MSDS for Selenocysteine

Identification

Product Name: Selenocysteine
Chemical Formula: C3H7NO2Se
Synonyms: Seleno-L-cysteine, SeCys
CAS Number: 1464-34-8
Recommended Use: Laboratory research, biochemical studies
Supplier: [Company Information Placeholder]
Emergency Phone: [To be filled based on supplier]
Contact Email: [To be filled based on supplier]

Hazard Identification

GHS Classification: Acute toxicity (oral, dermal, inhalation), Eye irritation, Skin corrosion/irritation
Hazard Pictograms: Skull and crossbones, Exclamation mark
Signal Word: Danger
Hazard Statements: Toxic if swallowed; harmful in contact with skin; causes skin and eye irritation; toxic to aquatic life
Precautionary Statements: Avoid breathing dust or vapors; wear protective gloves; wash hands thoroughly after handling; avoid release to the environment; use personal protective equipment as required

Composition / Information on Ingredients

Name: Selenocysteine
Concentration: ≥98% by weight
CAS Number: 1464-34-8
Impurities: Not expected to be hazardous at reported concentrations
Other Ingredients: None identified relevant for safety

First Aid Measures

Inhalation: Move individual to fresh air, assist breathing as needed, seek medical attention for persistent symptoms
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water for several minutes, seek advice if irritation develops
Eye Contact: Rinse eyes gently with water for at least 15 minutes, keep eyelids open, seek medical attention quickly
Ingestion: Rinse mouth, do not induce vomiting unless instructed by medical personnel, get medical help immediately
Most Important Symptoms: Irritation, redness, shortness of breath, gastric pain, potentially confusion or headache if overexposed
Immediate Medical Attention: Necessary for significant exposure or persistent symptoms

Fire-Fighting Measures

Suitable Extinguishing Media: Water spray, dry chemical powder, foam, or carbon dioxide
Unsuitable Extinguishing Media: Do not use high-pressure water streams
Specific Hazards: Hazardous combustion products include selenium oxides, nitrogen oxides, carbon monoxide; toxic and corrosive fumes
Protective Equipment: Firefighters should use self-contained breathing apparatus and full protective gear
Special Procedures: Move containers away from fire area if safe, avoid inhalation of combustion products

Accidental Release Measures

Personal Precautions: Use chemical-resistant gloves, protective clothing, and safety goggles
Environmental Precautions: Prevent release into soil, waterways, and drains; Selenocysteine is toxic to aquatic life
Methods for Cleanup: Sweep up without generating dust, collect spilled material in suitable containers, clean area with water and detergent
Other Precautions: Ensure proper ventilation, isolate area from unprotected personnel, dispose of in compliance with regulations

Handling and Storage

Handling: Use only in well-ventilated areas, avoid dust and contact with skin or eyes, keep away from sources of ignition, do not eat or drink while handling
Storage Conditions: Store in cool, dry place, keep container tightly closed, protect from moisture and incompatible substances
Incompatible Materials: Strong acids, oxidizers, alkali metals
Safe Packaging: Use original container or chemically compatible packaging, ensure label remains intact and legible

Exposure Controls and Personal Protection

Engineering Controls: Use local exhaust ventilation, safety showers, eyewash stations
Personal Protective Equipment: Chemical-resistant gloves (nitrile or neoprene), lab coat, protective goggles, respiratory protection if ventilation inadequate
Hygiene Measures: Wash thoroughly after handling, do not take contaminated equipment home, keep work surfaces clean
Occupational Limits: No specific exposure limits set for Selenocysteine; minimize exposure as with all selenium compounds

Physical and Chemical Properties

Physical State: Solid
Color: White to off-white crystalline powder
Odor: Odorless
Molecular Weight: 168.06 g/mol
Melting Point: Not fully characterized; decomposes before melting
Solubility: Soluble in water; insoluble in organic solvents
pH: Neutral to slightly acidic in aqueous solution
Vapor Pressure: Negligible at room temperature
Boiling Point: Not applicable
Flash Point: Not applicable
Explosion Limits: No data available
Partition Coefficient: Log Pow not established
Auto-ignition Temperature: Not determined

Stability and Reactivity

Chemical Stability: Stable under normal storage and use conditions
Hazardous Reactions: Reacts with strong oxidizing agents, acids, and alkali metals
Conditions to Avoid: Excessive heat, moisture, prolonged exposure to air
Decomposition Products: Selenium oxides, nitrogen oxides, carbon oxides
Polymerization: No risk under normal storage and usage

Toxicological Information

Routes of Exposure: Inhalation, ingestion, skin and eye contact
Acute Toxicity: Toxic if swallowed, low dermal toxicity, may cause gastric distress, headache, confusion
Chronic Effects: Chronic exposure to selenium compounds may cause selenosis, symptoms include gastrointestinal upset, hair and nail loss, garlic breath odor, neurological symptoms
Skin/Eye Irritation: Causes irritation to skin and eyes
Carcinogenicity: Not classified as a carcinogen by IARC, NTP, or OSHA
Mutagenicity/Reproductive Toxicity: No specific data, selenium compounds have potential for toxicity with prolonged exposure

Ecological Information

Toxicity to Aquatic Organisms: Highly toxic to fish and aquatic invertebrates
Persistence and Degradability: Likely biodegradable, but selenium may bioaccumulate in aquatic environments
Bioaccumulative Potential: Selenium can accumulate in food chains, presenting long-term ecological risk
Mobility in Soil: May leach to ground water through soil depending on local conditions
Environmental Precautions: Avoid spillage and runoff; clean up promptly to prevent environmental contamination

Disposal Considerations

Waste Treatment Methods: Treat as hazardous waste by local, regional, and national regulations
Disposal Containers: Use sealed, chemically compatible containers for waste material
Residual Waste: Avoid release of unused or contaminated material into environment; residues must be treated as hazardous
Disposal of Packaging: Decontaminate containers before recycling or disposal, or dispose as hazardous waste if not cleaned

Transport Information

UN Number: Not classified under UN for transport purposes
Transport Hazard Class: Not regulated for transport under ADR/RID/IMDG/IATA
Packing Group: Not assigned
Special Precautions: Keep container tightly sealed, avoid damage during transport, handle with appropriate PPE if spillage occurs
Environmental Hazards: Toxic to aquatic life, prevent leakage into environment in case of accident

Regulatory Information

TSCA Status: Listed or exempt
REACH Status: Registration not required for research and development quantities
OSHA: No specific standard, handle as a laboratory chemical
SARA Title III: Not a Section 313 listed chemical, but selenium compounds listed as hazardous
California Proposition 65: Not listed
Other National/Regional Regulations: Handle as a hazardous substance per local, state, or national requirements