© 2026 Sinochem Nanjing Corporation,
All Right Reserved
Chemical Name: Sodium 4-Aminophenylarsonate
Common Synonyms: Para-aminophenylarsonic acid, sodium salt
Use: Reagent in laboratory applications, sometimes involved in organic synthesis and analytical chemistry
Molecular Formula: C6H7NNaO3As
Appearance: Fine powder, usually white to off-white in color
Odor: Typically odorless
Main Risks: Exposure can cause acute poisoning through inhalation, ingestion, and skin or eye contact. Toxic symptoms stem from both arsenic and aniline-like effects, with risk of hemolysis, methemoglobinemia, and nerve damage.
GHS Classification: Toxic if swallowed, causes skin and eye irritation, risk of long-term environmental toxicity due to arsenic content.
Signal Word: Danger
Pictograms: Skull and crossbones, exclamation mark, health hazard, environment
Component: Sodium 4-Aminophenylarsonate
CAS Number: 13002-38-7
Concentration: Greater than 95%, minor impurities possible
Key Elements: Arsenic, sodium, aminophenyl group
Inhalation: Move affected person to fresh air, keep them at rest, seek professional medical help without delay. Arsenic inhalation brings serious risk to respiratory tract, potential systemic poisoning.
Skin Contact: Wash skin thoroughly with soap and clean water, take off contaminated clothing, get medical evaluation for persistent irritation.
Eye Contact: Rinse eyes cautiously with clean water for at least 15 minutes, lift eyelids to ensure thorough washing, medical attention required due to risk of tissue damage.
Ingestion: Do not induce vomiting, rinse mouth gently, immediate medical intervention is critical because arsenic compounds carry potentially fatal toxicity.
Suitable Extinguishing Media: Dry chemical, foam, carbon dioxide; water spray only for cooling containers.
Specific Hazards: Thermal degradation may release arsenic oxides and nitrogen oxides, both extremely hazardous.
Protective Equipment: Full protective gear, positive pressure self-contained breathing apparatus for firefighting staff; avoid inhalation of fumes.
Additional Advice: Prevent contaminated run-off from entering waterways or sewer systems, as arsenic residues persist long-term.
Personal Precautions: Use gloves, goggles, particulate respirator, wear lab coat or dedicated clothing; avoid contact with skin, eyes, and clothing.
Containment: Carefully sweep up or use a vacuum with HEPA filter, avoid creating dust, place material in sealed container for disposal.
Environmental Precautions: Avoid release to the environment, especially watercourses, soil, and drains; arsenic contamination impacts ecosystems for decades or longer.
Cleanup Procedure: Wet methods for fine powders minimize airborne dust, clean area thoroughly after removal, and discard all cleaning materials as hazardous waste.
Handling: Work in well-ventilated fume hood or laboratory with exhaust systems, avoid eating or smoking in areas with substance exposure. Practice rigorous hygiene, with immediate decontamination after possible contact.
Storage: Store tightly sealed in chemical-resistant container, in a cool, dry, well-ventilated secure area, separated from food, acids, and combustibles. Access should be tightly controlled, with clear hazard signage.
Exposure Limits: OSHA and ACGIH set stringent exposure limits for arsenic compounds, often measured in microgram levels, highlighting the need for diligent control.
Engineering Controls: Use fume hoods, local exhaust ventilation, negative pressure rooms for high-volume work, regular air monitoring for arsenic particulate presence.
Personal Protective Equipment: Chemical-resistant gloves, impervious apron or lab coat, certified respirator for airborne dust, eye protection like safety goggles.
Form: Fine crystalline powder
Color: White or off-white
Solubility: Easily dissolves in water, slight solubility in ethanol
Odor: None discernible
pH (solution): Slightly acidic to neutral
Melting Point: Decomposes at elevated temperatures rather than melting cleanly
Flammability: Non-flammable, but hazardous gases form if exposed to heat
Chemical Stability: Stable under recommended handling and storage conditions, but decomposes at elevated temperatures or upon contact with acids.
Incompatible Materials: Acids, strong oxidizers, reductants, certain metals—mixing produces noxious fumes or increases risk of violent reactions.
Hazardous Decomposition Products: Arsenic oxides, nitrogen oxides, sodium fumes, which are highly toxic and irritant.
Acute Toxicity: Serious risk to health upon exposure—even at small doses, arsenic salts cause vomiting, diarrhea, shock, organ failure.
Chronic Exposure: Prolonged low-level exposure brings risks of skin changes, nerve damage, cancer. Arsenic bioaccumulates and is notorious for slow onset health impacts.
Routes of Entry: Skin contact, inhalation, ingestion, eye contact
Symptoms of Poisoning: Headache, confusion, abdominal cramps, convulsions, peripheral neuropathy, fatal collapse in severe cases
Ecotoxicity: Arsenic compounds kill aquatic life at very low concentrations, harm soil organisms, persist for years, disrupting food chains.
Persistence and Degradability: Not readily biodegradable, soil and water contamination remains extensive and hard to reverse.
Bioaccumulation Potential: Substantial; arsenic accumulates in plants, aquatic life, and persists through trophic levels.
Disposal Methods: Treat as acute toxic waste, requires high-standard incineration or secure hazardous landfill. Incinerators must filter emissions due to arsenic by-products.
Waste Storage: Clearly mark waste containers, use double-bagged or sealed chemical-resistant drums, transportation only by licensed hazardous waste handlers.
Precaution: No pouring down drains, no mixing with general waste, and never allow material into biological water treatment systems.
UN Number: Assigned under toxic inorganic arsenic compounds
Hazard Class: Toxic (Class 6.1), sometimes marked as environmentally hazardous
Packing Group: Group II or I, signifying high toxicity
Transport Labeling: Clear indication of acute toxicity, environmental risk, and forbidden carriage with foodstuffs or in passenger compartments
Compliance Requirements: Subject to strict local, national, and international controls for storage, handling, and reporting—especially due to arsenic’s status as a hazardous environmental pollutant.
Worker Protection: Significant workplace health surveillance governs any routine or research use, including medical monitoring of exposed personnel.
Environmental Reporting: Releases, spills, or unauthorized disposal of arsenic compounds require immediate notification under various chemical safety and pollution prevention laws worldwide.
