arsenate. Do NOT take working clothes home. Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response. October 2005: see section Effects of long-term or repeated exposure.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2005