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Product Name: Sodium Dihydrogen Arsenate
Synonyms: Monosodium arsenic acid, Sodium arsenate monobasic
Chemical Formula: NaH2AsO4
CAS Number: 10048-95-0
Recommended Use: Laboratory chemical, production of arsenic compounds
Manufacturer/Supplier Details: Provided on request with specific contact information for emergencies
Hazard Classification: Acute Toxicity (Oral, Dermal, Inhalation) – Category 2; Carcinogenicity – Category 1B; Reproductive Toxicity – Category 1B; Specific Target Organ Toxicity (Repeated Exposure) – Category 2
Signal Word: Danger
Hazard Statements: Fatal if swallowed, inhaled or in contact with skin. May cause cancer and damage fertility or the unborn child. Suspected of causing genetic defects.
Pictograms: Skull and crossbones, Health hazard (Carcinogen), Exclamation mark environment
Precautionary Statements: Avoid all unnecessary exposure. Do not breathe dust. Do not get on skin, eyes, or clothing.
Substance: Sodium Dihydrogen Arsenate
Chemical Family: Inorganic arsenic compound
Concentration: 100% (pure substance)
Chemical Abstracts Service (CAS) Number: 10048-95-0
Impurities/Additives: No significant impurities affecting classification or toxicity have been reported
EC Number: 233-606-5
General Advice: Immediate medical attention is crucial. Remove the person from exposure– move to fresh air, avoid contact during assistance unless personal protection is used.
Inhalation: Supply oxygen if breathing is difficult. Remove to fresh air and keep at rest. Get medical help immediately.
Skin Contact: Thoroughly wash affected skin with soap and water for at least 15 minutes. Remove contaminated clothing.
Eye Contact: Flush eyes immediately with water for at least 15 minutes, holding eyelids apart. Call a doctor or poison center.
Ingestion: Rinse mouth thoroughly with water, do not induce vomiting. Seek medical assistance without delay.
Main Symptoms and Effects: Abdominal pain, nausea, vomiting, diarrhea, muscle cramps, confusion, drowsiness, hypotension, possible seizure or coma.
Suitable Extinguishing Media: Dry chemical powder, carbon dioxide, foam – avoid high-pressure water streams.
Unsuitable Extinguishing Media: Never use water jets directly on spilled product as it can disperse contaminated particles.
Specific Hazards: Releases toxic arsenic oxides/smoke on thermal decomposition.
Firefighter Protection: Certified self-contained breathing apparatus (SCBA) and full chemical protective gear. Avoid inhaling fumes and direct contact.
Further Advice: Move containers from fire zone if possible without risk. Cool closed containers with water fog to prevent overheating.
Personal Precautions: Use recommended personal protective equipment (PPE): chemical resistant gloves, goggles, lab coat, suitable respiratory protection. Keep unprotected individuals away.
Environmental Precautions: Prevent runoff to drains, water courses, soil, or vegetation. Notify local authorities if significant leakage or spillage occurs.
Cleanup Methods: Always use non-sparking tools and dust control measures. Pick up and place into a secure, labeled waste container for proper disposal.
Decontamination: Flush contaminated area thoroughly with water after initial cleanup. Ventilate area and wash after removal of material.
Disposal: Consult hazardous waste guidelines. See disposal section for sanctioned practices.
Handling: Prevent dust generation by working in a well-ventilated zone, preferably under a local exhaust hood. Wear appropriate PPE, avoid all contact with skin, eyes, and clothing. Never eat, drink, or smoke when handling chemical.
Storage Conditions: Store in tightly closed, corrosion-resistant containers away from incompatible materials (such as reducing agents, acids). Keep in a cool, dry, and secure area, away from sources of ignition.
Special Requirements: Label containers clearly with warning information. Ensure storeroom is locked and only accessible to trained personnel. Monitor storage arrangements regularly to check for leaks or deterioration.
Occupational Exposure Limits: OSHA PEL (as arsenic): 0.01 mg/m3 (Time Weighted Average); ACGIH TLV: 0.01 mg/m3 (as As)
Engineering Controls: Utilize adequate local exhaust and enclosure systems. Ventilation should maintain exposure below regulatory limits.
Personal Protective Equipment (PPE): Chemical-resistant gloves (nitrile, neoprene), safety goggles/face shield, impervious suit or lab coat, suitable respiratory protection (NIOSH-approved respirator in cases of inadequate ventilation).
