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Chemical Name: Imazethapyr
Common Uses: Control of certain broadleaf and grassy weeds in soybeans, peanuts, dry beans, and other legume crops
Physical Appearance: Off-white to beige crystalline powder; sometimes available in formulated liquids
Odor: Mild, earthy
Chemical Class: Imidazolinone herbicide
CAS Number: 81335-77-5
Other Identifiers: May show up in commercial formulations mixed with surfactants and solvents, often proprietary
Health Risks: Inhalation and skin contact can cause mild irritation; rare cases may see eye irritation after direct exposure; not classified as probable carcinogen
Label Hazards: May have precautionary statements about respiratory and eye irritation on commercial packages
Signal Word: Most commonly labeled ‘Caution’ on U.S. EPA-registered products
Acute Toxicity: Generally low; ingestion of large amounts could lead to gastrointestinal discomfort or nausea
Chronic Effects: No evidence of mutagenicity or teratogenicity in published academic studies
Main Component: Imazethapyr (active ingredient) — usually ranging 23%-70% in most formulations
Other Components: Inert ingredients can include solvents, water, surfactants, and buffering agents
Hazardous Ingredients: Most inert ingredients in U.S.-labeled products are considered non-hazardous, but SDS for formulations may flag specific solvents as minor irritants
Eye Exposure: Rinse gently with water, lifting eyelids, for at least 15 minutes; seek medical attention if discomfort persists
Skin Contact: Wash with soap and water; remove contaminated clothing and wash before reuse
Inhalation: Move to fresh air, monitor for symptoms; seek attention if breathing is affected
Ingestion: Rinse mouth and call a doctor if feeling unwell; do not induce vomiting unless instructed
Additional Support: Some rural clinics may still lack awareness about less common herbicide exposure, so always share the chemical’s identity directly if emergency care is needed
Suitable Extinguishing Media: Water spray, dry chemical, foam, carbon dioxide
Special Hazards: Burning releases nitrogen and sulfur oxides, trace hydrocarbons; avoid smoke inhalation
Protective Equipment: Firefighters use full protective gear; self-contained breathing apparatus to avoid inhaling breakdown fumes
Precautions: Firewater runoff could carry residues to drains or surface water, creating downstream hazards for fish; local response agencies often require containment booms in agricultural areas to prevent this
Personal Protection: Wear gloves, safety glasses, and dust mask; avoid direct dermal or respiratory contact
Environmental Cautions: Prevent spills from entering soil, groundwater, or nearby surface water, since imazethapyr is persistent and mobile in some soils
Cleanup Procedures: Scoop up solid material or absorb liquid with earth or sand; sweep carefully into secure containers for disposal
Disposal: Follow pesticide waste rules—smaller spills can go in hazardous waste, larger releases may require environmental agency notification
Remediation: Dilution with water is not recommended, as this may spread contamination further and compound cleanup
Handling Advice: Use with good ventilation in mixing, only mix what you need, avoid splashing or aerosolizing; never store near food, animal feed, or seed
Storage Conditions: Keep products tightly closed in original containers, in cool, dry, well-ventilated spaces out of direct sunlight
Segregation: Store away from acids, oxidizers, and water sources; never keep with incompatible or flammable farm chemicals
Personal Hygiene: Wash hands before breaks, eating, or bathroom visits—residues can linger under fingernails and transfer to food or skin
Engineering Controls: Enclosed mixing and transfer systems on commercial farms reduce the risk of splashing or inhalation
Personal Protective Equipment (PPE): Chemical-resistant gloves (nitrile recommended), safety goggles, long sleeves and pants
Respiratory Protection: Dust/mist respirator suggested if working with granular forms or large volumes in unventilated sheds
Monitoring: No specific exposure limit set by OSHA; general nuisance dust guidelines may apply on large-acreage mixing rigs
Form: Crystalline solid or liquid concentrate, depending on formulation
Color: Off-white, sometimes beige
Odor: Mild, earthy or slightly chemical
Melting Point: 173-174°C for pure active
Solubility: Highly soluble in water—over 1 g/L at ambient temperature
pH: Most liquids are weakly acidic to neutral
Vapor Pressure: Very low, practically non-volatile at room temperature
Chemical Stability: Remains stable under normal storage conditions unless mixed with strong oxidizers or acids
Hazardous Reactions: Rare under typical farm handling, but may decompose and produce irritating vapors under fire or strong heating
Materials to Avoid: Strong acids, bases, and oxidizing agents
Decomposition Products: Nitrogen and sulfur oxides, sometimes small amounts of unrecognized toxic fumes in confined burns
Acute Oral Toxicity: LD50 in rats over 5000 mg/kg—relatively low hazard by ingestion in small doses
Dermal Toxicity: Little evidence of harm from skin exposure; LD50 over 2000 mg/kg
Eye Irritation: Mild and temporary; no permanent damage expected in healthy adults
Chronic Effects: No known mutagenic, carcinogenic, or reproductive risks at typical agricultural exposure
Operator Reports: Farm workers rarely report issues beyond transient skin irritation, unless handling large spills without gloves
Environmental Fate: Moves easily through certain soils—can leach into groundwater in sandy areas with heavy irrigation
Persistence: Degrades in soil by microbial action; half-life averages 2-5 months, depending on soil warmth and moisture
Bioaccumulation: Low potential for bioaccumulation in wildlife or edible plants
Aquatic Toxicity: Toxic to certain algae, aquatic plants; low risk to fish and aquatic invertebrates at recommended farm rates
Drift Risks: Spray drift to non-target habitats sometimes suppresses native wildflowers and marsh plants for a full season
Mitigation: Planting buffer strips, or switching to spot treatments, helps control runoff and reduce water table contamination, especially in Midwest farming regions
Container Disposal: Triple-rinse empty containers before discarding; comply with local pesticide container recycling programs if they exist
Product Disposal: Never pour leftovers into watercourses or drains; unneeded concentrate goes to approved hazardous waste collection points
Residue Handling: Small quantities can sometimes be used up on labeled crops to avoid waste; large leftover volumes must follow regional environmental guidelines
Shipping Description: Not considered dangerous goods by most transport agencies in standard packaging
Precautions: Keep containers upright and tightly closed, shielded from weather and sunlight
Accident Protocol: Clean up minor spills with absorbents; inform local responders if major truck spills occur, especially near watercourses
Labeling: U.S. DOT requires standard pesticide transport tags, but no flammability or toxicity symbol for most imazethapyr concentrates
Registration: Registered by EPA in the United States and several other nations; requires compliance with all pesticide labeling and notification rules
Residue Tolerances: Strict limits govern the maximum permitted residues in food crops—regular monitoring in exported soybeans and legumes
Pesticide Use Controls: Application restrictions prevent use in or near certain water bodies, endangered plant habitats, or during high-wind conditions
Worker Safety: Must observe minimum reentry intervals—usually 4 hours in soybeans—after application on commercial farms
Environmental Reporting: Large accidental releases or suspected groundwater contamination must be reported to regional environmental protection agencies
