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Product Name: Sodium Arsenate Dibasic Heptahydrate
Other Names: Disodium hydrogen arsenate heptahydrate
CAS Number: 10048-95-0
Recommended Use: Laboratory reagent, chemical manufacturing intermediary
Supplier: Industrial chemical suppliers, laboratory supply companies
Contact Details: Refer to supplier documentation or chemical packaging for current emergency contacts and response numbers
Hazard Classification: Acute Toxicity Oral (Category 2), Acute Toxicity Inhalation (Category 2), Acute Toxicity Dermal (Category 2), Specific Target Organ Toxicity - Repeated Exposure (Category 1), Carcinogenicity (Category 1B), Hazardous to the Aquatic Environment (Category 1)
Hazard Statements: Fatal if swallowed, inhaled, or absorbed through skin. Causes damage to organs through prolonged or repeated exposure. Very toxic to aquatic life with long lasting effects. May cause cancer.
Pictograms: Skull and crossbones, health hazard, environment
Signal Word: Danger
Chemical Name: Sodium Arsenate Dibasic Heptahydrate
CAS Number: 10048-95-0
Formula: Na2HAsO4·7H2O
Purity: Typically ≥ 99% for laboratory applications
Impurities: Arsenic trioxide, trace metallic contaminants possible from production process
Inhalation: Remove person from exposure to fresh air immediately. Provide artificial respiration or oxygen if breathing is difficult. Get medical attention right away.
Ingestion: Rinse mouth thoroughly. Do not induce vomiting. Never give anything by mouth to an unconscious person. Seek medical help without delay.
Skin Contact: Remove contaminated clothing and rinse skin with plenty of water for at least 15 minutes while seeking medical attention.
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if possible, and continue rinsing. Call a poison center or doctor immediately.
General Advice: Seek medical attention even if no symptoms are immediately apparent, as arsenic compounds can cause delayed effects.
Suitable Extinguishing Media: Use dry chemical, carbon dioxide, alcohol-resistant foam. Water spray may be used for larger fires but avoid direct water jets which may spread contamination.
Hazards from Fire: Substance itself is not flammable, but heating can release toxic arsenic fumes and oxides of sodium.
Protective Equipment for Firefighters: Self-contained breathing apparatus and full protective gear including chemical resistant clothing.
Special Procedures: Avoid runoff from fire control methods as it may contaminate waterways. Control firefighting water to prevent environmental spread.
Personal Precautions: Evacuate unnecessary personnel. Wear appropriate personal protective equipment including gloves, eye protection, and suitable respirator.
Environmental Precautions: Prevent further leakage or spillage if safe to do so. Avoid discharge into the environment, especially waterways and soil.
Clean-Up Procedures: Sweep up and shovel spilled material using tools that minimize dust generation. Place in suitable closed, labeled containers for disposal. Ventilate area thoroughly.
Handling: Only use in well-ventilated areas or under a chemical fume hood. Avoid all unnecessary contact with material. Keep containers tightly sealed when not in use to prevent absorption of moisture and contamination.
Storage Conditions: Store in a cool, dry, and well-ventilated area away from incompatible materials like strong acids, strong bases, and reducing agents. Use corrosion resistant secondary containment.
Packaging Materials: Store in properly labeled containers made of materials compatible with sodium arsenate.
Incompatibilities: Acids, reducing agents, sources of ignition
Occupational Exposure Limits: Arsenic compounds (as As): OSHA PEL 0.01 mg/m³, ACGIH TLV 0.01 mg/m³ TWA
Engineering Controls: Use local exhaust ventilation or chemical fume hood to control airborne exposures. Use process enclosures where possible.
Personal Protective Equipment: Chemical-resistant gloves, safety goggles, lab coat or chemical protective clothing. Use NIOSH/MSHA approved respirator in insufficient ventilation.
Hygiene Measures: Wash hands thoroughly after handling. Avoid eating, drinking, or smoking in work areas. Remove contaminated clothing and protective equipment before entering eating areas.
Appearance: White crystalline solid
Odor: Odorless
Solubility: Easily soluble in water
Melting Point: Decomposes before melting
Boiling Point: Decomposes
pH: Approximately 8.3 (1% solution in water)
Vapor Pressure: Not applicable
Density: Approximately 2.66 g/cm³
Flash Point: Not flammable
Partition Coefficient: Data not available
Chemical Stability: Stable under recommended storage conditions. Hydrates may lose water if left exposed to the air.
Reactivity: Can react with acids to liberate toxic hydrogen arsenate gas.
Incompatible Materials: Strong acids, strong bases, reducing agents
Hazardous Decomposition Products: Arsenic oxides, sodium oxides, toxic fumes
Conditions to Avoid: Heat, moisture, and incompatible substances
Acute Toxicity: LD50 oral (rat): 18 mg/kg for arsenic compound, highly toxic by ingestion, inhalation, and skin absorption
Skin Corrosion/Irritation: Causes irritation or burns to skin
Serious Eye Damage/Irritation: Risk of severe eye injury
Respiratory or Skin Sensitization: Not a known sensitizer but can cause systemic effects
Carcinogenicity: Classified as a known human carcinogen by IARC and NTP
Target Organs: Liver, kidneys, nervous system
Symptoms of Exposure: Nausea, abdominal pain, vomiting, diarrhea, difficulty breathing, neurological symptoms, chronic exposure can cause skin lesions and cancer
Ecotoxicity: Highly toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Persistence and Degradability: Inorganic compound, does not degrade under natural conditions, possibility of bioaccumulation in aquatic or terrestrial organisms
Mobility in Soil: Soluble, can leach into waterways and groundwater
Other Adverse Effects: Contributes to heavy metal contamination and arsenic poisoning in the environment, affects plant and animal populations adversely
Waste Treatment Methods: Collect and contain waste for disposal by a qualified hazardous waste disposal company. Follow local, regional, and national regulations for arsenic-containing wastes.
Disposal of Containers: Do not reuse contaminated containers. Clean and dispose of according to regulatory requirements.
Special Precautions: Avoid discharge to drains or environment. Landfilling or incineration may be suitable only with appropriate controls and permits.
UN Number: UN1685
UN Proper Shipping Name: Sodium arsenate
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: II
Environmental Hazards: Marine pollutant
Transport Precautions: Keep containers upright and secure, segregate from acids, handle by trained personnel only during transport, refer to regulatory requirements for packaging and labeling
OSHA: Regulated as a carcinogen, toxic substance requiring special control measures
TSCA: Listed
SARA Title III: Reportable quantity for arsenic compounds
RCRA: Hazardous waste (D004, arsenic-containing) under federal law
DSL/NDSL (Canada): Listed
Other Regulations: Subject to restriction in food and drinking water under EPA and FDA rules, workplace use must comply with local and federal occupational safety requirements, restrictions may apply for transport and international shipment
