© 2026 Sinochem Nanjing Corporation,
All Right Reserved
Product Name: Sodium Selenite
Chemical Formula: Na2SeO3
CAS Number: 10102-18-8
Synonyms: Disodium selenite, Selenious acid, Sodium salt
Recommended Use: Feed supplements, glass manufacturing, laboratory reagent, pharmaceutical industry
Supplier Information: Manufacturer and distributor address and emergency contact included with purchase documentation
Emergency Contact Number: Available through supplier and CHEMTREC database
Classification: Acute Toxicity (Oral, Dermal, Inhalation) – Category 2, Eye Irritation – Category 2A, Skin Irritation – Category 2, Carcinogenicity – Category 2
Signal Word: Danger
Hazard Statements: Fatal if swallowed, toxic by inhalation, may cause eye and skin irritation, suspected carcinogen, harmful to aquatic life
Precautionary Statements: Avoid breathing dust or vapors, avoid release into the environment, wear protective gloves and clothing, wash hands and exposed skin after handling, do not eat or drink while using the chemical
Emergency Overview: White crystalline powder, produces toxic fumes if heated, dangerous to both immediate and long-term health
Chemical Name: Sodium Selenite
Chemical Formula: Na2SeO3
Concentration: 98–100% by weight
Impurities: Traces of sodium sulfate or sodium carbonate may appear, but typically remain below 0.5%
Other Components: No significant non-hazardous components present
Inhalation: Remove from exposure immediately, move to fresh air, give oxygen if breathing is difficult, seek immediate medical attention
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with water for fifteen minutes, seek medical advice for persistent irritation
Eye Contact: Rinse immediately with plenty of water for at least fifteen minutes, lifting eyelids to flush thoroughly, contact medical professionals promptly
Ingestion: Do not induce vomiting, rinse mouth with water if victim is conscious, seek emergency medical help immediately
Most Important Symptoms: Nausea, vomiting, garlic breath, skin or eye redness, drowsiness, respiratory distress, multi-organ effects at high doses
Notes for Physicians: Sodium selenite toxicity requires rapid supportive care, monitor liver and kidney function, gastric lavage and activated charcoal may help in recent ingestion
Suitable Extinguishing Media: Carbon dioxide, dry chemical, foam, water spray
Unsuitable Extinguishing Media: Avoid high pressure streams that might spread powder
Fire Hazards: Material itself does not burn but decomposes under fire conditions releasing toxic selenium dioxide fumes
Special Protective Equipment: Self-contained breathing apparatus, full protective gear, avoid inhaling fumes
Special Firefighting Procedures: Move containers from fire area if safe, control run-off to prevent environmental contamination
Hazardous Combustion Products: Selenium oxides, sodium oxides, highly toxic gases
Explosion Hazard: Dust-air mixture may be explosive but not typical under ordinary storage
Personal Precautions: Evacuate area, avoid inhaling dust, ventilate area, wear recommended protective equipment including gloves, eye protection, and respirator
Environmental Precautions: Prevent run-off to sewers, surface water or soil, contain spillage with suitable inert absorbent material
Cleanup Methods: Collect spilled substance using electrically grounded tools, place in labeled drums for waste disposal, minimize dust generation, wash area with water after removal, dispose of all materials in accordance with regulations
Decontamination: Use soap and water to clean contaminated surfaces, avoid returning spill to original container
Reporting: Notify local environmental authorities if large quantities are released into the environment or water sources
Handling: Use only in well-ventilated areas, prevent contact with skin and eyes, avoid inhaling or ingesting dust, do not eat, drink or smoke in work area, wash hands after use, handle with equipment designed to minimize exposure
Storage: Store in tightly closed original containers, keep in a cool, dry, well-ventilated place away from acids, oxidizers, and foodstuffs, segregate away from incompatible materials, label containers clearly
