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Product Name: Disodium Hydrogen Arsenate
Synonyms: Sodium arsenate dibasic, Disodium hydrogen arsenate heptahydrate
Chemical Formula: Na2HAsO4
CAS Number: 10048-95-0
Intended Use: Laboratory reagent, research applications
Manufacturer: Typically listed on commercial packaging, check your supplier information
Emergency Contact Number: Local poison control center, company-specific emergency line if available
Classification: Acute toxicity (Oral, Dermal, Inhalation) - Category 2; Carcinogenicity - Category 1B; Specific Target Organ Toxicity - Single Exposure, Repeated Exposure (Kidneys, Liver) - Category 1
Signal Word: Danger
Hazard Statements: Fatal if swallowed or inhaled; toxic in contact with skin; may cause cancer; causes damage to organs through prolonged or repeated exposure
Pictograms: Skull and crossbones, Health hazard
Precautionary Statements: Do not breathe dust; avoid all contact with skin and eyes; do not eat, drink, or smoke while using; use only outdoors or in a well-ventilated area; wash thoroughly after handling
Target Organs: Kidneys, liver, lungs, nervous system
NFPA Ratings: Health: 4; Flammability: 0; Reactivity: 0
Chemical Name: Disodium hydrogen arsenate
CAS Number: 10048-95-0
Percent (w/w): 100% (may be supplied as heptahydrate, check label)
Impurities: Usually negligible in analytical grade, always consult certificate of analysis for batch-specific details
Molecular Weight: 211.89 g/mol (anhydrous)
Inhalation: Remove to fresh air at once. If breathing is difficult, give oxygen; provide artificial respiration if necessary. Immediate medical attention essential.
Skin Contact: Remove contaminated clothing and rinse skin with copious amounts of water and soap. Seek medical help urgently.
Eye Contact: Flush eyes gently with running water for at least 15 minutes, lifting eyelids occasionally for thorough rinse. See a doctor right away.
Ingestion: Do not induce vomiting. Rinse mouth. Give water if victim is conscious. Medical intervention imperative.
Symptoms of Exposure: Burning sensation, headache, cough, nausea, vomiting, abdominal pain, convulsions, cyanosis, confusion, and death in severe poisoning
Advice for First Responders: Wear protective gear including gloves, goggles, and a suitable respirator if risk of exposure is suspected; avoid direct contact with victim’s secretions.
Suitable Extinguishing Media: Dry chemical, carbon dioxide, or foam. Use water spray for cooling containers exposed to fire.
Specific Hazards: Substance itself is non-flammable, but toxic and irritating arsenic-containing gases (arsenic oxides) can form in fire
Protective Equipment: Firefighters require full protective clothing, self-contained breathing apparatus
Special Precautions: Avoid inhaling any combustion fumes; keep run-off water out of sewers and water sources; notify authorities if runoff occurs
Explosion Data: No reported explosion hazard; does not present dust explosion risk under normal conditions
Personal Precautions: Evacuate non-essential personnel, restrict access to area. Don suitable protective equipment: gloves, goggles, chemical suit, and appropriate respirator.
Environmental Precautions: Prevent material from entering soil, drains, or water bodies. Alert environmental authorities about large spills.
Containment: Dampen the powder to avoid airborne dust. Collect spilled material using tools that do not disperse dust.
Clean-Up Method: Shovel carefully into leak-proof, labeled containers for proper disposal. Ventilate area after clean-up.
Decontamination: Wash area of spill with soap and water, collect washings for proper disposal as hazardous waste.
Additional Procedures: Remove contaminated clothing; launder before reuse. Report significant spills to supervisory personnel.
Handling: Handle only in well-ventilated chemical fume hood. Avoid creating dust or aerosols. Do not eat, drink, or smoke in areas where this chemical is handled.
Storage: Store in tightly closed containers in a cool, dry, well-ventilated, secured location; away from acids, reducing agents, and food items.
Other Recommendations: Keep away from children and unauthorized persons. Mark storage area as “Toxic Chemicals”. Regularly inspect containers for signs of leaks or corrosion.
Incompatibilities: Strong acids, reducing substances, oxidizers may react to form toxic gases.
Hygiene Measures: Always wash hands, face, and exposed skin after handling.
