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Product Name: Magnesium Arsenate
Chemical Formula: Mg3(AsO4)2
CAS Number: 13510-70-8
Synonyms: Trimagnesium diarsenate, Magnesium arsenic acid salt
Recommended Use: Laboratory reagent, research chemical
Supplier: Laboratory supply companies handling specialty inorganic chemicals
Emergency Telephone: 24-hour chemical emergency contact services provided through supplier or local emergency services
GHS Classification: Acute Toxicity (Oral), Category 2; Acute Toxicity (Inhalation), Category 2; Carcinogenicity, Category 1B; Hazardous to Aquatic Environment, Category 1
Signal Word: Danger
Hazard Statements: Fatal if swallowed; Fatal if inhaled; Suspected of causing cancer; Causes damage to organs through prolonged or repeated exposure; Very toxic to aquatic life with long-lasting effects
Pictograms: Skull and crossbones, Health hazard, Environment
Precautionary Statements: Avoid breathing dust or fume, Wash hands thoroughly after handling, Wear protective gloves/protective clothing/eye protection/face protection, Avoid release to the environment
Substance: Magnesium Arsenate
Chemical Nature: Inorganic salt
Concentration: 100%
Impurities: Minimal, typically calcium or other metal salts at trace levels dependent on synthesis route
Molecular Weight: 466.11 g/mol
Inhalation: Move exposed person to fresh air immediately, keep at rest, support breathing, seek urgent medical advice; symptoms such as headache, weakness, shortness of breath, or confusion should be noted
Ingestion: Seek immediate medical attention, do not induce vomiting unless instructed by qualified personnel; rinse mouth with water if conscious, monitor for signs of nausea, abdominal pain, or diarrhea
Skin Contact: Remove contaminated clothing, immediately wash affected skin with plenty of soap and water; irritation, redness, or blistering may warrant prompt medical attention
Eye Contact: Rinse eyes cautiously with water for at least 15 minutes, keeping eyelids open, remove contact lenses if easy to do; seek medical evaluation if irritation or damage occurs
Acute Symptoms: Abdominal pain, vomiting, general weakness, difficulty breathing, shock; delayed symptoms can involve anemia, neuropathy, or cancer with long-term exposure
Suitable Extinguishing Media: Use dry chemical, carbon dioxide, foam, or water spray to extinguish surrounding fire; substance itself does not burn but may decompose to give toxic fumes
Hazardous Combustion Products: Arsenic oxides, magnesium oxide, toxic fumes
Special Protective Equipment: Firefighters should wear full protective clothing including self-contained breathing apparatus; stay upwind to avoid hazardous gases
Advice for Firefighters: Avoid runoff from firefighting entering drains or waterways; isolate the hazard area, cool containers with water spray even after fire is out
Personal Precautions: Evacuate personnel to safe zones, avoid dust formation, ventilate area, use PPE such as protective gloves, goggles, and respiratory protection
Environmental Precautions: Prevent spillage from entering surface water or groundwater, isolate and contain the spill; arsenates are highly toxic to the environment
Containment and Clean-Up: Collect material with inert, non-combustible absorbent, place in clearly labeled chemical waste container, decontaminate affected area with appropriate cleaning agents
Disposal: Follow environmental regulations for disposal; use licensed waste contractor familiar with toxic inorganic arsenic compounds
Handling: Always use in well-ventilated area or fume hood, avoid trivial contact or inhalation, wear gloves and dust mask or respirator; never eat or drink during handling
Storage: Keep tightly closed in original container, store away from acids, reducing agents, food and drink, keep in cool, dry, secure place away from incompatible substances
Precautions: Label all containers, restrict access to authorized trained personnel only, have safety shower and eye wash available, inspect regularly for sign of leaks or damage
Exposure Limits: OSHA PEL for arsenic compounds: 0.01 mg/m³ as arsenic (TWA); NIOSH REL: 0.002 mg/m³ (Ceiling); ACGIH TLV: 0.01 mg/m³ as arsenic
Engineering Controls: Use chemical fume hood, provide local exhaust ventilation, control airborne dust at source, install closed handling systems if possible
Personal Protective Equipment: Wear chemical-resistant gloves (nitrile, neoprene), laboratory coat, protective goggles, NIOSH-approved respirator.