Hygiene Measures: Immediate washing of hands, face and forearms after handling, before breaks, and at end of work. Remove contaminated clothing promptly and wash before reuse. Prohibit eating, drinking and smoking in work areas.
Appearance: White, crystalline powder
Odor: Odorless
Odor Threshold: Not applicable
pH (1% Solution): About 2 – 4 (acidic aqueous solution)
Melting Point/Range: Decomposes before melting
Boiling Point/Range: Not applicable (decomposes)
Solubility in Water: Easily soluble
Vapor Pressure: Not volatile
Specific Gravity: 2.8 – 3.0 at 20°C
Partition Coefficient (n-octanol/water): Not measured/not relevant to handling concerns
Evaporation Rate: Not applicable
Flash Point: Non-flammable
Flammability: Not classified as flammable
Explosive Properties: Not explosive
Chemical Stability: Stable if stored and handled according to recommended protocols. Decomposes at elevated temperatures.
Reactivity: May react with strong reducing agents, acids, or halogenated compounds.
Hazardous Decomposition Products: Gives off highly toxic arsenic oxides and sodium compounds during combustion or thermal breakdown.
Conditions to Avoid: Shelf contamination, overheating, moisture ingress, strong acids or alkalies.
Incompatibility: Strong reducing agents, acids, and chlorinated materials.
Routes of Exposure: Inhalation, ingestion, skin contact, eye contact
Acute Toxicity: LD50 (oral, rat): approx. 8 mg/kg for arsenic compounds – highly toxic
Symptoms: Severe gastrointestinal pain, vomiting, diarrhea, dehydration, low blood pressure, shock, kidney and liver injury, central nervous system effects, hemolysis, death
Chronic Effects: Carcinogen (human data supports links to lung, skin, bladder cancers), reproductive hazard, developmental toxicity, peripheral neuropathy, skin changes, blackfoot disease
Sensitization: Not classified as skin sensitizer
Mutagenicity: Evidence of genetic mutation in lab studies
Other Information: Symptoms may be delayed. Even small doses can be fatal with sufficient exposure.
Ecotoxicity: Toxic to aquatic life with potential for long-term environmental effects. Arsenates can persist in soil and groundwater, endangering plants, animals, and humans.
Persistence and Degradability: Inorganic arsenic does not degrade. Readily migrates through soil and water, accumulating in biological systems.
Bioaccumulation Potential: Can accumulate in fish, wildlife, and crops, entering the food chain.
Mobility in Soil: High mobility, especially under acidic conditions.
Other Adverse Effects: Strong toxic hazard to birds, insects, and mammals. Water contamination can have lasting effects on population health.
Waste Treatment Methods: Hazardous waste must go to a licensed disposal contractor. Complete containment required throughout process – do not allow to reach drains, sewers, or soil.
Disposal Containers: Use tightly sealed, properly labeled, corrosion-proof containers.
Disposal of Contaminated Packaging: Decontaminate and dispose in compliance with hazardous waste regulations.
Regulatory Waste Codes: U.S. EPA (RCRA): P012 (acutely hazardous waste), applicable local regulations apply.
Other Advice: Consult local, national, and regional environmental regulations before disposal. No disposal via general refuse or regular incineration.
UN Number: UN 1685
Proper Shipping Name: Sodium arsenate
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: I (substances presenting high danger)
Environmental Hazards: Classified as Marine Pollutant (IMDG regulations)
Special Precautions for Transport: Keep securely packaged. Secure against shifting, ensure proper hazard labels and documentation.
Other Shipping Information: Only authorized personnel with hazardous materials training should transport this compound. Comply with all regulatory requirements during shipping, storage, and receipt.
U.S. Regulations: OSHA hazardous substance, SARA Title III Section 302/313 (Reportable Quantity/Extremely Hazardous Substance), TSCA listed, RCRA hazardous waste
International Regulations: EU REACH Registration, GHS/CLP hazard criteria met, IARC Group 1 (Carcinogenic to humans), included under Rotterdam and Stockholm Conventions (regulating persistent organic pollutants and international trade), Canadian WHMIS and NPRI regulated
Labeling: Product and packaging to display all relevant hazard, cautionary, and handling information as guided by local and international regulations.
Restrictions: Many jurisdictions restrict use or sale of arsenic compounds outside tightly controlled environments such as research labs or specific industrial uses.
Other Legal Considerations: Handling demands detailed training, strict workplace controls, and regular monitoring in many regions. Consult current, local, and regional legal requirements before use.
