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Product Name: Ethyldichloroarsine
Synonyms: Dick, EtDCA, Clark I, Chloroethylarsine
Chemical Formula: C2H5AsCl2
CAS Number: 598-14-1
Intended Use: Laboratory research, chemical warfare studies, not suitable for commercial or pharmaceutical applications
Manufacturer: Provided upon request
Emergency Contact: Refer to institution’s chemical safety officer
Classification (GHS): Acute Toxicity (Oral, Dermal, Inhalation), Skin Corrosion/Irritation, Serious Eye Damage
Signal Word: Danger
Hazard Statements: Lethal by inhalation, skin contact, and ingestion. Rapidly causes eye, skin, and respiratory burns. Acute exposure can result in pulmonary edema, systemic organ damage, permanent blindness, and death.
Pictograms: Skull and crossbones, corrosive, exclamation mark, environment
Precautionary Statements: Prevent release into environment. Use only within enclosed, ventilated settings with maximum PPE. All handling should be by trained professionals only.
Main Routes of Exposure: Inhalation, skin absorption, ingestion, eye contact
Potential Chronic Effects: Carcinogenic potential undefined, recognized for cumulative toxicity, neurotoxic effects, persistent pulmonary injury possible after exposure.
Chemical Name: Ethyldichloroarsine
Percentage (%): ≥98%
CAS Number: 598-14-1
Impurities contributing to hazard: Possible trace hydrolysis byproducts such as hydrochloric acid, arsenic trichloride, and small amounts of ethyl chloride.
General Information: Immediate action required after any exposure. Remove victim from exposure. Do not attempt rescue without full chemical protective equipment.
Inhalation: Move to fresh air as fast as possible. Seek immediate medical attention. Oxygen therapy may be needed. Pulmonary edema can onset 12–36 hours post-exposure.
Skin Contact: Remove contaminated clothing. Wash skin with copious amounts of running water. Do not use neutralizers. Immediate medical evaluation is essential.
Eye Contact: Rinse eyes under running water for 20+ minutes while holding eyelids open. Do not allow victim to rub eyes. Get emergency care.
Ingestion: Do not induce vomiting. Rinse mouth with water if person is conscious. Seek urgent hospital treatment.
Delayed Symptoms: Severe respiratory distress, dermal necrosis, systemic toxicity; monitor for secondary symptoms.
Suitable Extinguishing Media: Dry chemical powder, carbon dioxide, foam. Water spray only for cooling containers.
Unsuitable Media: Direct streams of water can spread contamination.
Hazardous Combustion Products: Toxic arsenic and chlorine compounds, phosgene may form when heated.
Special Protective Equipment: Self-contained breathing apparatus (SCBA). Full chemical-resistant suit.
Firefighting Instructions: Approach from upwind. Evacuate personnel beyond 500 meters radius if large fire. Cool containers that are exposed to heat, avoid contamination runoff.
Personal Precautions: Evacuate area. Only trained response teams in SCBA and gas-tight suits should respond.
Environmental Precautions: Prevent chemical from entering drains, surface waters, or soil.
Methods for Cleanup: Absorb liquid with inert material (vermiculite, dry sand). Shovel into labeled drums for licensed disposal. Neutralize spill area with dilute sodium sulfide or calcium hypochlorite under expert supervision.
Decontamination Considerations: Wash spill area with soap and copious water, ventilate zone, monitor for residual vapor.
Handling Precautions: Use in closed chemical hoods only. Avoid all forms of physical contact. Provide emergency shower and eyewash in vicinity.
Safe Storage Conditions: Store in tightly sealed glass or compatible containers. Dedicated, well-ventilated, dry, cool, and secure storage locations only. Segregate from acids, oxidizers, water, foodstuffs, and incompatible chemicals.
Container Materials: Use glass, Teflon, or compatible lined metallic drums.
Special Restrictions: Keep away from heat, sparks, flames, and any sources of moisture.
