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Name: Tribromomethane, often recognized in labs as bromoform, stands out as a heavy colorless to pale yellow liquid, with a sweetish odor many would recognize from a chem lab shelf. Chemical Formula: CHBr3. CAS Number: 75-25-2. Synonyms: Bromoform. Common Uses: This compound finds its way into industrial and research settings—historically as a solvent or reagent, and in some analytical work to separate minerals. For a regular person, the only real encounter would likely be in a chemistry set or, less commonly, in some older laboratories.
Hazard Class: Acute toxicity and suspected carcinogenicity make tribromomethane something to handle with a great deal of respect. Risk Statements: It can irritate eyes, skin, and the respiratory tract. Prolonged or single high exposures present risks like drowsiness, headache, nausea, or liver and kidney damage. Its vapor, heavier than air, can gather in low places, posing inhalation risks. Pictograms and Warnings: GHS skull and crossbones for acute toxicity, exclamation mark for general hazard, and health hazard symbol for chronic effects.
Main Component: Pure tribromomethane comprises over 99% of the substance in typical lab-grade bottles. There are rarely impurities in packaged, labeled reagent-grade material. If in a mixed-use environment, consult bottle labels for potential stabilizers, though standard handling involves the neat substance.
Inhalation: Move anyone who’s breathed in bromoform to fresh air right away, keep them at rest, and call for medical help right away if symptoms show. Skin Contact: Wash skin with plenty of soap and water, removing any contaminated clothing right away. Eye Contact: Flush with water for at least 15 minutes, lifting eyelids to make sure nothing remains. Ingestion: Don’t induce vomiting; get medical attention as quickly as possible.
Suitable Extinguishing Media: Dry chemical powder, carbon dioxide, foam, or spray extinguishers all work. Water spray can knock down vapors. Fire Hazards: Tribromomethane doesn’t burn readily, but if fire gets going, it breaks down to toxic gases like hydrogen bromide and carbon monoxide. Protective Equipment: Firefighters should wear self-contained breathing apparatus and full protective gear because of the toxic nature of smoke and gases released in a fire.
Personal Precautions: Anyone tasked with clean-up should wear gloves, eye protection, and approved respirators if working in poorly ventilated spots. Environmental Precautions: Never let tribromomethane enter drains or waterways; collect spilled liquid with inert absorbents like sand or vermiculite. Cleanup Methods: Scoop up material, place it in properly labeled containers, and ventilate spill site thoroughly.
Handling: Do all work in ventilated areas—under a fume hood is best—to avoid inhaling vapors. Wear chemical-resistant gloves and safety goggles every time. Keep containers tightly closed when not in use. Storage: Store in a cool, dry place out of sunlight and away from heat sources. Use glass or compatible materials, not metals that might react. Lock up chemicals and keep away from curious hands.
Occupational Limits: Workers in settings where tribromomethane is handled must follow limits set by authorities like OSHA or NIOSH—though in real-world experience, levels must be kept very low, often set below 1 ppm. Engineering Controls: Fume hoods or local exhaust help keep vapors away from noses and lungs. Personal Protective Equipment: Chemical-resistant gloves, splash-proof goggles, and lab coat or protective clothing are basic requirements; in higher concentrations, full-face respirators make a difference.
Appearance: Colorless to pale yellow liquid; gives off a recognizable sweetish odor. Boiling Point: About 150°C (302°F). Melting Point: 8°C (46°F), so it can solidify in a chilly storeroom. Vapor Pressure: Low at room temperature, but vapors can hang at ground level. Solubility: Insoluble in water, readily dissolves in alcohol, ether, and other non-polar solvents. Density: Approximately 2.89 g/cm³, heavier than most common solvents.
Chemical Stability: Most bottles last for years if kept cool and shielded from light. Incompatibilities: Strong bases, alkali metals, or strong oxidizers will react violently; do not store near these. Hazardous Decomposition: Overheating or burning releases hydrogen bromide, a corrosive gas, and other toxic fumes including phosgene and carbon monoxide.
Routes of Exposure: Skin, eyes, lungs, and mouth are all risk areas. Short-term Effects: Drowsiness, dizziness, confusion, and irritation on contact. Chronic Effects: Some studies link bromoform to effects on kidneys and liver over time; animal tests suggest possible nerve and reproductive system effects. Carcinogenic Status: Classified by IARC as possibly carcinogenic to humans (Group 2B). Evidence in humans remains inconclusive, but caution rules the day.
Environmental Fate: Tribromomethane doesn’t break down quickly in water or soil, sticking around longer than many other solvents. Ecotoxicity: Fish and aquatic insects are especially sensitive; a spill in a water body can wipe out local populations of small organisms. Biodegradability: Slow rates make soil and water contamination a persistent problem. Bioaccumulation: Little evidence this compound builds up dramatically in animal tissues, but aquatic life damage is still real.
Waste Handling: Old or spilled tribromomethane should go into secure, properly labeled containers for incineration at licensed chemical waste plants. Sewer or Trash Disposal: Never discharge down the drain or into everyday trash—special procedures keep water sources safe. Cleaning Equipment: Tools and surfaces needing decontamination must be washed with neutralizing agents and checked for residue before regular use.
UN Number: UN 2515. Hazard Class for Transport: Most regulatory systems list tribromomethane as a dangerous good—flammability isn’t the main concern, but toxicity requires strong packaging. Proper Shipping Name: Tribromomethane. Transport Regulation: If moving it across borders or by air, strict paperwork and labeling rules apply.
Global Regulatory Status: Tribromomethane appears on many chemical control lists, and several jurisdictions ban or sharply restrict its use outside of research or specialty manufacturing. SARA Title III, CERCLA: U.S. regulations demand reporting of certain spill volumes. Worker Protection: Many countries recognize strict limits on workplace air levels, along with required employee training and health monitoring. Community Right-to-Know: Laws in some regions demand public disclosure if used or stored in bulk.
