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Product Name: Selenium Oxychloride
Chemical Formula: SeOCl2
Synonyms: Selenoyl chloride, Selenious oxychloride
CAS Number: 7791-23-3
Recommended Use: Chemical reagent in synthesis, research applications
Manufacturer/Supplier: Named contact required based on purchase
Contact Information: Address, phone number, and emergency contact for chemical supplier or manufacturer
GHS Classification: Acute Toxicity (oral, inhalation, dermal), Skin Corrosion, Serious Eye Damage
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage, toxic if inhaled, harmful if swallowed or absorbed through skin
Pictograms: Corrosive, Skull and Crossbones
Precautionary Statements: Wear appropriate protective equipment, avoid breathing vapors, prevent contact with eyes, skin, and clothing
Health Effects: Inhalation can result in severe respiratory irritation, coughing, and shortness of breath, eye contact leads to burns, possible blindness, ingestion causes severe gastrointestinal corrosion
Chemical Name: Selenium oxychloride
CAS Number: 7791-23-3
Concentration: 100% (pure substance)
Molecular Weight: 165.32 g/mol
Inhalation: Remove the person to fresh air immediately, provide oxygen if breathing is difficult, seek medical attention without delay
Eye Contact: Rinse eyes cautiously with water for at least 15 minutes, keep eyelids open, remove contact lenses if present, obtain immediate medical attention
Skin Contact: Remove contaminated clothing, wash affected skin thoroughly with soap and plenty of water, seek immediate medical help as burns may progress
Ingestion: Do not induce vomiting, rinse mouth with water, provide water to dilute only if victim is conscious, urgently transfer to medical facility
Symptoms: Burning, coughing, breathing difficulty, severe pain, nausea, vomiting, eye damage
Suitable Extinguishing Media: Dry chemical powder, carbon dioxide, alcohol-resistant foam; avoid water contact with chemical, as hazardous gases may form
Hazards from Combustion: Toxic fumes of selenium and hydrogen chloride gas released if involved in fire; significant inhalation risk
Protective Equipment: Self-contained breathing apparatus (SCBA), full protective suit including gloves and boots designed for chemicals
Advice for Firefighters: Move containers away from fire if safe, contain any runoff, avoid inhaling reaction gases, cool exposed containers using water fog only from a safe distance
Personal Precautions: Evacuate area, restrict access, ventilate space, use personal protective equipment (respirator, gloves, goggles, full suit)
Environmental Precautions: Prevent spillage from reaching drains, surface water, or soil; contain using sand, inert absorbent
Cleanup: Collect using non-combustible absorbent, place in sealed chemical waste container; ventilate and wash contaminated area thoroughly
Disposal: Arrange pickup by certified disposal contractor with experience handling highly toxic selenium compounds
Handling: Carry out all operations in well-ventilated fume hood, keep container closed tightly, avoid contact with air, moisture, and direct sunlight
Storage Conditions: Store in cool, dry, well-ventilated location, away from incompatible materials such as water, alcohols, strong bases, oxidizing agents; keep in original container
Safe Packaging: Use corrosion-resistant containers with secure sealing, regularly inspect for damage or leaks
Incompatibilities: Reacts violently with water, forms hazardous gases with alcohols and bases
Occupational Exposure Limits: Selenium compounds OSHA PEL: 0.2 mg/m3 (as Se), NIOSH REL: 0.2 mg/m3 (as Se)
Engineering Controls: Use local exhaust ventilation, chemical fume hood, air monitoring for selenium vapor
Personal Protective Equipment: Impermeable gloves (nitrile, butyl rubber), chemical goggles, face shield, laboratory coat or suit, proper footwear
Respiratory Protection: Full-face respirator with acid gas/HEPA cartridges or positive pressure supplied-air respirator when risk of inhalation exists
Hygiene Measures: Wash hands and face after handling, remove contaminated clothing, do not eat, drink, or smoke in areas of use
Appearance: Fuming, colorless to pale yellow liquid
Odor: Sharp, irritating odor
Melting Point: -24°C
Boiling Point: 190°C
Density: 2.657 g/cm3 at 20°C
Solubility: Reacts with water to produce selenium dioxide and hydrochloric acid
Vapor Pressure: 0.08 mmHg at 25°C
Viscosity: Not available
Flash Point: Data not available, but not expected to be flammable
Decomposition: Releases toxic selenium oxides, hydrogen chloride fumes with heat or contact with water
Chemical Stability: Stable under dry, inert conditions with tightly closed packaging
Reactive With: Water, alcohols, strong bases, oxidizers; vigorous, hazardous reactions possible
Hazardous Decomposition Products: Selenium dioxide, chlorine, hydrogen chloride gas
Polymerization: No known hazardous polymerization reactions
Thermal Decomposition: Rapid decomposition at high temperatures or with incompatible contact, producing toxic, corrosive fumes
Routes of Exposure: Inhalation, skin absorption, ingestion, eye contact
Acute Toxicity: LD50 (oral, rat): estimated 20-50 mg/kg; LC50 (inhalation, rat): estimated below 500 mg/m3
Symptoms of Exposure: Severe burns, gastrointestinal damage, coughing, difficulty breathing, possible pulmonary edema, eye and skin corrosion, systemic selenium poisoning
Chronic Effects: Prolonged or repeated exposure may cause selenium toxicity (selenosis): garlic breath, gastrointestinal distress, neurological effects, hair and nail loss
Carcinogenicity: IARC: not classifiable for selenium oxychloride
Mutagenicity/Teratogenicity: Limited data for this compound, caution warranted due to selenium's systemic toxicity
Aquatic Toxicity: Highly toxic to aquatic life, selenium compounds bioaccumulate easily, causing harm to fish and aquatic birds
Persistence and Degradability: Not readily biodegradable, persistent selenium residues in water and soil
Bioaccumulation Potential: Elevated, risk of long-term accumulation in food chain, toxicity to higher organisms
Mobility in Soil: Rapid migration and leaching possible; may contaminate underlying aquifers
Additional Ecological Hazards: Avoid release to environment, consult local environmental agencies for clean-up guidance
Waste Disposal Method: Collect in tightly sealed, clearly labeled containers for hazardous waste, do not allow to enter watercourses or sewers
Specifically Controlled: Must undergo disposal by licensed hazardous waste contractor familiar with selenium detoxification
Container Disposal: Triple-rinse then puncture or destroy, dispose via hazardous waste stream
Legal Requirements: Follow all regional, national, and international regulations on selenium compounds and their mixtures
UN Number: UN 3286
Proper Shipping Name: Selenium oxychloride
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: I (Packing group for substances presenting high danger)
Labels Required: Corrosive, Toxic
Special Precautions: Avoid transport with food, feedstuffs, strong bases, oxidizers, or acids; maintain original, sealed packaging; written documentation required for international movement
Regulatory Guidance: Adhere to IATA, IMDG, and DOT guidelines for hazardous materials
Classification under OSHA: Corrosive and highly toxic material, covered under OSHA Hazard Communication Standard
EPA Regulation: Reportable under CERCLA and the Clean Water Act, subject to SARA Title III Section 313 (Toxic Chemical Release Inventory)
TSCA Status: Listed on United States TSCA Chemical Substance Inventory
EU Regulations: Listed in REACH Annexes, restricted use as dangerous substance
Other Requirements: Full hazard training for all personnel, regular safety audits; periodic review of local environmental emissions and worker exposure records
