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Common Name: 4-Aminophenylarsonic Acid
Chemical Formula: C6H8AsNO3
Appearance: White to off-white powder
Odor: Odorless
Uses: Commonly studied as a chemical intermediate, sometimes has historical uses in agriculture and research
CAS Number: 98-50-0
Health Dangers: Contains arsenic, which brings strong toxicity to humans and animals; exposure can lead to high risk of poisoning if inhaled, swallowed, or absorbed through the skin
Acute Effects: Symptoms after exposure range from irritation of the skin and eyes to headaches, nausea, vomiting, muscle weakness, and possible convulsions
Chronic Hazards: Long-term exposure links to cancer and damage to the liver, kidneys, and circulatory system; persistent arsenic substances are notorious for building up in the body
Environmental Hazards: Releases into soil or water can greatly harm ecosystems; arsenic contamination in water supplies leads to serious health risks for communities
GHS Label Elements: Skull and crossbones symbol, exclamation mark indicating acute toxicity and specific organ toxicity
Main Ingredient: 4-Aminophenylarsonic Acid
Arsenic Content: High percentage of elemental arsenic by weight, a factor making the substance more dangerous
Impurities: Minor by-products of organic synthesis can be present; commercial or lab-prepared samples may carry traces of solvents or related compounds
Inhalation: Remove person to fresh air; urgent medical attention often needed due to potential for systemic arsenic poisoning
Skin Contact: Immediate washing with soap and water; contaminated clothing should be removed right away to limit exposure
Eye Contact: Rinse thoroughly with plenty of water, lifting eyelids occasionally; long washes are critical for chemical burns
Ingestion: Medical professionals say do not induce vomiting; rinse mouth and seek emergency care
Symptoms Requiring Hospital Evaluation: Respiratory distress, extreme gastrointestinal upset, confusion, or collapse; a medical provider must evaluate these
Flammability: Not inherently flammable, but burns can release toxic smoke including arsenic oxides
Suitable Extinguishing Media: Water spray, foam, dry chemicals, carbon dioxide; personal protective equipment for fire-fighters strongly recommended
Smoke and Byproducts: Hot fires break compound down into dangerous gases; inhalation of fire-cloud is far riskier than many common substances
Precautions: Emergency personnel must use self-contained breathing equipment to prevent arsenic poisoning; keep site ventilated
Spill Cleanup: Avoid breathing dust; only trained staff should attempt cleaning with personal protection including gloves and respirator
Containment: Prevent contact with soil, drains, and waterways to block environmental contamination
Disposal of Waste: Sweep up dust without generating clouds; use sealed, labeled containers for safe handling and disposal
Ventilation: Open windows and use exhaust fans in enclosed spaces
Safe Handling: Protective barriers like gloves, safety goggles, and face masks prevent accidental exposure; trained workers reduce risk
Storage Conditions: Keep in tightly closed containers; moisture, heat, and incompatible chemicals such as oxidizers raise risks
Segregation: Store far from food, feed, and casual staff areas; access limited to authorized personnel
Hygienic Practices: Eating, drinking, and smoking should never take place near workspaces containing this acid; thorough hand washing after handling
Engineering Controls: Use fume hoods, exhaust fans, and local ventilation systems; open lab windows as standard precaution
Personal Protection Equipment: Gloves made of nitrile or neoprene, chemical safety goggles, face shields, lab coats, and, for routine use, fitted respirators
Exposure Limits: National health agencies list very low allowed airborne arsenic levels; workplace monitoring remains key to preventing chronic exposure
Work Practices: Regular workplace monitoring and routine employee blood checks for arsenic contribute to community health and personal safety
Physical State: Solid, powder
Melting Point: Above 230°C
Solubility: Soluble in water
Stability under Normal Conditions: Stable when kept dry and cool
Color and Form: White or off-white powder
Odor: No significant smell detected by most people
Chemical Stability: Stable under standard laboratory conditions
Reactivity: Can react with strong oxidizers or acids to release more toxic arsenic compounds
Decomposition: Heating breaks the substance down, producing toxic fumes
Incompatibility: Strong oxidizing agents, mineral acids increase risk of dangerous reactions
Acute Toxicity: Swallowing even small amounts creates risk for severe poisoning; symptoms reach most organs
Chronic Exposure: Hair loss, skin damage, nervous system decline, cancers of bladder, skin, and lung well-documented from environmental arsenic
Routes of Exposure: Inhalation, skin contact, ingestion
Carcinogenicity: International research groups recognize arsenic compounds among the substances most likely to cause cancer in people
Target Organs: Liver, kidney, lungs, skin, central nervous system
Aquatic Toxicity: Poisonous to aquatic life even at very low concentrations; long-lasting environmental effects
Persistence: Arsenic sticks around in sediments and soil for decades, affecting crops and groundwater
Bioaccumulation: Builds up in fish, plants, and other wildlife; enters the food chain and increases risk to humans and other top predators
Contaminated Water Risk: Leaching from waste sites or agricultural use leads to unsafe water in nearby communities, something I’ve seen cause years of hardship in rural areas
Disposal: Treat as hazardous waste; do not dump down drains or regular trash
Incineration: Only highly controlled conditions and equipment certified to handle arsenic compounds make this safe
Secure Landfill: Store in clearly marked, leakproof containers at licensed toxic waste sites
Legal Requirements: Waste management must meet strict governmental rules to protect workers and the environment
Dangerous Goods Classification: Carries hazardous materials designations due to arsenic content
Labeling: Must carry clear poison hazard labels; international rules demand tracking and documentation
Packaging Requirements: Strong, sealed containers withstand bumping and weather; drivers and handlers get special hazard training
Regulation: Transport only by licensed firms with experience in hazardous chemicals
Substance Regulation: National governments, the EU, and world agencies tightly control arsenic compounds; many uses banned outright
Workplace Rules: Safety laws demand regular risk assessments, employee training, and monitoring
Health Surveillance: Employers often must run medical screenings for staff with any long-term arsenic contact
Public Protections: Drinking water standards set extremely low thresholds for arsenic; community exposure spurs urgent cleanup actions and, sometimes, government compensation programs
