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Chemical Name: Dibenzothiophene
Chemical Formula: C12H8S
CAS Number: 132-65-0
Physical Description: Solid with white to pale yellow appearance, faint aromatic odor
Common Uses: Often appears in research, chemical synthesis, and as an impurity in fossil fuels
Synonyms: DBT
Hazard Classification: Dibenzothiophene falls into slightly hazardous categories for health and fire risk
Routes of Exposure: Inhalation of dust, direct skin, or eye contact
Symptoms: Can cause mild skin or eye irritation, respiratory discomfort with significant exposure to dust
Fire & Explosion Risk: Fine particles can potentially become combustible like many organic powders; larger crystals or pellets pose less of a concern
Risk Phrases: Irritating to eyes and respiratory tract; environmental hazards arise through persistence in water and soil
Dibenzothiophene: Pure material with over 99 percent active ingredient in laboratory contexts
Impurities: Small amounts of polycyclic aromatic hydrocarbons may occur if sourced from crude oil fractions
Eye Contact: Rinse thoroughly with plenty of water for several minutes, check for persistence of irritation
Skin Contact: Wash area with soap and water to remove possible residue, remove contaminated clothing
Inhalation: Move to fresh air, seek medical attention for respiratory symptoms
Ingestion: Rinse mouth, drink water, seek help if feeling unwell
Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide, water spray for cooling containers
Hazardous Combustion Products: Combustion can generate sulfur oxides and carbon oxides
Special Protective Equipment: Self-contained breathing apparatus and protective clothing in confined fires
Precautions: Keep dust levels down, avoid sources of ignition in storage and transit
Personal Precautions: Wear dust mask, safety glasses, gloves to avoid direct contact
Cleanup Methods: Scoop or sweep material, avoid raising dust, collect for proper disposal
Environmental Precautions: Prevent entry into waterways and soil; minimize loss to sewer systems
Handling: Avoid breathing dust, handle in well-ventilated spaces, keep containers tightly closed
Hygiene Guidelines: Wash hands after handling, keep workspaces free from food and smoking
Storage Conditions: Store in cool, dry, well-ventilated environment; separate from oxidizers and ignition sources
Engineering Controls: Local exhaust ventilation reduces airborne particles
Personal Protection: Dust mask or respirator for fine particles, safety goggles, chemical-resistant gloves
Workplace Monitoring: Regular checks for airborne particulates especially in processing areas
Appearance: Crystalline powder, white to pale yellow
Odor: Faint, aromatic
Melting Point: About 99°C
Boiling Point: Around 332°C
Solubility: Slightly soluble in water, more soluble in organic solvents
Vapor Pressure: Low under ambient conditions
Stability: Chemically stable under normal storage and handling conditions
Reactive Materials: Oxidizing agents, strong acids can initiate hazardous reactions
Hazardous Decomposition Products: Sulfur oxides, carbon oxides at elevated temperatures
Conditions to Avoid: High heating, contact with reactive chemicals
Acute Effects: Mildly irritating to eyes or skin, minimal oral toxicity reported
Chronic Effects: Some studies associate extended exposure to polycyclic sulfur-aromatic compounds with increased cancer risks in animal models
Inhalation Risk: Dust may trigger respiratory discomfort; limited direct toxicity in short exposures
Long-term Exposure: Environmental persistence raises questions, but acute effects remain relatively mild except in dust-rich settings
Persistence: Dibenzothiophene breaks down slowly in soil and water
Bioaccumulation: Moderate tendency to accumulate in aquatic organisms
Environmental Concerns: Portion of concern in crude oil spills lies in its resistance to rapid biodegradation, potential to harm aquatic life if concentrations build
Waste Disposal: Best to dispose of material as chemical waste following local, regional, and national regulations
Contaminated Packaging: Rinse containers, send for authorized disposal
Avoid: Flushing substantial quantities into drains or natural waterways, dilute solutions require assessment before disposal
Transport Considerations: In solid form, dibenzothiophene does not pose major transport hazards, but keep shipments away from strong oxidizers and foodstuffs
Regulatory Status: Not classified as hazardous for most modes of transport, though care required for bulk lots due to dust risk
OSHA/EU Guidelines: No separate exposure limits set for dibenzothiophene alone; observe limits for dust
Environmental Laws: Restrictions connected with environmental contamination, especially in contexts of oil spill cleanup and refining
Reporting Obligations: Storage and discharge may require notification under community right-to-know rules or similar frameworks
