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Name: Ammonium Sulfide
Chemical Formula: (NH4)2S
Common Forms: Colorless to yellowish liquid, strong odor
Uses: Laboratory reagent, chemical manufacturing, leather processing, textile treatment
Known Synonyms: Diammonium sulfide, ammonia sulfide
Appearance/Odor: Transparent or yellow fluid, sharp rotten egg smell due to hydrogen sulfide
Hazard Classification: Toxic if inhaled or swallowed, causes burns, flammable in presence of an ignition source
Main Health Risks: Harmful by inhalation, severe eye and skin irritation, risk of respiratory distress, risk of chemical burns
Pictogram Categories: Corrosive, Toxic, Flammable
Environmental Hazards: Aquatic toxicity from sulfur compounds
Routes of Exposure: Skin contact, breathing vapors, ingestion
Immediate Effects: Burning sensation, coughing, eye tearing, difficulty breathing
Delayed Effects: Potential for lung injury or chemical pneumonia
Main Ingredient: Ammonium Sulfide (CAS 12135-76-1)
Typical Purity: Between 20% and 40% in commercial solutions
Relevant Impurities: Ammonia, hydrogen sulfide
Physical State: Usually dissolved in water for stability
Inhalation: Move affected person outdoors quickly, seek immediate medical attention for breathing difficulty, keep airway clear
Skin Contact: Rinse skin thoroughly with running water, remove contaminated clothing, do not apply ointments before seeing a doctor
Eye Contact: Rinse eyes with gentle water flow for at least 15 minutes, keep eyelids apart, get medical help if irritation persists
Ingestion: Rinse mouth, do not induce vomiting, seek prompt attention from a physician
Symptoms to Watch: Trouble breathing, burns on skin, severe eye discomfort, nausea, headache
Suitable Extinguishing Media: Carbon dioxide, dry powder, water spray (small fires)
Combustion Hazards: Releases toxic gases, mainly ammonia and hydrogen sulfide
Special Protective Equipment: Chemical splash suit, self-contained breathing apparatus recommended for responders
Firefighting Precautions: Approach fires from upwind, avoid breathing fumes, cool containers with water spray
Explosion Risks: Vapors can form explosive mixtures with air, especially in confined spaces
Personal Precautions: Evacuate area, ventilate, wear protective clothing and respiratory protection
Environmental Precautions: Avoid release into drains, surface water, or soil to prevent contamination
Methods for Clean-Up: Absorb with earth or sand, shovel into closed containers, ventilate enclosed spaces after clean-up
Decontamination: Wash area with copious amounts of water, avoid unprotected personnel
Handling Practices: Work in well-ventilated areas, avoid inhalation of vapors, use protective gloves and goggles
Storage Needs: Store in tightly closed, corrosion-resistant containers, keep cool and away from incompatible substances like acids or oxidizers
Segregation: Keep out of sunlight or heat sources, separate from food and potable water supplies
Spillage Consideration: Keep an absorbent material nearby, maintain spill kits designed for corrosive and toxic chemicals
Exposure Limits: Values exist for hydrogen sulfide and ammonia, both highly toxic at low concentrations
Engineering Controls: Use local exhaust ventilation, monitor air quality in enclosed spaces
Personal Protective Equipment: Chemical-resistant gloves (nitrile, neoprene), splash-proof goggles, face shields, long-sleeved clothing, proper respirators for high vapor concentrations
Workplace Practices: Change out of contaminated clothing immediately, wash hands before breaks or meals, do not eat or drink near chemical use
Appearance: Colorless to yellowish liquid
Odor: Strong rotten egg, pungent ammonia
Boiling Point: Above 40°C (solution); pure compound decomposes
Melting Point: Difficult to specify since it decomposes
Solubility: Highly soluble in water
pH: Strongly basic
Vapor Pressure: High at room temperature, vapors accumulate in closed containers
Other Features: May corrode metals, causes black tarnish on copper and silver
Chemical Stability: Decomposes to ammonia, hydrogen sulfide, and sulfur, especially on heating or in presence of acids
Reactivity: Vigorous reaction with acids, risks of release of toxic gases
Dangerous Interactions: Incompatible with oxidizers, acids, chlorinating agents
Hazardous Decomposition: Hydrogen sulfide, ammonia, possibly sulfur oxides
Shelf Life: Shorter than many chemicals, deteriorates faster in warm or moist storage
Main Health Hazards: Highly irritating or corrosive to eyes, respiratory system, and skin
Acute Toxicity: Inhalation leads to coughing, headaches, drowsiness, and in severe cases, unconsciousness or death from respiratory failure
Oral Exposure: Vomiting, abdominal pain, risk of chemical burns to esophagus and stomach
Chronic Exposure Risks: Possible risk of long-term lung or kidney changes, especially at low-level repeated exposure
Sensitization: Not commonly reported, but can worsen respiratory conditions like asthma
Aquatic Toxicity: Harmful to aquatic organisms due to ammonia and sulfur compounds, risk of fish and invertebrate mortality
Persistence: Breaks down slowly in environment, but breakdown products can also be toxic
Bioaccumulation: Unlikely, but local contamination can have serious effects on small ecosystems
Soil Impact: Alters pH, can linger in groundwater, affects plant growth
Waste Treatment: Neutralize with acid in controlled and ventilated setting, dilute and flush to approved, licensed chemical disposal
Packaging Disposal: Wash empty containers thoroughly before discarding or recycling, avoid rinsing into open waterways
Legal Compliance: Follow local and national regulations regarding hazardous waste
Shipping Risks: Classified as hazardous for road, rail, sea, and air transport due to toxicity, corrosivity, and flammability
Container Integrity: Ship in sealed, corrosion-resistant non-glass vessels
Spillage Precaution: Carry spill containment materials, restrict access in event of accidental release during transit
Labeling: Mark with toxic and corrosive hazard signs
Chemical Control: Regulated as a toxic, corrosive, and environmentally dangerous substance in many jurisdictions
Reporting Requirements: Notification in case of spills over reportable quantities, especially near waterways or inhabited areas
User Obligations: Ensure staff are trained on hazards and emergency response, maintain safety documentation
Restrictions: Use may be restricted near sensitive sites such as schools, hospitals, water reserves
