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Substance Name: Arsenic Tribromide
Chemical Formula: AsBr3
Common Uses: Laboratories work with arsenic tribromide for chemical syntheses, research, and processes involving halogenation. This isn’t a compound you spot in everyday life. It earns a place in academic, analytical, and niche industrial settings.
Appearance: The crystals usually stand out with a white or pale yellow look. Its sharp odor can signal its presence before a spill gets visually noticed.
Molecular Weight: 314.63 g/mol
GHS Classification: Skin corrosion, Acute toxicity (oral, dermal, inhalation), Aquatic toxicity
Main Health Hazards: Arsenic tribromide carries strong toxic punch, irritating skin, eyes, and airways. Swallowing or inhaling can cause acute poisoning, shock, multi-organ damage, and possible death. Chronic exposure raises cancer risks and systemic toxicity.
Environmental Hazards: This compound fouls water quickly. Once released, arsenic compounds linger, poison aquatic life, threaten ecosystems, and build up in food webs.
Signal Words: Danger, Poison
Main Component: Arsenic tribromide (CAS Number: 7784-34-1)
Concentration: Nearly pure in research applications, minimal admixtures
Impurities: Rarely significant enough to matter outside quality control in lab settings
Inhalation: Fresh air immediately, oxygen if breathing strains, medical help at once. Symptoms often hit fast and hard: coughing, breathlessness, chest tightness, headache, and in severe cases, convulsions.
Skin Contact: Drench skin with running water. Remove contaminated clothing right away. Arsenic can seep through skin, so medical attention comes next even for minor splashes.
Eye Contact: Hold eyelids open, flush with water for at least 15 minutes. Damage to eyes tends to linger, so quick response matters.
Ingestion: Never induce vomiting. Rinse mouth, seek medical help, and try to keep the person calm and upright.
Suitable Media: Dry chemical, carbon dioxide, foam—avoid water sprays that can spread the chemical.
Hazardous Combustion Products: Expected release of arsenic oxides and bromine vapors can turn a small fire into an inhalation nightmare.
Firefighter Protection: Proper suits and self-contained breathing gear are not optional. Brief exposure to smoke or fumes poses real health risks.
Other Risks: Heat triggers toxic, corrosive fumes and increases vaporization.
Personal Precaution: Evacuate the space, restrict entry, arm responders with gloves, goggles, full-body suits, and proper breathing protection. Without preparation, exposure comes quickly and carries lifelong effects.
Environmental Precautions: Do everything possible to prevent runoff to drains and soil. Once in the environment, collection costs soar and long-term cleanup rarely finishes as fast as promised.
Cleanup: Use inert materials like vermiculite to soak up spills. Seal waste for disposal by qualified handlers. Ventilate the area thoroughly before allowing reentry.
Handling: Only trained professionals with reliable PPE should handle open material. Safe procedures mean working in ventilated hoods, avoiding skin contact, using tongs, and storing all waste in labeled, sealed containers right away.
Storage: Keep locked up, in climate-controlled, corrosion-resistant cabinets. No storage near moisture, acids, bases, food, or flammable chemicals. Containers must stay tightly sealed with good secondary containment.
Labeling: Clear hazard tags, access restricted to need-to-use personnel.
Engineering Controls: Fume hoods, gloveboxes, air monitoring. Facilities should air out work areas, keep negative pressure, and regularly check filter integrity.
Personal Protection Equipment (PPE): Nitrile gloves, splash-proof goggles, face shields, chemical aprons, and always a self-contained breathing apparatus if there’s dust or vapor threat.
Exposure Limits: OSHA sets arsenic limits—generally 0.01 mg/m3 for inorganic arsenic, but strict monitoring remains vital. Even the best rules only protect those following them closely.
Appearance: Crystalline, white or pale yellow
Odor: Sharp, acrid
Melting Point: Around 31.5°C
Boiling Point: About 220°C
Solubility: Reacts strongly with water; soluble in some organic solvents
Vapor Pressure: Notable at room temperature—this heightens the inhalation risk, even from small spills loaded with invisible vapor.
Density: Heavier than water, making runoff particularly dangerous.
Chemical Stability: Stable in airtight dry containers kept out of sunlight.
Hazardous Reactions: Vigorous reaction with water, alcohols, bases, and oxidizers—produces heat and toxic vapors.
Incompatibles: Moisture, alkali metals, magnesium, and anything that can cause violent decomposition.
Decomposition: Toxic arsenic oxides and bromine gas—these linger and spread fast.
Acute Exposure: Rapid absorption through skin or lungs, even at low doses, causes nausea, vomiting, abdominal pain, garlic breath, confusion, convulsions, kidney and liver damage.
Chronic Effects: Prolonged, repeated contact or inhalation raises cancer risk, skin lesions, nerve damage, and delayed organ failure.
Sensitization: Some people react more easily to arsenic compounds after initial exposure—risk escalates with every unprotected contact.
Routes of Exposure: Inhalation, skin, ingestion
Carcinogenicity: Classified as a known human carcinogen by IARC and EPA. Statistics link workplace arsenic exposures to lung, skin, and bladder cancers.
Aquatic Toxicity: Highly toxic to aquatic life; bioaccumulates with ease and transmits up food chains. Waterways suffer slow poisoning, fish die-off, and food source disruptions.
Persistence: Arsenic doesn’t just go away. Sediments hold onto it for years—sometimes decades.
Degradability: No effective natural breakdown in water or soil.
Mobility: Once spilled, migration through ground and water systems delivers long-term problems far from the original site.
Waste Treatment: Never pour down drains or put in household waste. Collect in sealed, labeled containers and pass on to licensed hazardous waste processors.
Regulatory Controls: Strict tracking under hazardous waste laws in most regions. Fines and penalties mean little compared to risks from improper disposal.
Cleanup Aftermath: Areas exposed to spills require aggressive decontamination—soil removal, water treatment, and, often, permanent site monitoring.
Shipping Name: Toxic solid, inorganic, n.o.s. (contains arsenic tribromide)
UN Number: UN 3288
Packaging: Special UN-approved drums or bottles, shock-resistant and sealed in secondary containment with clear hazard warning diamonds.
Transport Risks: Spills in transit can trigger major emergency response. Transit restrictions and routes usually require notification and pre-approval from local authorities.
Classification: Arsenic tribromide sits on many countries’ lists of highly hazardous substances with strict limits on access, use, and reporting.
OSHA / EPA: Occupational exposure heavily regulated, with requirements for training, monitoring, reporting, and immediate spill reporting.
Workplace Controls: Written handling protocols, mandatory training, and regular safety reviews protect workers and communities.
