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Chemical Name: Sulfur Dioxide
Synonyms: Sulphur dioxide, sulfurous anhydride
Chemical Formula: SO2
CAS Number: 7446-09-5
Recommended Use: Preservative, disinfectant, bleaching agent, intermediate in chemical manufacturing
Supplier: Information provided by manufacturer or distributor
Emergency Contact: Available through CHEMTREC or local emergency numbers
GHS Classification: Acute toxicity, inhalation (Category 3), Skin corrosion/irritation (Category 2), Serious eye damage/eye irritation (Category 2A), Specific target organ toxicity single exposure—respiratory tract irritation (Category 3)
Signal Word: Danger
Hazard Statements: Toxic if inhaled, causes severe skin burns and eye damage, may cause respiratory irritation
Pictograms: Corrosive, Health hazard, Exclamation mark
Precautionary Statements: Avoid breathing fumes, use only with strict ventilation, wear protective equipment, wash hands thoroughly after handling, store locked up
Other Hazards: Compressed gas may explode if heated, strong irritant, possible asphyxiant in confined spaces
Chemical Identity: Sulfur Dioxide
Concentration: 99-100%
Other Components: No significant impurities known
Formula: SO2
Inhalation: Move person to fresh air immediately, keep at rest, administer oxygen if breathing is difficult, contact emergency services without delay
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with water for 15 minutes, seek medical attention if irritation continues
Eye Contact: Rinse cautiously with water for at least 15 minutes, hold eyelids open, contact an eye specialist right away
Ingestion: Do not induce vomiting, rinse mouth carefully, get urgent medical help
Key Symptoms: Coughing, choking, difficulty breathing, eye watering, skin redness, chemical burns
Suitable Extinguishing Media: Use water spray, dry chemical, carbon dioxide for surrounding materials—sulfur dioxide itself does not burn
Protective Equipment: Use self-contained breathing apparatus and full protective suit
Special Hazards: Gas may react with water to form sulfurous acid, toxic and irritating fumes given off at high temperatures
Specific Methods: Move cylinders away from fire if this can be done safely, cool fire-exposed containers with water spray
Personal Precautions: Evacuate non-essential personnel, ventilate the area, use suitable respiratory protection
Environmental Precautions: Prevent gas from entering drains, sewers, basements
Methods for Cleanup: Isolate leak if safe, use water spray to disperse vapor, absorb spilled liquid with inert materials, collect and dispose according to regulations
Handling: Handle inside chemical fume hood or well-ventilated space, avoid any contact with eyes, skin, or clothing, use only with properly trained operators, never smoke or use ignition sources near product
Storage: Store cylinders upright, tightly closed, and properly labeled in cool, dry, well-ventilated area away from incompatible materials (alkalis, water, oxidizers), protect from physical damage and direct sunlight, ensure storage location allows for rapid emergency removal
Occupational Exposure Limits: OSHA PEL 5 ppm TWA (13 mg/m3), ACGIH TLV 0.25 ppm TWA
Engineering Controls: Use process enclosures, local exhaust ventilation, or other engineering controls to control airborne levels
Personal Protection: Wear chemical safety goggles and faceshield, acid-resistant gloves and apron, long sleeves, NIOSH-approved full-face respirator with acid gas cartridges or supplied-air respirator for high concentrations
Hygiene Measures: Wash hands thoroughly after handling, keep work clothing separate, remove contaminated clothing immediately
Appearance: Colorless gas, sharp suffocating odor resembling burning match
Odor Threshold: 0.67 ppm
pH: Acidic when dissolved in water
Melting Point: -72.7°C
Boiling Point: -10°C
Flash Point: Non-flammable
Vapor Pressure: 3,300 mm Hg at 21°C
Solubility: Highly soluble in water
Density: 2.926 kg/m3 at 25°C
Molecular Weight: 64.06 g/mol
Vapor Density: 2.2 (air=1)
Chemical Stability: Stable under normal conditions and recommended use
Reactivity: Reacts violently with water, alkali, or oxidizing agents
Hazardous Decomposition: Sulfur oxides, toxic fumes
Polymerization: Will not occur
Incompatible Materials: Moisture, strong bases, strong oxidizers, certain metals such as potassium, sodium
Routes of Entry: Inhalation, eye, skin contact
Acute Effects: Severe respiratory tract irritation, chest pain, airway constriction, skin burns, severe eye burns, risk of pulmonary edema
Chronic Effects: Prolonged exposure linked to asthma-like symptoms, chronic bronchitis, teeth erosion
Sensitization: No reliable evidence for respiratory or skin sensitization
LD50 (oral-rat): Not applicable (gas)
LC50 (inhalation-rat): 2520 ppm/1 hr
Carcinogenicity: No evidence in humans (IARC Group 3)
Environmental Impact: Harmful to aquatic organisms in high concentrations, lowers pH of water bodies, acidifies soils due to deposition from air
Persistence: Rapidly reacts with moisture to form sulfurous acid, subject to photolytic breakdown
Bioaccumulation: Not expected to bioaccumulate in organisms
Mobility in Soil: High mobility due to gaseous state and solubility in water
Other Adverse Effects: Strong contributor to acid rain and related ecological damage
Waste Treatment Methods: Dispose of via licensed waste disposal contractor following national, regional, and local hazardous waste laws
Contaminated Packaging: Decontaminate containers before recycling or disposal, return cylinders to supplier if possible
Precautions: Avoid release to environment, neutralize dissolved gas before discharge
UN Number: UN1079
Proper Shipping Name: Sulfur Dioxide
Transport Hazard Class: 2.3 (gas, toxic), 8 (corrosive)
Packing Group: Not assigned (compressed gas)
Labels Required: Toxic Gas, Corrosive
Special Precautions: Secure cylinders upright, protect from heat and physical damage, transport under DOT, IMDG, and IATA rules
OSHA: Regulated hazardous substance
EPA: Listed under Clean Air Act as hazardous air pollutant, subject to reporting under SARA Title III Section 302/304/313
TSCA: Listed substance
EU REACH: Registered, subject to use restrictions due to health, environmental hazards
WHMIS: Classified under Class A (Compressed Gases), Class D1A (Very Toxic), and Class E (Corrosive)
Other: State and local regulations may apply; always consult current rules
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
