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Chemical Name: 4-Aminobiphenyl
Common Synonyms: p-Aminobiphenyl, 4-Phenylaniline
Chemical Formula: C12H11N
CAS Number: 92-67-1
Description: Solid with pale yellow to brown coloring, often encountered in research laboratories or chemical industry processes, recognizable by a faint amine-like odor, sometimes sharp.
Classification: Human carcinogen, classified by IARC as Group 1. Proven risk for bladder cancer in humans. Acute health effects include skin, eye, and respiratory tract irritation. Chronic exposure links directly to cancer risk, which ranks among the most serious chemical occupational hazards.
Signal Word: Danger
Hazard Symbols: Skull and crossbones, exclamation mark, health hazard.
Principal Hazards: Cancer development, genetic damage, skin absorption risk, mutagenic properties.
Main Component: 4-Aminobiphenyl, typically close to 100% where it is handled intentionally. Sometimes encountered as an impurity in dye or chemical reactions.
Impurities: Byproducts tied to manufacturing, sometimes include persistent or toxic traces from synthesis but rarely specified in public literature.
Inhalation: Move to fresh air, avoid direct rescue without proper gear. Medical monitoring advised even after brief exposure due its latent health risks.
Skin Contact: Remove contaminated clothing, wash affected area thoroughly with soap and plenty of water. Watch for delayed effects.
Eye Contact: Rinse with water for several minutes. Visual symptoms sometimes misleading; medical attention strongly recommended.
Ingestion: Seek urgent medical care. Avoid inducing vomiting.
Flammability: Not especially flammable under normal conditions but will decompose under heat, releasing toxic aromatics and nitrogen oxides.
Suitable Extinguishers: Dry chemical, CO2, foam. Water spray to cool containers, avoid direct water jets.
Hazardous Combustion Products: Carbon monoxide, carbon dioxide, nitrogen oxides, potentially toxic aminobiphenyl vapors.
Firefighter Protection: Full protective gear plus self-contained breathing apparatus is not negotiable, since smoke and vapor present a cancer risk.
Personal Precautions: Respiratory protection and impervious gloves, with access restriction for unprotected personnel.
Environmental Precautions: Keep out of sewer or waterways, this compound brings environmental persistence and toxicity, leading to serious groundwater contamination risks.
Cleanup Methods: Collect powder by vacuum with HEPA filter, wet wiping for residues. Dispose of as hazardous waste, minimizing dust. Drench area with wet absorbent material during cleaning to prevent airborne spread.
Handling: Minimize dust, handle under ventilation such as a fume hood or glove box, and use dedicated equipment, since even trace amounts spread cancer risk. Any skin contact or inhalation must be taken seriously.
Storage: Store in tightly closed containers, in a cool, dry, well-ventilated area, away from oxidizers and light. Ideally, locked storage reserved for carcinogenic or highly hazardous substances.
Exposure Limits: The strictest standards apply. OSHA Permissible Exposure Limit: 0.1 mg/m³ (skin notation). NIOSH recommends keeping exposure at “lowest feasible concentration.”
Engineering Controls: Chemical fume hood required, with negative pressure. Local exhaust at emission points prevents airborne spread.
Personal Protection: Chemical-resistant gloves, full eye protection, long sleeves, and at minimum, a properly fitted respirator with cartridge for organic vapors and particulates. Protective clothing should be disposable or laundered separately, never worn outside controlled areas.
Hygiene Measures: No eating, drinking, or smoking in work area. Always wash hands and face before breaks or leaving the workplace.
Appearance: Pale yellow to brown crystalline powder, sometimes tan granules.
Odor: Faint, amine-like.
Molecular Weight: About 169.2 g/mol.
Melting Point: Around 50–53°C.
Boiling Point: Significantly above ambient, usually cited near 340°C.
Solubility: Slightly soluble in water; better solubility in organic solvents like ethanol, ether.
Vapor Pressure: Very low at room temperature.
Other Properties: Stable under ordinary conditions, but decomposes on heating, releasing toxic vapors.
Chemical Stability: Stable in sealed containers under normal conditions, but sensitive to light and air over long periods.
Reactivity: May react with strong oxidizers. Releases dangerous nitrogen oxides and carbon monoxide at elevated temperatures.
Decomposition Products: Aromatic amines, nitrogen oxides, which pose serious toxicological hazards.
Acute Effects: Eye, skin, and respiratory irritation, with absorption through skin as a notable danger.
Chronic Effects: Potent bladder carcinogen, long latency period between exposure and symptom onset. Mutagenic effects documented in experimental animals.
Routes of Entry: Inhalation, ingestion, skin absorption.
Symptoms: Long-term exposure may be asymptomatic at first; cancer risk dominates. No “safe” level has been established for chronic risk.
Target Organs: Bladder, liver, and kidneys bear the brunt of toxic damage.
Anecdotal Evidence: Occupational exposures in dye, rubber, or chemical plants led to some of the earliest industrial cancer clusters.
Environmental Impact: Persistence in soil and water, high risk to aquatic life due to toxicity. Bioaccumulates, threatening food chains and drinking water sources.
Mobility: Low to moderate; binds to sediments, but leaches under some conditions.
Degradability: Resistant to natural breakdown, survives in untreated wastewater.
Waste Treatment: Incinerate in approved facility with exhaust gas scrubbing. Landfilling only under hazardous waste codes and with proper containment.
Precautions: Never pour into drains or regular trash. Label and segregate with other carcinogenic substances to reduce risk. Sharply restrict access to authorized personnel.
Legal Obligations: Waste must comply with hazardous waste regulations to keep public and environment safe from contamination.
Classification: Regulated as hazardous material under international and local regulations.
Shipping: Only in secure, labeled, sealed containers, handled by certified personnel.
Precautions: Carcinogen labeling required. Any spill during transit calls for immediate reporting and containment measures.
Modes: May ship by road, air, or sea with strict chain-of-custody documentation.
OSHA Status: Listed hazardous substance, subject to strict workplace controls.
EPA Regulation: Toxic Substances Control Act applies.
IARC Status: Group 1 carcinogen, meaning there is enough evidence to state it causes cancer in humans.
Other: Subject to reporting under SARA Title III and similar public health laws. Registered in chemical inventories of many countries as “substance of high concern.”
