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Product Name: Diammonium Hydrogen Arsenate
Synonyms: Diammonium arsenate, Ammonium hydrogen arsenate
Chemical Formula: (NH4)2HAsO4
CAS Number: 7783-28-0
Recommended Use: Mainly for laboratory research, sometimes referenced in industrial processes involving heavy metals.
Supplier Details: Chemical manufacturer contact information and emergency phone number included on packaging.
Hazard Class: Acute toxicity (oral, dermal, inhalation), carcinogenicity, specific target organ toxicity
Signal Word: Danger
Hazard Statements: Toxic if swallowed, inhaled, or absorbed through the skin; may cause cancer; suspected of damaging fertility or the unborn child; causes damage to organs through prolonged or repeated exposure
Pictograms: Skull and crossbones, health hazard
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Precautionary Statements: Avoid all unnecessary exposure. Handle with reinforced chemical-resistant gloves and face protection. Keep away from children and food handling areas.
Main Ingredient: Diammonium Hydrogen Arsenate
Concentration: Pure, typically >98%
Impurities: May contain trace levels of other arsenate compounds depending on supplier.
Arsenic Content: High relative to ammonium component, which is highly regulated as a heavy metal contaminant.
Inhalation: Move victim to fresh air as quickly as possible. Seek medical attention without delay. If breathing is difficult, provide oxygen. If breathing stops, perform artificial respiration.
Skin Contact: Remove contaminated clothing. Wash affected skin thoroughly with soap and water for at least 15 minutes. Immediate medical help crucial, as symptoms might not show right away.
Eye Contact: Immediately flush eyes with plenty of water for 15 minutes, keeping eyelids open. Promptly summon medical assistance.
Ingestion: Do not induce vomiting. Rinse mouth thoroughly with clean water. Call for medical help. Never give anything by mouth to someone who is unconscious.
Most Important Symptoms: Nausea, vomiting, diarrhea, headaches, confusion, severe abdominal pain, respiratory distress, convulsions, risk of cancer and chronic organ damage with prolonged or repeated contact. Rapid medical intervention is essential.
Suitable Extinguishing Media: Use dry chemical, CO2, or sand. Water spray can be used for cooling containers, not for direct jet.
Specific Hazards: May release toxic fumes including arsenic oxides and ammonia during combustion. The release of heavy metals and highly irritating gases possible during fires.
Protective Equipment for Fire-Fighters: Fire responders must use self-contained breathing apparatus and full protective gear. Avoid contact with runoff water.
Special Procedures: Isolate hazard area. Evacuate all persons not involved in emergency response.
Personal Precautions: Evacuate area and keep unprotected personnel away. Wear full chemical protective clothing and respiratory protection.
Environmental Precautions: Prevent material from contaminating soil, sewers, waterways, and drains. Notify environmental authorities if significant release occurs.
Spill Cleanup Methods: Avoid raising dust. Sweep or vacuum up material using tools that prevent dust formation, place in properly labeled and tightly closed disposal containers. Wash spill area with plenty of water after collection, containing all wash waters.
Handling: Handle in a properly ventilated chemical fume hood using heavy-duty gloves, face shields, and apron. Minimize dust generation and accumulation. Never eat, drink, or smoke near work areas.
Storage: Store in cool, dry, well-ventilated areas away from incompatible substances, such as acids and strong oxidizers. Use containers lined with corrosion-resistant materials. Clearly label all storage vessels and ensure secondary containment is in place.
Occupational Exposure Limits: Arsenic OSHA PEL: 0.01 mg/m3 (as As); NIOSH REL: 0.002 mg/m3.
Engineering Controls: Use process enclosures, local exhaust ventilation, or other engineering controls to keep airborne concentrations below recommended limits.
Personal Protection: Heavy-duty chemical-resistant gloves, goggles or face shield, fitted respirator (P100 or equivalent cartridge), protective lab coats and impermeable footwear.
Hygiene: Remove contaminated clothing immediately. Wash thoroughly after handling.
Appearance: White crystalline solid
Odor: Odorless
Molecular Weight: 219.99 g/mol
Melting Point: Decomposes above 185°C
Solubility: Freely soluble in water
pH (1% solution): Slightly acidic
Density: Approximately 2.37 g/cm3
Stability: Stable in most conditions if dry and stored away from incompatible materials.
Reactivity: Reacts with acids to release toxic gases; contact with strong oxidizers may cause violent reactions.
Decomposition Products: Ammonia, arsenic oxides, and possibly hydrogen arsenate vapors.
Incompatibilities: Strong acids, alkalis, oxidizing agents, reducing agents.
Acute Toxicity: Highly toxic. Oral LD50 in rats estimated around 40 mg/kg.
Chronic Effects: Prolonged exposure linked to cancer, skin lesions, respiratory issues, nervous system effects, anemia, and gastrointestinal problems. Arsenic compounds have strong cumulative effects in tissues.
Routes of Exposure: Ingestion, inhalation, and skin absorption cause the most risk.
Carcinogenicity: Classified as a known human carcinogen (IARC Group 1, ACGIH A1).
Aquatic Toxicity: Extremely hazardous to aquatic life. Bioaccumulates rapidly in fish and other organisms.
Mobility: High solubility in water leads to rapid distribution in soil and water where it can persist for years.
Persistence and Degradability: Does not degrade readily, remains as a contaminant.
Bioaccumulation: Arsenic from this compound accumulates up the food chain, posing far-reaching ecological and health risks for wildlife and humans.
Disposal Methods: Disposal only allowed at licensed hazardous material treatment, storage, and disposal facility. Packaging and wastes contaminated with this material must be treated as hazardous waste.
Do Not: Do not drain to wastewater systems, do not dispose of in regular trash.
Special Precautions: Triple-rinse containers before disposal, ensuring all residues managed as hazardous material.
UN Number: UN1557
Transport Hazard Class: 6.1 (Toxic substance)
Packing Group: II
Proper Shipping Name: Arsenic compound, inorganic, solid, n.o.s. (Diammonium hydrogen arsenate)
Special Transport Notes: Shipment requires labeling as a toxic and environmentally hazardous material. Emergency action code and spill response kits strongly recommended during transit.
OSHA Status: Hazardous chemical regulated under OSHA standards.
SARA Title III: Listed as Extremely Hazardous under Section 302 and a toxic chemical under Section 313.
TSCA: Listed substance in the United States.
CERCLA: Reportable quantity established for arsenic compounds; release must be reported.
Other Regulations: Subject to strict local, state, and federal restrictions internationally due to toxicity and potential misuse for environmental and human health.