Hygiene Measures: Wash hands, face, arms thoroughly after handling and before meals; remove contaminated clothing and equipment before leaving work area, clean regularly
Appearance: White powder or granules
Odor: Odorless
Melting Point: Decomposes before melting
Boiling Point: Not applicable
Solubility: Slightly soluble in water, insoluble in alcohol
Density: Approximately 3.7 g/cm³
pH: Not applicable in solid state
Vapor Pressure: Negligible
Partition Coefficient (n-octanol/water): Data not available
Other Data: Stable under normal laboratory conditions; dust can cause irritation and toxicity upon exposure
Chemical Stability: Stable under prescribed storage and handling conditions; avoid unnecessary exposure to air or moisture
Reactivity: Incompatible with strong acids, strong bases, strong reducing agents
Hazardous Decomposition: Forms highly toxic arsenic oxides and magnesium oxide when heated to decomposition
Polymerization: Will not occur
Conditions to Avoid: Prevent exposure to high humidity, incompatible materials, sources of ignition
Acute Toxicity: LD50 (oral, rat): ~15 mg/kg (as arsenic compound); can be fatal by ingestion or inhalation
Chronic Effects: Prolonged exposure to low levels can cause skin lesions, damage to liver and kidneys, peripheral neuropathy, cancer (IARC Group 1 carcinogen—confirmed human carcinogen)
Routes of Exposure: Inhalation, ingestion, skin contact, eye contact
Symptoms: Acute poisoning symptoms include headache, nausea, vomiting, diarrhea, cardiac arrhythmia, convulsions, coma; chronic symptoms include weight loss, muscle weakness, tingling, cancers (skin, lung, bladder)
Target Organs: Liver, kidneys, lungs, nervous system, skin
Mutagenicity & Carcinogenicity: Known mutagen; long-term exposure links to higher cancer rates; listed as a substance of very high concern for its health risks
Ecotoxicity: Very toxic to aquatic organisms, may cause long-term adverse effects in aquatic environment; arsenate ions persist and bioaccumulate in food chains
Mobility: Sparingly mobile in soil, but can leach into groundwater in acidic conditions
Persistence and Degradability: Not readily biodegradable; arsenic remains in environment for decades
Bioaccumulation: Tends to accumulate in aquatic and terrestrial organisms, magnifies up food web
Aquatic Toxicity Data: LC50 values in fish at low mg/L ranges; crustaceans and algae highly susceptible
Other Effects: Use extreme caution to prevent environmental release; local regulatory limits may classify as priority hazardous substance
Disposal Method: Treat as hazardous waste; must follow local, national, and international regulations for disposal of arsenic compounds
Incineration: Not suitable; may volatilize and spread toxins
Landfill: Only in double-lined, permitted hazardous waste landfill
Special Precautions: Use sealed and labeled chemical containers, transport using licensed waste disposal contractor, maintain manifest
Regulations: Disposal subject to Resource Conservation and Recovery Act (RCRA), CERCLA, and local state controls
UN Number: UN 1557
Proper Shipping Name: Arsenic Compound, inorganic, solid, n.o.s. (includes Magnesium Arsenate)
Hazard Class: 6.1 (Toxic substances)
Packing Group: II (medium danger)
Labels Required: Toxic, marine pollutant
Transport Procedures: Secure, sealed packaging, notification per DOT/IATA/IMO requirements; emergency contact details and MSDS supplied with shipment
Special Precautions: Keep separate from food and feedstuffs, do not transport with strong reducing agents or acids; report accidental spills or leaks to national response center
OSHA: Listed as hazardous material, enforceable exposure limits
EPA: Classified hazardous waste under RCRA (D004 – arsenic compounds), CERCLA reportable quantity 1 lb (0.454 kg)
SARA Title III: Section 302 (TPQ 500 lbs), Section 313 (Toxic chemical category)
TSCA: Listed in TSCA Inventory
EU Regulations: REACH listed, Substances of Very High Concern (SVHC); GHS/CLP-compliant labeling required
Other Global Regulations: Covered under UN transport codes, local regulations in Canada, Australia, Japan and other jurisdictions classify as Priority Pollutant
Workplace Safety: Risk assessments required before use, worker training on hazards and PPE essential, annual health surveillance recommended for repeat use environments