Occupational Exposure Limit: NIOSH REL: 0.001 mg/m³ (as As), IDLH: 5 mg/m³ (as As)
Engineering Controls: Chemical fume hood with dedicated exhaust, negative pressure workspace, continuous arsenic vapor monitoring.
Personal Protection: Full-face respirator (PAPR or SCBA), chemical-resistant gloves (laminated film or Viton), butyl rubber suit, chemical-resistant boots, face shield, and splash goggles.
Hygienic Practices: Wash hands before breaks and after handling, remove contaminated PPE before eating or drinking.
Appearance: Colorless to brownish oily liquid
Odor: Strong, pungent, garlic-like odor
Boiling Point: 156°C
Melting Point: -33°C
Vapor Pressure: 7 mmHg at 20°C
Solubility in Water: Reacts with water
Density: 1.6 g/cm³ (20°C)
pH: Not applicable – reacts and decomposes in water
Partition Coefficient (n-octanol/water): Not determined
Flash Point: Not flammable under normal conditions
Evaporation Rate: Fast at ambient temperatures
Autoignition Temperature: Not determined
Chemical Stability: Unstable in presence of water or moist air, readily hydrolyzes producing toxic and corrosive gases.
Incompatible Materials: Water, acids, oxidizers, alkalies, certain metals.
Decomposition Products: Hydrochloric acid, arsenic oxides, ethyl chloride.
Hazardous Polymerization: Not reported
Conditions to Avoid: Moisture, heat, open flames, direct sunlight, sources of ignition.
Acute Toxicity: Highly toxic by all exposure routes. Estimated lethal dose (humans): Inhalation 20–200 mg/m³/min, Dermal 3–20 mg/kg, Oral 6–10 mg/kg.
Symptoms: Eye and skin burns, severe irritation, tearing, pulmonary edema, headache, vomiting, systemic organ failure.
Chronic Toxicity: Potential for severe cumulative arsenic poisoning, central nervous system effects, increased risk of cancer with repeated exposure.
Routes of Exposure: Inhalation, dermal, ocular, oral.
Carcinogenicity: Not classified by IARC/OSHA but arsenic compounds recognized as human carcinogens.
Mutagenicity/Reproductive Toxicity: Not fully studied, high risk due to arsenic component.
Environmental Fate: Persistent, very toxic to aquatic and terrestrial organisms. Hydrolysis products increase long-term contamination risk.
Bioaccumulation Potential: Arsenic compounds accumulate in food chains and sediments.
Mobility in Soil: Spills contaminate soil and groundwater permanently.
Aquatic Toxicity: LC50 (fish): <1 mg/L. High mortality in aquatic species at micromolar concentrations.
Other Adverse Effects: Arsenic accumulation results in long-term ecosystem toxicity.
Product Disposal: Treat as highly toxic waste. Incinerate in authorized hazardous chemical facility with scrubbers for arsenic gas. Do not landfill or dispose of via drains.
Container Disposal: Triple rinse with neutralizing solution by trained personnel. Dispose of containers as hazardous waste.
Local Regulations: Disposal only via licensed chemical waste handlers under government oversight.
Decontamination: Waste clean-up tools and PPE should be treated as highly toxic and incinerated or disposed of by specialist.
UN Number: UN 1558
Proper Shipping Name: ETHYLDICHLOROARSINE, liquid, toxic
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: I (great danger)
Labels Required: Toxic, Corrosive, Marine Pollutant
Special Precautions: Notify authorities before transport. Ensure compatible, leak-proof containment. Emergency response guides must accompany all shipments.
Transport Restrictions: Not allowed on passenger aircraft or by post.
U.S. TSCA: Listed (controlled substance, subject to reporting and use limitations)
OSHA: Regulated as highly toxic substance; all work practices must follow CFR 1910.119
EPA: Classified as acutely hazardous (P-list waste, strict environmental regulations)
EU: REACH: Registration required for handling, classified under CMR category for arsenic compounds; Schedule 1 Chemical Weapons Convention—prohibited for general use
Other Regulations: Many jurisdictions consider possession and use illegal without government approval; strict transport, disposal, and handling permissions.
