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Chemical Name: N,N-Dimethylselenourea
Synonyms: Dimethylselenourea
Molecular Formula: C3H8N2Se
Appearance: Typically presents as a crystalline powder, often white to off-white in color
Odor: Slight, reminiscent of amine compounds
Recommended Uses: Specialty chemical intermediate, research applications in organic synthesis
Restrictions: Not intended for food, drug, or household use
Relevant Identifiers: CAS number, if available, is sometimes used in regulatory contexts
GHS Classification: Acute toxicity (oral, dermal, inhalation); environmental hazard due to selenium content
Signal Word: Danger
Hazard Statements: Toxic if swallowed; toxic in contact with skin; harmful if inhaled; may cause irritation of eyes, skin, and respiratory tract; potential environmental threat to aquatic life
Symptoms of Exposure: Nausea, headache, dizziness, irritation of eyes or respiratory passages, metallic taste, selenosis with chronic overexposure
Pictograms: Skull and crossbones indicating acute toxicity
Precautionary Statements: Avoid breathing dust; use only with adequate ventilation; avoid release to environment
Main Constituent: N,N-Dimethylselenourea
Content: Greater than 98% in pure preparations
Impurities: Typical trace byproducts from synthesis may include minor organoselenium species
Contaminants: Not usually present above trace levels when repeatedly recrystallized
Inhalation: Move the affected person to fresh air without delay; if breathing is difficult, provide supplemental oxygen and consult a physician
Ingestion: Rinse mouth thoroughly; do not induce vomiting unless instructed by medical personnel; seek immediate medical attention
Skin Contact: Remove contaminated clothing; flush skin with plenty of water and soap for at least fifteen minutes; medical attention advised for irritation or persistent symptoms
Eye Contact: Flush eyes gently but thoroughly with water for several minutes, lifting upper and lower eyelids; seek prompt evaluation by an eye specialist if irritation persists
Major Symptoms to Watch: Headache, weakness, nausea, potential eye damage, skin rashes
Suitable Extinguishing Media: Use dry chemical powder, carbon dioxide, or foam
Unsuitable Media: Water streams may increase spread of contamination
Hazards from Combustion: Can produce toxic selenium oxides and nitrogen oxides when burned
Protective Actions: Firefighters wear self-contained breathing apparatus and full protective clothing
General Guidance: Evacuate area, prevent contaminated runoff if possible
Personal Precautions: Evacuate unnecessary personnel; wear gloves, goggles, lab coat, dust mask or respirator
Environmental Precautions: Avoid release into sewers, waterways, or soil; selenium compounds pose ecological risks
Containment Methods: Scoop up spillage using tools that minimize dust formation; clean area with damp disposable materials
Disposal: Collect residue and used cleanup materials in sealed, labeled containers for hazardous waste disposal
Safe Handling: Use only in well-ventilated areas or fume hoods; minimize skin and inhalation exposure with proper PPE
Storage Conditions: Store tightly sealed in clearly labeled containers, away from incompatible chemicals
Temperature and Light Sensitivity: Keep out of direct sunlight; optimal storage at cool, stable temperatures
Incompatibilities: Strong acids, strong oxidizers can trigger dangerous reactions
Engineering Controls: Use chemical fume hoods and local exhaust to keep airborne levels low
Personal Protective Equipment: Nitrile gloves, chemical splash goggles, long-sleeved protective garment, approved respirators in case of dust generation
Workplace Hygiene: Wash hands after handling and before eating or drinking; do not eat, drink, or smoke near work area
Exposure Limits: Specific occupational exposure numbers for selenium compounds set by agencies like OSHA or ACGIH; comply where applicable
Physical State: Solid, crystalline
Color: White to off-white
Smell: Slight, amine-like
Melting Point: Varies by sample, often in the range of 120-150°C
Solubility: Varies; moderate in water, more soluble in polar organic solvents
Stability: Stable at room temperature under normal conditions
Other Notables: Can deteriorate with prolonged light or heat exposure; dust capable of irritation if inhaled
Chemical Stability: Remains stable under ordinary laboratory conditions
Hazardous Reactions: Reacts with strong acids or oxidizers to give off toxic gases
Decomposition Products: Selenium oxides, nitrogen oxides upon heating or burning
Conditions to Avoid: Excessive heat, open flame, strong acidic or oxidizing environments
Acute Toxicity: Known to be toxic by oral, dermal, and inhalation routes
Symptoms of Acute Exposure: Irritation of mucous membranes, digestive upset, nausea, vomiting, weakness, headaches
Chronic Exposure Risks: Prolonged or repeated contact can cause selenosis, a condition marked by hair loss, nail deformation, nervous system effects
Carcinogenicity: Some organoselenium compounds are studied for potential carcinogenicity; there is not enough definitive evidence for this specific compound
Sensitization and Irritation: Skin and respiratory irritant; risk increases with dust and repeated exposure
Ecotoxicity: Threat to aquatic organisms due to selenium bioaccumulation
Aquatic Effects: Selenium can persist in water and build up in food chains affecting fish and other wildlife
Persistence: Does not rapidly degrade; risk of long-term contamination
Mobility: Water-soluble forms can migrate through soil to groundwater
Avoidance: Prevent discharge into natural waterways or soil
Preferred Method: Place in properly labeled containers and send to licensed hazardous waste incineration or treatment facility
Unacceptable Practice: Do not dump into sewer, surface water, or uncontrolled waste disposal
Compliant Procedures: Follow national and local regulations; record and document disposal actions
Shipping Status: Considered regulated due to toxicity
Packing Group: Generally treated as a substance of moderate hazard
Transport Hazards: Avoid shipment with oxidizers and acids; prevent rough handling
Labeling: Mark containers using required hazardous materials symbols
Spill Response in Transit: Use absorbent, seal in containers, arrange for appropriate cleanup
Global Reach: May fall under chemical control laws in jurisdictions such as Europe, United States, or other regions
Workplace Requirements: Use of substance must comply with health and safety standards such as OSHA in the US, or REACH in the EU
Environmental Restrictions: Limits often imposed on discharge concentrations for selenium into the environment
Personal Safety Regulation: Employers ensure PPE use, safety training, and documentation of use and disposal
