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Product Name: Potassium Arsenite
Chemical Formula: KAsO2
CAS Number: 10124-50-2
Synonyms: Potassium meta-arsenite, arsenious acid potassium salt
Recommended Use: Laboratory research, historically as pesticide or preservative
Manufacturer: Please consult supplier documentation for details
Emergency Contact: Local poison control or emergency medical service
Relevant Identifiers: UN Number 1558, EC Number 233-321-1
Molecular Weight: 161.02 g/mol
GHS Classification: Acute toxicity (oral, dermal, inhalation), Category 2; Carcinogenicity, Category 1B; Specific target organ toxicity, repeated exposure, Category 2
Signal Word: Danger
Hazard Statements: Fatal if swallowed, in contact with skin or if inhaled; May cause cancer; Causes damage to organs through prolonged or repeated exposure
Pictograms: Skull and crossbones, Health hazard
Routes of Exposure: Oral, dermal, inhalation
Other Hazards: Toxic to aquatic life with long lasting effects, possible contamination of water tables.
Substance: Potassium Arsenite
Concentration: 98-100% pure
Impurities: Trace levels of potassium carbonate or arsenic oxides (check certificate of analysis)
EC Number: 233-321-1
Main Component: KAsO2 as the sole toxic ingredient
Inhalation: Move victim to fresh air immediately; seek medical attention
Skin Contact: Remove contaminated clothing, wash skin thoroughly with plenty of water and soap, seek medical attention
Eye Contact: Rinse cautiously with water for at least 15 minutes, lift eyelids occasionally, get medical help
Ingestion: Do not induce vomiting, rinse mouth with water if conscious, immediate medical attention required
Note to Physician: Monitor for signs of arsenic poisoning, support cardiac, hepatic, and renal functions, administer chelation therapy (dimercaprol or succimer) if needed
Suitable Extinguishing Media: Dry chemical, foam, carbon dioxide
Unsuitable Media: Water jets might spread contamination
Specific Hazards: Toxic fumes of arsenic oxides, potassium oxides released under fire
Firefighter Protection: Self-contained breathing apparatus, chemical resistant clothing
Precautions: Keep upwind, avoid run-off into waterways; isolate hazard area, evacuate unnecessary personnel
Personal Protection: Chemical-resistant gloves, goggles, full body suit, NIOSH-approved respirator
Environmental Precautions: Prevent entry into sewers, ground water, or surface water
Cleanup Methods: Ventilate area, contain spill, use inert absorbent material. Collect in a non-metallic, sealed container for disposal. Decontaminate area with dilute bleach solution, then rinse
Disposal: Dispose as hazardous waste in accordance with local, national guidelines
Handling: Avoid dust formation, do not eat, drink, or smoke while handling. Use fume hood or local exhaust
Storage Conditions: Store locked up, in a tightly closed, labeled container in a cool, dry, well-ventilated area away from food, acids, oxidizing and reducing agents
Incompatibilities: Strong acids, strong oxidizers, reducing agents
Hygiene Requirements: Wash hands and face thoroughly after handling, maintain strict workplace hygiene
Occupational Exposure Limits: OSHA PEL (as arsenic): 0.01 mg/m³ TWA; ACGIH TLV: 0.01 mg/m³
Engineering Controls: Chemical fume hood, local exhaust ventilation
Personal Protective Equipment: Nitrile or neoprene gloves, protective eyewear (goggles/face shield), lab coat, approved respirator for powder handling
Contaminated Clothing: Remove immediately, wash before reuse or discard as hazardous waste
Appearance: White to slightly grey crystalline solid or powder
Odor: Odorless
pH (solution): Alkaline, typically above 8
Melting Point: Decomposes above 400°C
Solubility: Soluble in water
Boiling Point: Not applicable (decomposes before boiling)
Density: 2.6 g/cm³
Vapor Pressure: Negligible at room temperature
Flash Point: Not flammable
Stability in Light: Stable under recommended storage
Partition Coefficient: Not determined
Chemical Stability: Stable under recommended conditions
Hazardous Reactions: May react violently with strong acids, oxidizing agents
Incompatible Materials: Acids, oxidizers, reducing agents
Decomposition Products: Toxic arsenic oxides, potassium oxides
Polymerization: Will not occur under normal conditions
Acute Toxicity: Extremely toxic; oral LD50 (rat) 14 mg/kg
Chronic Effects: Carcinogenic, can cause skin, lung, liver, and bladder cancers on long-term exposure
Other Health Hazards: Skin eruptions, neuropathy, anemia, gastrointestinal disturbances, respiratory tract irritation
Routes of Exposure: Ingestion, skin absorption, inhalation can all cause serious poisoning
Symptoms of Overexposure: Headache, confusion, convulsions, abdominal pain, vomiting, diarrhea, hypotension, and death in severe cases
Sensitization: No data on respiratory or skin sensitization
Carcinogenic Status: IARC Group 1 (carcinogenic to humans)
Mutagenicity: Evidence of DNA damage in animal studies
Toxicity to Aquatic Life: Highly toxic to fish and aquatic organisms, LC50 values for fish <1 mg/L
Persistence and Degradability: Inorganic, does not degrade, persists in soil and water
Bioaccumulation: Strong tendency to bioaccumulate in aquatic and terrestrial organisms
Soil Mobility: High; arsenic compounds can leach into groundwater
Other Environmental Hazards: Long-term, persistent ecosystem damage; possible contamination of agricultural products
Precautions: Strictly avoid spill and runoff; always contain appropriately
Waste Treatment: Dispose as hazardous waste. Solutions containing potassium arsenite must be collected in clearly labeled, corrosion-resistant containers
Incineration: Not suitable due to emission of toxic arsenic oxides
Land Disposal: Only allowed at approved hazardous waste facilities
Contaminated Packaging: Treat as hazardous waste
Regulatory Compliance: Dispose in accordance with local, regional, national regulations on arsenic waste
Spill Cleanup: Decontaminate equipment and clothing before reuse or discard
Do not: Discharge into sewers, waterways, or soil
UN Number: 1558
Proper Shipping Name: Potassium arsenite
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: I (highest danger)
Label Requirements: Toxic substance
Special Precautions: Keep away from food and feedstuff, protect from moisture
Regulatory Status: Listed as a highly toxic substance for international transport (ADR, IMDG, IATA)
OSHA: Regulated as a hazardous substance
EPA: Potassium arsenite is listed on CERCLA as an extremely hazardous substance; subject to strict reporting and management requirements
SARA Title III: Section 302/304, 313 reporting required
RCRA: Listed as a hazardous waste
TSCA: Listed
IARC Classification: Group 1 carcinogen
Other International Standards: REACH registration necessary for use in Europe; subject to export controls in many regions
Community Protection: Strict controls recommended for all workplace and agricultural applications; public health advisories in areas at risk of groundwater contamination
