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Chemical Name: Iodomethane
Other Names: Methyl iodide
CAS Number: 74-88-4
Appearance: Clear, colorless liquid
Odor: Sharp, sweet, ether-like smell
Health Hazards: Iodomethane irritates the eyes and skin and causes nausea, dizziness, and headaches. Exposure in high concentrations can impact the respiratory and central nervous systems. Iodomethane is a suspected carcinogen and poses risks with repeated use in workplaces.
Environmental Hazards: Highly toxic to aquatic life, this chemical can travel quickly through soil and water, leading to contamination problems for wildlife and groundwater.
Physical Hazards: It is volatile, forms explosive mixtures with air, and gives off toxic fumes if heated or burned.
Ingredients: Iodomethane makes up almost all of the product as a pure, single compound.
Formula: CH3I
Inhalation: Move anyone exposed to fresh air right away; get medical help for breathing difficulties.
Skin Contact: Remove contaminated clothing and rinse skin thoroughly with soap and water.
Eye Contact: Rinse eyes carefully with water for several minutes and get prompt medical attention.
Ingestion: Do not make a person vomit; seek medical help swiftly. Supportive care matters most here, as specific antidotes do not exist.
Extinguishing Media: Use foam, carbon dioxide, or dry chemical. Water spray cools exposed containers but does little to stop the fire itself.
Hazards from Combustion: Burning iodomethane produces hydrogen iodide, carbon monoxide, and other irritating gases.
Protective Equipment: Firefighters need self-contained breathing apparatus and full protective gear in any blaze involving this material.
Personal Precautions: Remove people from the contaminated area, and provide fresh air. Wear protective gear, especially gloves and eye protection.
Environmental Precautions: Block the spread of the spill to drains, soil, or water; scooping up as much as possible stops further leaks.
Cleanup Methods: Absorb with sand or inert material for proper disposal. Ventilate area thoroughly.
Safe Handling: Limit contact whenever possible; keep containers closed when not in use. Use in a well-ventilated space, preferably under a fume hood.
Storage Conditions: Store iodomethane tightly sealed in a cool, dry, well-ventilated place, away from direct sunlight, heat, and oxidizers.
Engineering Controls: Work with local exhaust ventilation or fume hoods for added safety.
Personal Protective Equipment: Use chemical-resistant gloves, splash goggles, and protective clothing. Respirators may be needed in some laboratory or industrial settings.
Exposure Limits: National and international limits have been set for occupational exposure. Following these rules helps control health risks.
Boiling Point: 42°C
Melting Point: -66°C
Density: 2.28 g/cm³
Solubility: Low in water, mixes well with organic solvents
Vapor Pressure: High at room temperature, which encourages evaporation and airborne exposure
Chemical Stability: Stable under recommended storage conditions, yet breaks down in light and moist air.
Reactivity: Reacts strongly with reduced metals, bases, and oxidizers.
Hazardous Decomposition: Can create hazardous methyl radicals and hydrogen iodide if broken down by heat or reaction with incompatible substances.
Acute Effects: Short-term exposure brings irritation, nausea, central nervous system depression, and, in worse cases, loss of coordination or breathing trouble.
Chronic Effects: Longer-term exposure can cause memory loss, tremors, and liver or kidney issues. Laboratory tests show strong evidence for animal carcinogenicity, raising concerns for people working with it often.
Routes of Exposure: Includes inhalation, skin absorption, and eye contact, all of which carry clear health risks.
Toxicity to Aquatic Life: Kills fish and water-dwelling invertebrates quickly.
Persistence and Degradability: Breaks down in soil or water but not always fast enough to prevent harm.
Bioaccumulation: Limited evidence suggests iodomethane does not build up much in organisms, but acute events may cause lasting harm.
Waste Treatment: Incineration with approved equipment handles most disposal needs. Do not pour into sewers, storm drains, or open land.
Container Management: Triple-rinse empty containers and label before sending them for proper hazardous waste disposal.
UN Number: Regulated for international transport due to toxicity and flammability.
Classification: Hazardous for land, sea, and air shipment; requires proper labels on all containers.
Packing: All shipments need strong, leak-proof containers; emergency response information must travel with the product.
Occupational Limits: National safety agencies set workplace limits on daily exposure to prevent poisoning.
Usage Restrictions: Several countries have reduced or banned iodomethane as a crop fumigant due to health and environmental risks.
Reporting Requirements: Large-scale use needs documentation and notification for environmental and workplace safety authorities.
