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Product Name: Ammonium Bisulfite
Chemical Formula: NH4HSO3
Synonyms: Ammonium hydrogen sulfite, Ammonium acid sulfite
CAS Number: 10192-30-0
Recommended Use: Oxygen scavenger, water treatment, photographic chemical, pulp and paper processing
Supplier: Contact local or national manufacturers for supplier details
Emergency Contact Number: Local Poison Center or Emergency Services
GHS Classification: Acute toxicity, Category 4; Skin irritation, Category 2; Eye irritation, Category 2A
Pictograms: Exclamation mark
Signal Word: Warning
Hazard Statements: Harmful if swallowed, causes skin and eye irritation, may cause respiratory tract irritation, releases sulfur dioxide gas which can aggravate asthma and breathing issues
Precautionary Statements: Avoid contact with skin and eyes, avoid inhalation of fumes or mist, wash thoroughly after handling, keep containers tightly closed
Chemical Name: Ammonium Bisulfite
Concentration: 60% (typical commercial solution), balance water
CAS Number: 10192-30-0
Impurities: May include low percentages of sodium bisulfite or ammonia as byproducts depending on production method
Inhalation: Move individual to fresh air, keep at rest, provide oxygen if breathing is difficult, seek medical attention for persistent respiratory symptoms
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water, seek medical help if irritation develops
Eye Contact: Rinse cautiously with water for fifteen minutes, remove contact lenses, seek immediate medical advice if pain or redness persists
Ingestion: Rinse mouth, do not induce vomiting, give water to drink if conscious, get prompt medical attention
Suitable Extinguishing Media: Use water spray, foam, dry chemical, or carbon dioxide
Hazards: Thermal decomposition releases irritating and toxic gases such as sulfur oxides, ammonia, and nitrogen oxides
Special Protective Equipment: Firefighters should wear self-contained breathing apparatus and full protective gear
Advice: Keep non-emergency personnel away, avoid runoff from fire control contaminating drains or waterways
Personal Precautions: Evacuate area, ventilate, use personal protective equipment including gloves, goggles, and respirator
Environmental Precautions: Prevent spillage from entering drains, surface, or ground water
Methods for Cleanup: Absorb spill with inert material like sand, transfer to labeled waste container, neutralize residue with alkaline material such as lime or soda ash, flush area with water
Handling: Use in well-ventilated areas, avoid breathing vapors or mist, avoid contact with skin and eyes, practice good hygiene by washing exposed skin
Storage: Store in a cool, dry, well-ventilated place, keep containers tightly closed, separate from acids and oxidizing agents, protect from heat and physical damage
Incompatible Materials: Do not store near strong acids or oxidizers, reacts strongly with chlorine and hypochlorites
Exposure Limits: OSHA or ACGIH have not established specific limits for ammonium bisulfite; use limits for sulfur dioxide as a guideline (ACGIH TLV: 2 ppm TWA)
Engineering Controls: Use local exhaust ventilation or process enclosure to minimize exposure
Personal Protection: Wear chemical-resistant gloves (nitrile or neoprene), safety goggles, lab coat or apron, and appropriate respiratory protection in case of insufficient ventilation
Hygiene Measures: Do not eat, drink, or smoke during use, wash hands after handling, remove contaminated clothing promptly and launder
Appearance: Colorless to pale yellow solution
Odor: Strong sulfur dioxide odor
pH: 4.0–5.5
Boiling Point: Above 100°C (solution)
Melting Point: Not applicable to solution, decomposes before melting
Solubility: Completely soluble in water
Specific Gravity: Around 1.3–1.4 (20°C)
Vapor Pressure: Not available for solution
Decomposition Temperature: Releases sulfur dioxide on heating
Flash Point: Not flammable
Evaporation Rate: Not established
Partition Coefficient: Not available
Viscosity: Similar to water
Chemical Stability: Stable under recommended conditions, sensitive to heat and light
Hazardous Reactions: Reacts with acids, releasing highly toxic sulfur dioxide gas
Hazardous Decomposition Products: Sulfur dioxide, ammonia, nitrogen oxides
Incompatible Materials: Strong acids, oxidizers, hypochlorites, strong bases may cause violent reactions
Polymerization: Not expected
Acute Toxicity: Oral LD50 (rat): 2000–2500 mg/kg
Inhalation: Prolonged exposure to vapors or mists can cause respiratory tract irritation, symptoms may include coughing, shortness of breath, sore throat
Skin Contact: May cause irritation, redness, and inflammation
Eye Contact: Causes pain, redness, and watering
Chronic Effects: Repeated exposure may produce skin sensitization; persons with asthma or respiratory conditions may be aggravated
Carcinogenicity: Not classified by IARC, NTP, or OSHA
Mutagenicity/Reproductive Toxicity: Not expected based on available information
Aquatic Toxicity: Harmful to aquatic life at high concentrations, can lower oxygen availability in water
Persistence and Degradability: Breaks down in the environment, but large releases can disrupt natural pH balances
Bioaccumulative Potential: Not expected to bioaccumulate
Mobility in Soil: Highly soluble, can migrate in water systems
Other Adverse Effects: Large spills may cause fish kills and affect microflora
Waste Disposal Methods: Treat and neutralize with alkaline substances before discharge, follow national, regional, or local regulations for disposal, avoid release into sewer systems or surface water
Container Disposal: Rinse thoroughly, remove labels, puncture and recycle or dispose of containers as hazardous waste depending on local laws
UN Number: 2693
Proper Shipping Name: Ammonium bisulfite solution
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: III
Labels: Corrosive
Special Precautions: Avoid mixing with oxidizers during transport, secure load to prevent spills, emergency responders should be trained on handling spills during transit
U.S. Regulation: Listed on TSCA inventory, subject to EPA SARA Title III reporting for large quantities
OSHA Status: Hazardous chemical
EU Regulation: Classified as dangerous according to EC directives, require appropriate hazard and precautionary labeling
Other International: Complies with Canada DSL/NDSL, Australia AICS, China IECSC
Workplace Controls: Employers must provide training and make MSDS available for all exposed staff
