Product Name: Selenium Citrate
Chemical Formula: C6H5O7Se
Recommended Uses: Laboratory reagent, chemical synthesis
Manufacturer: Chemical supplier contact information required per shipment
Telephone: Supplier emergency contact line available on shipping documents
Emergency Phone: Refer to state or national poison control, hazardous material response center
Synonyms: Selenious acid citrate salt
Use Restrictions: For professional laboratory use only; not for food, drug, or cosmetic purposes
GHS Classification: Acute toxicity (oral, dermal, inhalation), specific target organ toxicity, environmental hazard
Signal Word: Danger
Hazard Statements: Toxic if ingested, inhaled, or absorbed through skin; may cause damage to organs; causes serious eye irritation; may cause allergic skin reaction; very toxic to aquatic life
Pictograms: Skull and crossbones, exclamation mark, environment
Precautionary Statements: Avoid breathing dust or fumes, avoid release to the environment, wear protective gloves, clothing, eye and face protection, wash hands thoroughly after handling, keep away from food and drink
Chemical Name: Selenium Citrate
CAS Number: 55698-32-7
Concentration: ≥ 98% by weight
Impurities: May contain less than 1% sodium citrate or citric acid stabilizers
Other Components: No additives or preservatives intentionally added
Inhalation: Move affected individual to fresh air immediately, keep comfortable, seek medical attention for any difficulty breathing, respiratory irritation, or persistent coughing
Skin Contact: Remove contaminated clothing, wash exposed skin with generous amounts of soap and water, call physician if irritation or rash appears
Eye Contact: Rinse cautiously with water for at least 20 minutes, lifting eyelids to ensure thorough removal, consult a doctor after flushing
Ingestion: Rinse mouth with water, never give anything by mouth to an unconscious person, get urgent medical advice, monitor for symptoms of selenium toxicity (headache, nausea, garlic breath odor)
Symptoms: Nausea, dizziness, abdominal pain, metallic or garlic-like breath odor, blistering or desquamation of skin, persistent cough
Suitable Extinguishing Agents: Dry chemical powder, carbon dioxide, foam, water spray for surrounding fire
Unsuitable Agents: Do not use full water jet directly, risk of spreading contamination
Hazardous Combustion Products: Selenium oxides, toxic fumes
Personal Protection: Wear self-contained breathing apparatus and full chemical protection suit for large fires
Special Procedures: Remove containers from fire zone if possible, avoid breathing fumes, cool adjacent containers with water spray, approach from upwind
Flashpoint: Not applicable for solids under normal conditions
Precautions: Evacuate nonessential personnel, ventilate area, restrict access
Personal Protection: Chemical-resistant gloves, safety goggles, dust mask or respirator (P2 or N95 minimum), lab coat or coveralls
Containment: Prevent entry into drains, sewers, and waterways, collect with non-sparking equipment
Cleanup Methods: Sweep up carefully with minimum dust generation and place in labeled, sealed container for disposal, use damp cloth for fine residues
Decontamination: Wash spill site with detergent and water after material pick-up
Handling: Use only in well-ventilated areas, keep container tightly closed, do not eat, drink, or smoke during handling, avoid dust creation, wash skin thoroughly after handling
Storage: Store in tightly sealed, correctly labeled containers, away from incompatible materials like acids and strong oxidizers, keep in cool, dry, well-ventilated place protected from moisture and direct sunlight
Incompatibilities: Strong acids, oxidizers, reducing agents
Storage Class: Toxic solids, inorganic
Shelf Life: Two years under proper storage conditions
Occupational Exposure Limit: OSHA PEL for selenium compounds: 0.2 mg/m³ (as Se)
Engineering Controls: Use chemical fume hood, local exhaust system, maintain minimum airborne concentrations
Personal Protective Equipment: Nitrile gloves, impervious apron, tightly fitted safety goggles
Respiratory Protection: Approved particulate respirator for nuisance dust, half-face mask for moderate exposure, full-face respirator or supplied air system for high concentrations
Hygiene Measures: Change contaminated clothing quickly, do not allow to remain on skin, wash hands and face before breaks or leaving work area
Appearance: White to off-white powder or crystalline solid
Odor: Odorless or faint metallic odor
Melting Point: Approximately 190°C (decomposes)
Boiling Point: Not applicable (decomposes before boiling)
Density: 2.1 g/cm³ (estimated)
pH: 5.0–6.0 (1% solution)
Solubility: Freely soluble in water
Vapor Pressure: Negligible
Flash Point: Not applicable
Auto-Ignition Temperature: Data not available
Chemical Stability: Stable under recommended storage conditions, decomposes on heating
Reactivity: Reacts with strong acids to liberate toxic selenium oxides, incompatible with oxidizing and reducing agents
Hazardous Reactions: Evolution of toxic fumes under fire or excessive heat
Decomposition Products: Selenium dioxide, carbon oxides, unidentified organic fragments
Polymerization: No known hazardous polymerization
Conditions to Avoid: High temperature, exposure to air and moisture, contact with incompatible substances
Acute Toxicity: Oral LD50 (rat): estimated 7 mg/kg (as selenium)
Inhalation: Irritation to respiratory tract, dizziness, severe coughing, potential for fatality at high exposure
Skin Contact: Toxic by absorption, possible allergic reactions, skin irritation
Eye Contact: Severe irritation, eye damage possible
Chronic Effects: Prolonged exposure leads to selenosis: symptoms include hair loss, dental changes, nail deformations, nervous system disorders
Sensitization: Reports of allergenic potential
Carcinogenicity: Not listed as carcinogenic by NTP, IARC, or OSHA
Additional Information: May cause mutations and reproductive harm at high concentrations
Aquatic Toxicity: Highly toxic to aquatic organisms, estimated LC50 (fish): 1–10 mg/L
Persistence and Degradability: Not readily biodegradable, selenium compounds may persist in soil and water
Bioaccumulation: Potential to accumulate in aquatic biota, biomagnification through food chain
Mobility in Soil: Moderate, may leach through water pathways
Other Adverse Effects: Can impact soil microflora, risk of long-term environmental damage if released in significant quantities
Waste Disposal: Handle as hazardous waste, follow federal, state, and local regulations, send to licensed chemical disposal facility
Container Disposal: Triple rinse, puncture, and offer for recycling or reconditioning if allowed by local requirements
Handling Precautions: Do not dump into drains, waterways, or soil
Waste Codes: Assign US EPA hazardous waste number for selenium compounds: D010
UN Number: 3283 (for inorganic selenium compounds)
Proper Shipping Name: Toxic solid, inorganic, n.o.s. (contains selenium citrate)
Transport Hazard Class: 6.1 (toxic substances)
Packing Group: II
Labels Required: Toxic substance, environmentally hazardous
Special Precautions: Avoid temperature extremes, ensure secondary containment, mark all packaging appropriately
Environmental Hazards: Marine pollutant
Transport in Bulk: Follow IMDG, IATA, DOT transport codes for hazardous materials
TSCA: Listed on the US Toxic Substances Control Act inventory
SARA Title III: Section 313 listed toxic chemical (selenium compounds)
California Proposition 65: Not listed
EU Regulation: Complies with REACH—notification and safety assessment required
Canadian WHMIS: Included under Class D2A (very toxic material) and D2B (toxic moderate)
Other National Regulations: Vary by country—refer to local guidelines for worker and environmental protection
Restrictions: For research or manufacturing use only, subject to labeling and documentation
