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Chemical Name: 1,4,5,6,7,8,8-Heptachloro-3A,4,7,7A-Tetrahydro-4,7-Methanoindene
Common Name: Heptachlor (often recognized in soil and pesticide settings)
Appearance: White to light tan crystalline solid with a slight camphor-like odor
Major Uses: Historically used as an insecticide, still detected in older agricultural sites and contaminated environments
Key Identifiers: CAS number 76-44-8
Main Risks: Hazardous if inhaled, swallowed, or comes into contact with skin; causes harm to organs through prolonged or repeated exposure; categorized as possible human carcinogen (IARC Group 2B)
Routes of Exposure: Inhalation, skin contact, ingestion
Symptoms: Headaches, dizziness, convulsions, nausea, possible liver damage after repeated exposure
Environmental Impact: Classified as a persistent organic pollutant, tends to bioaccumulate in wildlife and human fatty tissues, harmful to aquatic life
Signal Word: Danger
Chemical Purity: Heptachlor often above 95%; impurities might include heptachlor epoxide and non-chlorinated hydrocarbons
Other Components: No significant additives in raw product; technical grade may feature minor related chlorinated compounds
Inhalation: Move to fresh air and keep the person at rest; medical help needed when symptoms like difficulty breathing, confusion, or headaches occur
Skin Contact: Remove contaminated clothing and wash skin with soap and water; pay attention to symptoms like redness or irritation
Eye Contact: Rinse gently with lukewarm water for several minutes; medical advice recommended for persistent pain or vision problems
Ingestion: Do not induce vomiting; rinse mouth and seek immediate medical attention; never give fluids to unconscious individuals
Sensitivity: Not easily combustible, but releases toxic fumes (chlorine, phosgene, carbon monoxide) when burned
Extinguishing Media: Use foam, dry chemical powder, carbon dioxide for small fires; avoid water streams that spread contamination
Firefighter Protection: Self-contained breathing apparatus and full protective clothing strongly advised due to potential for toxic smoke
Special Hazards: Burning releases dense, hazardous smoke and possibly corrosive gases; runoff may contaminate waterways or soil
Personal Safety: Avoid direct contact with spilled material; use chemical-resistant gloves, goggles, and protective suits
Environmental Precautions: Prevent release into drains, open water, or soil; contain spill with barriers if feasible
Cleanup Methods: Scoop up solid material and place in marked, sealed containers for disposal; ventilate area and clean residue with absorbent materials
Spill Reporting: Any significant release should be communicated to local authorities due to environmental risks
Handling: Always use chemical goggles and gloves; never eat, drink, or smoke near this chemical; guard against accidental releases by working with trays or containment
Storage: Store in tightly closed containers in a cool, dry, well-ventilated area; keep away from heat, sparks, open flames, or incompatible chemicals; segregate chemicals to reduce risk of cross-contamination
Exposure Limits: Current occupational limits often suggest time-weighted averages around 0.5 mg/m³
Controls: Use local exhaust ventilation; limit dust generation and inhalation with engineering controls
PPE Recommendations: NIOSH-approved respirators, heavy-duty chemical gloves, goggles, and protective clothing required if exposure threat exists
Hygiene: Wash thoroughly before breaks and after handling; separate work clothing from street clothes to prevent take-home exposure
Form: Crystalline solid
Color: White to tan
Odor: Slight camphor or musty odor
Melting Point: About 95°C
Solubility: Practically insoluble in water; soluble in common organic solvents
Vapor Pressure: Low at room temperature
Density: 1.65 g/cm³
Chemical Stability: Stable under recommended storage conditions for years
Reactivity: Reacts with strong oxidizers, alkaline materials, strong acids; may break down at high temperatures or in ultraviolet light
Hazardous Decomposition Products: Chlorinated hydrocarbons, phosgene, and other toxic vapors during combustion or decomposition
Incompatibility: Strong heat, UV radiation, oxidizing agents accelerate breakdown to toxic secondary products
Acute Effects: May cause irritation to skin and eyes on contact; breathing large amounts can lead to dizziness, tremors, and in some cases, convulsions
Chronic Effects: Build-up in body fat may cause liver damage, immune suppression, and possible carcinogenicity; studies link long-term exposure with higher cancer incidence in lab animals
Sensitization: No clear evidence of allergy risk, but repeated contact could lead to skin changes
Absorption Routes: Most significant risks come from ingestion or skin absorption, especially in contaminated work environments or during improper cleanup
Persistence: Lingers in soil and sediments for decades; does not break down quickly under most conditions
Bioaccumulation: High potential to build up in fish, birds, and mammals; enters the food chain and magnifies in predators, including humans
Aquatic Impact: Exceedingly toxic to aquatic invertebrates and can lead to die-offs in contaminated streams and ponds
Soil Mobility: Once in soil, typically binds tightly, but improper disposal can leach into groundwater over time
Waste Treatment: Destruction only in permitted incinerators outfitted with scrubbers for chlorinated compounds; landfill should only serve for destroyed, non-reactive ash
Container Disposal: Rinsed and triple-washed containers may be regulated as hazardous waste; avoid burning containers in open air
Reuse and Recycling: Not safe nor practical for reuse due to contamination risk
Status: Regulated as hazardous material; generally ships as hazardous waste due to recognized risks
Placarding: Appropriate Department of Transportation hazard signage required by authorities for shipments
Packaging: Only tough, tightly sealed containers permitted; transport restricted under international treaties due to this product’s environmental persistence
International Controls: Included under the Stockholm Convention for persistent organic pollutants, restricting much of its use and trade across borders
National Regulation: Banned or heavily restricted in numerous countries; U.S. Environmental Protection Agency classifies it as hazardous waste; subject to monitoring by regulatory bodies
Worker Protection Standards: Workplaces with old stocks or contamination sites must provide strict protection, regular medical testing, and limits on exposure time
