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Product Name: Potassium Nitrite
Chemical Formula: KNO2
Synonyms: Nitrous acid, potassium salt; E249
CAS Number: 7758-09-0
Use: Preservative, corrosion inhibitor, laboratory reagent
Manufacturer: Refer to packaging for supplier or local distributor
Contact for Emergency: Local poison control center or emergency services
Classification: Oxidizing solid (Category 3); Acute toxicity, oral (Category 3)
Label Elements: Danger, skull and crossbones, oxidizing circle
Primary Hazards: Highly toxic if swallowed, oxidizer, may intensify fire, harmful if inhaled, can cause severe irritation to skin, eyes, and respiratory tract
Precautionary Statements: Avoid contact with skin and eyes, do not ingest, keep away from combustible materials, use proper ventilation
Substance: Potassium Nitrite
Common Purity: 98–100%
CAS Number: 7758-09-0
Hazardous Components: None additional, contains single ingredient
Inhalation: Move individual to fresh air, monitor for breathing difficulties, seek immediate medical help if symptoms persist
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with running water, consult medical care for persistent irritation
Eye Contact: Rinse eyes gently with water for several minutes while holding eyelids open, remove contact lenses if present, continue rinsing, call poison control or physician
Ingestion: Do not induce vomiting, rinse mouth with water, never give fluids to someone who is unconscious, seek emergency medical attention right away
Suitable Extinguishing Media: Water spray, foam. Avoid using dry chemical or carbon dioxide on large fires due to risk of spreading oxidizer
Specific Hazards: Substance supports combustion by releasing oxygen, emits toxic and irritating fumes (nitrogen oxides and potassium oxides) in fire
Protective Equipment: Firefighters should use self-contained breathing apparatus and full protective gear
Firefighting Advice: Cool containers with water spray, remove from fire area if safe, stay upwind of fire, keep run-off water out of sewers and waterways
Personal Precautions: Wear chemical-resistant gloves, protective goggles, suitable clothing, use respiratory protection for large spills or dust
Environmental Precautions: Prevent release into drains, surface and groundwater. Isolate spill area
Methods for Cleanup: Sweep up material carefully to prevent dust, collect in suitable containers for proper disposal, ventilate area, wash residue with plenty of water
Handling: Avoid breathing dust, prevent contact with skin, eyes, and clothing, wash hands thoroughly after handling, keep away from heat and sparks, never eat, drink, or smoke when working with product
Storage: Store in tightly closed containers, in a cool and dry area, separate from combustible and organic materials, acids, and reducing agents, do not store near food or feed, ensure containment and security to prevent unauthorized access
Exposure Limits: ACGIH TLV: 0.2 mg/m3 (as nitrite, inhalable fraction, skin)
Engineering Controls: Proper ventilation, fume hood, eyewash stations, emergency showers
Personal Protective Equipment: Approved respirators for dust, chemical-resistant gloves (nitrile, neoprene), splash-proof goggles, laboratory coat, closed footwear
Hygienic Practices: Remove contaminated clothing, wash hands before breaks and after finishing tasks
Appearance: Pale yellow crystalline solid
Odor: Odorless
Melting Point: 441 °C
Boiling Point: Decomposes before boiling
Solubility: Soluble in water, insoluble in alcohol
Density: 1.91 g/cm3
pH: Approximately 8.3 (50 g/L at 20 °C aqueous solution)
Vapor Pressure: Negligible at room temperature
Flash Point: Not applicable (not flammable)
Autoignition Temperature: Not self-igniting
Explosive Properties: Not explosive, but enhances combustion of other materials
Stability: Stable under normal conditions, sensitive to moisture and strong heat
Conditions to Avoid: Exposure to high temperature, shock, friction, contamination with combustible material
Incompatible Materials: Strong acids, reducing agents, organic materials, ammonium salts, powdered metals, sulfur, oxidizable substances
Hazardous Decomposition: Releases toxic nitrogen oxides and potassium oxides on heating
Hazardous Polymerization: Will not occur
Acute Toxicity: Highly toxic if swallowed, LD50 (oral, rat): 180 mg/kg
Routes of Exposure: Ingestion, inhalation, skin and eye contact
Symptoms: Nausea, vomiting, headache, dizziness, methemoglobinemia (may impair blood’s ability to carry oxygen), rapid heartbeat, cyanosis, respiratory distress, shock
Chronic Exposure: Potential for kidney and blood effects with repeated exposure, no substantial evidence of carcinogenicity
Target Organs: Blood, respiratory system, kidneys
Other Information: People with preexisting blood disorders could be more sensitive to toxic effects
Aquatic Toxicity: Toxic to aquatic wildlife, risk of eutrophication in water bodies
Persistence and Degradability: Compound dissociates to potassium and nitrite ions, nitrite can oxidize to nitrate in environment
Bioaccumulative Potential: Low for potassium, nitrite does not bioaccumulate
Mobility: High solubility, migrates easily in water
Other Effects: Nitrites pose direct toxicity to fish and invertebrates; monitor discharges to avoid environmental contamination
Waste Handling: Handle as hazardous chemical waste, do not dispose of in household garbage or sewer
Disposal Method: Transfer in sealed, labeled containers for proper treatment or incineration by licensed waste contractor, consult local authorities for specific guidance
Container Disposal: Completely empty containers before recycling or disposal, triple rinse with water, puncture and dispose in accordance with regulations
Regulatory Notice: Disposal methods and requirements may vary by region; follow local, state, and national regulations
UN Number: UN1488
Shipping Name: Potassium Nitrite
Hazard Class: 5.1 (Oxidizer)
Packing Group: II
Labeling: Oxidizer, Toxic
Marine Pollutant: No, but avoid bulk marine release
Special Precautions: Keep containers tightly closed and away from incompatible materials and direct sun, protect from physical damage, ensure transport staff trained for chemical spills and incidents
OSHA Status: Hazardous by definition of Hazard Communication Standard
TSCA: Listed
SARA Title III: Subject to reporting under Sections 302, 304, and 313 for acute health hazard, fire hazard, sudden release, reactive hazard
EU Regulation: Classified as dangerous, subject to REACH Annex XVII restrictions
WHMIS Classification: Class C (Oxidizing Material), Class D1A (Very Toxic Material)
Other Regulations: Covered under various national transport and chemical control acts, possession and use may require permits in some jurisdictions
Label Elements Required: Danger/Poison, strictly regulated use, supervision, and accident preparedness necessary in occupational environments
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
