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Chemical Name: Sodium Selenate
Synonyms: Disodium selenate, Selenic acid, disodium salt
CAS Number: 13410-01-0
Molecular Formula: Na2SeO4
Molecular Weight: 188.95 g/mol
Recommended Uses: Used in animal feed supplements, glass manufacturing, pigments, laboratory reagents
Supplier Information: Relevant manufacturer or distributor, including full address and emergency phone number
Emergency Contact: 24-hour emergency phone number provided by company or local regulatory body
Classification: Acute toxicity - Oral (Category 2), Acute toxicity - Inhalation (Category 2), Hazardous to aquatic environment (Acute - Category 1, Chronic - Category 1)
Signal Word: Danger
Hazard Statements: Fatal if swallowed, Fatal if inhaled, Very toxic to aquatic life with long lasting effects
Pictograms: Skull and crossbones, Environment
Precautionary Statements: Do not breathe dust/fume/gas/mist/vapors/spray, Wear protective gloves/protective clothing/eye protection/face protection, Avoid release to the environment, If exposed or concerned: Get immediate medical advice/attention
Main Ingredient: Sodium Selenate
CAS Number: 13410-01-0
Concentration: ≥ 98%
Impurities: May contain minute amounts of sodium sulfate, moisture, or trace selenium oxides depending on supplier
Inhalation: Move affected person to fresh air as quickly as possible. Keep individual warm and at rest. Seek immediate medical attention. Provide artificial respiration if breathing has stopped.
Skin Contact: Remove contaminated clothing and wash affected skin thoroughly with soap and water. Seek medical advice if symptoms develop.
Eye Contact: Rinse eyes immediately with plenty of water for at least 15 minutes, lifting eyelids. Get medical attention if irritation persists.
Ingestion: If swallowed, call a poison control center or doctor right away. Do not induce vomiting. Never give anything by mouth to an unconscious person.
Suitable Extinguishing Media: Water spray, dry chemical, carbon dioxide, or foam can be used as appropriate for surrounding materials.
Specific Hazards: Decomposition releases toxic fumes of selenium oxides and sodium oxide. Fumes may be highly irritating.
Protective Equipment: Firefighters should wear self-contained breathing apparatus and full protective gear.
Special Instructions: Prevent runoff from entering drains or watercourses. Cool exposed containers with water spray to prevent pressure build-up.
Personal Precautions: Wear suitable protective clothing, gloves, and eye/face protection. Avoid breathing dust, vapors, or mist. Evacuate surrounding area if large spill.
Environmental Precautions: Prevent spillage from entering watercourses or groundwater. Notify local environmental authorities if major contamination occurs.
Methods for Clean-Up: Use non-sparking tools to collect spill. Sweep up material, place in sealable container, and hold for disposal. Ventilate the area thoroughly before re-entry.
Decontamination: Wash spill site after material clean-up is complete to remove residues.
Handling: Only handle in well-ventilated settings, using procedures that minimize the amount of dust generated. Do not eat, drink, or smoke when using. Wear personal protective equipment. Wash exposed skin thoroughly after handling.
Storage: Store in a tightly closed original container. Place in cool, dry, well-ventilated area, protected from incompatible materials like strong reducers and organic substances. Clearly label storage tanks or bins.
Incompatible Materials: Avoid contact with acids, strong reducing agents, organic materials, and combustibles.
Occupational Exposure Limits: OSHA PEL for selenium compounds (as Se): 0.2 mg/m3 (TWA); ACGIH TLV: 0.2 mg/m3 (TWA)
Engineering Controls: Use local exhaust or general dilution ventilation systems to maintain airborne levels below recommended limits.
Respiratory Protection: For dusts and vapors, wear an approved NIOSH or EN respirator suitable for airborne selenium compounds.
Eye Protection: Safety goggles or face shield.
Skin Protection: Gloves made of suitable chemically resistant material. Wear laboratory coat or chemical resistant suit if large-scale exposure occurs.
Hygiene Measures: Wash hands, face, and exposed skin after handling. Remove contaminated clothing before leaving work area.