Handling Precautions: Use anti-static procedures when handling powders, limit exposure time, ensure emergency wash stations and eye wash facilities are accessible nearby
Storage Conditions: Temperature control not critical but avoid excessive heat, lock storage for restricted materials to authorized personnel
Incompatibilities: Strong acids, reducing agents, hydrochloric acid vapors, avoid direct sunlight and moisture
Occupational Exposure Limits: OSHA PEL: 0.2 mg/m³, ACGIH TLV: 0.2 mg/m³ (as selenium)
Engineering Controls: Use local exhaust ventilation, closed systems and dust collection measures, process enclosures to minimize exposure
Personal Protective Equipment: Chemical-resistant gloves (nitrile or neoprene), safety goggles or face shield, lab coat or chemical apron, NIOSH-approved respirator for dusts, covered footwear
Hygiene Measures: No eating, drinking, or smoking during use, wash hands and face before breaks and after working with this material, wash clothing after contact
Environmental Exposure Controls: Prevent residues from entering drains, monitor workplace air concentrations regularly
Appearance: White to colorless crystalline powder
Odor: Odorless
pH: 9.0–10.0 (1% solution)
Melting Point: 710°C (with decomposition)
Boiling Point: Decomposes before boiling
Flash Point: Not applicable
Explosive Properties: Not explosive
Vapor Pressure: Negligible
Solubility in Water: 85–90 g/L at 20°C
Relative Density: 2.6 g/cm³
Partition Coefficient (n-octanol/water): Not determined
Viscosity: Not applicable
Evaporation Rate: Not applicable
Chemical Stability: Stable under recommended storage conditions
Reactivity: Reacts with strong acids to release toxic selenium dioxide gas, incompatible with strong reducing agents
Hazardous Decomposition Products: Selenium oxides, sodium oxides on heating
Polymerization: Will not polymerize
Conditions to Avoid: Exposure to excessive heat, acids, and moisture
Incompatible Materials: Strong acids, hydrochloric acid vapors, reducing agents
Acute Toxicity: Oral LD50 (rat): 7 mg/kg; highly toxic, potentially fatal at low doses
Skin Irritation: Causes redness and irritation upon contact
Eye Irritation: May cause serious eye irritation
Chronic Effects: Prolonged exposure causes selenium poisoning with symptoms including hair loss, nail brittleness, garlic breath, central nervous system effects
Carcinogenicity: IARC Group 2B (possibly carcinogenic to humans)
Reproductive Toxicity: Studies show potential for adverse reproductive and developmental effects
Sensitization: Not classified as a sensitizer
Target Organs: Liver, kidneys, nervous system
Ecotoxicity: Highly toxic to aquatic organisms, especially fish and aquatic invertebrates
Persistence and Degradability: Not readily degradable in the environment, accumulates
Bioaccumulative Potential: Selenium accumulates in aquatic food chains
Mobility in Soil: High solubility increases risk of movement through soil to water sources
Other Adverse Effects: Chronic low-level contamination hurts fish, birds, and mammals by accumulating in tissue
Safe Disposal: Collect and contain all waste for licenced chemical disposal, follow local and federal hazardous waste instructions
Waste Code: D010 (US EPA, characteristic hazardous waste: selenium)
Recirculation: Not recommended, limits for selenium in fertilizers and animal feeds are tightly regulated
Contaminated Packaging: Clean thoroughly or dispose as chemical waste, avoid reuse
Precautions: Do not dump in environment, sewers, or water supplies
UN Number: 2630
Proper Shipping Name: Selenium compounds, n.o.s. (Sodium selenite)
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: II
Labels Required: Toxic
Marine Pollutant: Yes
Special Transport Precautions: Protect from physical damage, prevent water contamination, follow national/international regulations and documentation requirements
US Regulations: Listed under TSCA, subject to SARA Title III Section 313 reporting due to selenium content, OSHA hazardous chemical
European Union: Listed in REACH, classified as hazardous per CLP Regulation (EC 1272/2008)
International: Subject to IATA and IMDG guidelines for transport, complies with GHS classification standards
Other Regulatory Notes: Restricted use in agriculture and feed; check local licensing and exposure limits for selenium compounds