Occupational Exposure Limits: OSHA PEL: 0.01 mg/m³ (as As); NIOSH REL: 0.002 mg/m³ (as As, 15 min ceiling); ACGIH TLV: 0.01 mg/m³ (as As)
Engineering Controls: Use only in fume hood or local exhaust ventilation systems rated for toxic particulates
Respiratory Protection: Use government-approved respirator (e.g. NIOSH N100/P100 cartridge respirator) for powder/dust
Skin Protection: Chemical-resistant gloves, lab coat, full protective suit for large-scale handling
Eye/Face Protection: Tight-fitting chemical safety goggles and full face shield for higher risk operations
Environmental Exposure Controls: Use bunding and secondary containment; all effluent must go through dedicated hazardous chemical waste treatment
Other Protective Measures: Emergency shower and eye wash stations in immediate work area
Appearance: White crystalline powder
Odor: Odorless
Odor Threshold: Not applicable
Melting Point: Decomposes on heating above 180°C (anhydrous); hydrate loses water below 100°C
Boiling Point: Not applicable (decomposes before boiling)
Relative Density: 2.87 (anhydrous)
Solubility: Freely soluble in water; practically insoluble in alcohol
pH (aqueous solution): Approx. 9 (1% solution, hydrate)
Vapor Pressure: Negligible at room temperature
Partition Coefficient (log Kow): Not available
Viscosity: Not relevant (solid)
Other Data: Hygroscopic; forms hydrates easily in humid air; decomposes in acidic conditions, releasing highly toxic arsine or arsenic oxides
Chemical Stability: Stable under recommended storage; decomposes in presence of acids to release arsenic trioxide
Reactivity: Reacts strongly with acids, reducing agents
Conditions to Avoid: Moisture, heat, incompatible materials, acidic conditions
Incompatible Materials: Strong acids, reducing agents, sulfur compounds
Hazardous Decomposition Products: Arsenic oxides, arsine gas
Polymerization: Does not occur
Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Toxicity: Oral LD50 (rat) approx. 40 mg/kg; highly toxic with fatal potential in humans
Chronic Effects: Cancer, skin pigmentation changes, peripheral neuropathy, liver and kidney damage
Symptoms: Nausea, vomiting, abdominal pain, muscle cramps, cardiac arrhythmias, multi-organ failure
Carcinogenicity: IARC Group 1 (carcinogenic to humans), NTP: Known human carcinogen
Reproductive Toxicity: Evidence indicates risk of fetal harm and developmental delays in exposed populations
Mutagenicity: Positive results in several in vitro and in vivo assays
Other Data: Repeated or prolonged exposure can cause systemic toxicity; effects may be delayed.
Ecotoxicity: Very toxic to aquatic life with long lasting effects
Persistence and Degradability: Persistent in the environment; strong tendency to bioaccumulate in aquatic and terrestrial organisms
Bioaccumulative Potential: Noted for arsenic compounds – accumulates in fish, crustaceans, and plants
Mobility in Soil: Moderate to high; leaching into groundwater poses threat to drinking water safety
Other Adverse Effects: Can cause ecosystem damage by interfering with nutrient cycles; arsenic contamination is linked to agricultural, livestock, and human health issues
Avoid Release: Take all precautions to prevent contamination of water, soil, or air.
Disposal Methods: Treat as hazardous waste in accordance with all local, state, and federal regulations; recommended method involves high-temperature incineration in licensed facilities
Container Disposal: Rinse empty containers three times; puncture and dispose with hazardous waste
Do Not: Discharge into sewers, rivers, or public garbage streams
Special Precautions: Label all waste with proper identification and hazard warnings
Regulatory Guidance: Consult authorities for required permits and documentation
UN Number: UN1685
Proper Shipping Name: Disodium hydrogen arsenate
Transport Hazard Class: 6.1 (Toxic Substance)
Packing Group: II
Marine Pollutant: Yes
Transport Label: Toxic
Regulations: Subject to DOT, IMDG, IATA, and ADR requirements
Transport Precautions: Secure containers, avoid rough handling, carry spill response equipment
US EPA: Listed hazardous substance, subject to CERCLA, SARA Title III (Section 313) and RCRA regulations
OSHA: Covered under the Hazard Communication Standard with strict exposure limits
EU Regulations: REACH Registration required; listed as a substance of very high concern
IARC/NTP: Recognized human carcinogen
Canada WHMIS: Classified as Toxic and Carcinogenic Material
Additional Guidance: Handlers must provide safety training, maintain up-to-date records, and provide access to safety information and emergency procedures in all work areas
Restrictions: Use subject to strict licensing and reporting in many jurisdictions; research and educational handling must comply with national chemical safety controls