Appearance: White, crystalline powder or granules
Odor: No distinct odor
Odor Threshold: Not established
pH: 8.5–10.0 (1% solution)
Melting Point: Decomposes above 600°C
Boiling Point: Not applicable (decomposes before boiling)
Flash Point: Not applicable
Flammability: Non-flammable
Explosive Properties: Not explosive
Vapor Pressure: Negligible at room temperature
Solubility in Water: Soluble (approximately 85 g/100 mL at 20°C)
Density: Approximately 3.1 g/cm3
Partition Coefficient (n-octanol/water): Not available
Auto-ignition Temperature: Not self-igniting
Other Properties: Stable under ordinary conditions, can absorb moisture from air (hygroscopic), not volatile
Chemical Stability: Remains stable when stored under recommended conditions.
Reactivity: Reacts strongly with reducing agents, producing potentially hazardous products.
Conditions to Avoid: Moisture, heat, contact with organic materials, and sources of ignition.
Hazardous Decomposition Products: Yields selenium oxides, sodium oxides, and potentially hydrogen selenide upon thermal decomposition.
Polymerization: Not likely to polymerize.
Acute Toxicity: Highly toxic by oral and inhalation routes. Oral LD50 (rat): ~1.6 mg/kg.
Chronic Effects: Prolonged exposure damages central nervous system, gastrointestinal tract, and causes hair and nail loss. Symptoms of selenium poisoning can develop rapidly.
Sensitization: Can cause allergic skin and respiratory reactions in sensitive people.
Carcinogenicity: Not classified as carcinogenic by IARC, NTP, or OSHA.
Mutagenicity: Some evidence from animal studies, significance uncertain.
Other Potential Effects: May cause nausea, vomiting, diarrhea, metallic taste, garlicky breath, skin eruptions, or irritability after significant exposure.
Target Organs: Liver, kidneys, lungs, nervous system
Aquatic Toxicity: Very toxic to aquatic life, even at low concentrations (LC50, fish, 96 h: 0.15–0.68 mg/L).
Persistence/Degradability: Does not degrade readily in environment; can bioaccumulate in tissues of aquatic organisms.
Bioaccumulation Potential: High; accumulates in aquatic food chains, harming fish and birds.
Mobility in Soil: Highly mobile in moist soils and may contaminate nearby water systems.
Other Adverse Effects: Large-scale contamination poses risk to ecosystems and drinking water; requires close monitoring near industrial discharge points.
Waste Treatment: Considered hazardous waste. Collect in tightly sealed, labeled containers.
Methods of Disposal: Dispose according to local, state, and national regulations for hazardous selenium-containing substances. Incinerate at authorized chemical-waste facility when possible, avoid landfill unless permitted.
Contaminated Packaging: Decontaminate or incinerate empty containers under oversight of qualified professionals.
Special Precautions: Never release into the environment or normal waste streams.
UN Number: UN2630
UN Proper Shipping Name: Selenium Compound, n.o.s. (Sodium Selenate)
Transport Hazard Class: 6.1 (Toxic Substances)
Packing Group: II (Medium danger)
Labels: Toxic, Environmental hazard
Special Precautions for Transport: Store upright, separated from food and incompatible substances. Documentation should accompany shipment.
Regulatory Notes: Subject to strict shipping and environmental regulations under IMDG, IATA, DOT, and other relevant authorities.
US Regulations: Sodium Selenate classified under CERCLA (reportable quantity: 1 lb or 0.454 kg). OSHA, SARA Title III Section 313 substance.
EU Regulations: Classified as a dangerous substance under EC Reg. 1272/2008 (CLP), subject to REACH restrictions.
Canada: WHMIS Class D1A/B (Very Toxic Material), E (Corrosive)
Other International: Listed on Australia AICS, China IECSC, Japan ENCS, Korea ECL
Restrictions: Use and storage may require permitting and reporting to appropriate national or local agencies. Stringent workplace monitoring and training recommended where handled in significant quantities.
