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Product Name: Imazapyr
Chemical Class: Imidazolinone Herbicide
Chemical Formula: C13H15N3O3
CAS Number: 81334-34-1
Common Applications: Imazapyr turns up often in weed control for non-crop land, forestry operations, and some rights-of-way. Its use has spread because it works against a wide range of plants and does not break down as quickly as some older herbicides.
GHS Classification: Eye irritation (Category 2), Skin irritation (Category 2)
Hazard Statements: Causes moderate eye irritation. Prolonged skin contact can cause mild irritation. Swallowing can cause gastrointestinal discomfort.
Symbol: Exclamation mark (irritant)
Potential Health Effects: Eyes may feel dry or have mild burning. Skin contact may give rise to slight redness. Inhalation in dust form, though rare during regular use, can irritate airways. Some folks react faster depending on personal sensitivity. Those spraying the product over large areas might report headaches or nausea if protective gear slips up.
Active Ingredient: Imazapyr (as isopropylamine or ammonium salt)
Concentration: Concentrates tend to hover from 18% to 53%, with diluted mixes far lower
Other Components: Water, surfactants, and solvent carriers mix in, often making up 40-60% of the blend. These ingredients sometimes raise as many questions as Imazapyr itself.
Eye Contact: Rinse carefully with water for at least 15 minutes. Eyelids need lifting for a full wash. Remove contact lenses, then rinse again. If redness sticks around, get medical help.
Skin Contact: Wash exposed skin thoroughly with soap and water. Contaminated clothing heads to the wash before reuse.
Inhalation: Move out to fresh air promptly. Breathing trouble calls for medical attention.
Ingestion: Rinsing the mouth is the smart first step. Stay away from forced vomiting. If symptoms develop, see a health care provider.
Suitable Extinguishing Media: Foam, dry chemical, or carbon dioxide douse flames well. Water spray works best on small fires but risks spreading run-off for larger ones.
Specific Hazards: Burning releases irritating and toxic fumes—mostly nitrogen oxides and carbon monoxide. People on scene need resistant gear and breathing support to avoid serious injury.
Advice for Firefighters: Keep wind at your back. Aim water streams at the base of the flames. Watch for run-off since this can contaminate groundwater or move residues into municipal drains.
Personal Protection: Gloves, goggles, and suitable clothing shield workers from splash risk or contact with residues.
Environmental Precautions: Block off storm drains. Prevent spillage from reaching waterways—herbicides wreak havoc on aquatic plants and small life.
Cleanup Methods: Use absorbent materials like sand or soil to contain small spills. Gather up safely, placing waste in sealed drums. Clean the area with water, keeping run-off contained. Disposal follows a regulated hazardous waste route.
Safe Handling: Always pour or mix outdoors, wearing gloves and protective eyewear. Mixing tanks or sprayers get rinsed out far from private wells or drains. Wash up after use, before food or tobacco hand-offs.
Storage Conditions: Secure the container in a cool, well-ventilated location. Keep far from food, feed, or drinking water. Avoid storing with fertilizers, acids, or oxidizers. Child-safe locks and warning signs cut down the odds of accidental exposure.
Engineering Controls: Good airflow in mixing or application sites drives down inhalation risk. Closed handling systems beat open systems every time.
Personal Protective Equipment: Chemical-resistant gloves last the entire shift. Long sleeves and pants form the next barrier. Goggles or face shields help out in splash-prone jobs. If using fine sprays, especially indoors, a snug-fitting respirator limits dust or vapor exposure.
Hygiene Measures: Washing up before eating, drinking, or smoking keeps residues from lingering.
Appearance: Off-white to tan crystalline powder in pure form; clear to cloudy liquid for many commercial applications
Odor: Mild chemical, sometimes unnoticed
Solubility: Highly soluble in water
pH (1% solution): Ranges from 5 to 7, depending on blend
Melting Point: 230-235°C (pure compound)
Vapor Pressure: Very low under normal conditions
Stability: Stable under normal use and storage
Chemical Stability: Product remains stable in sealed containers at room temperature
Incompatible Materials: Acids, alkalis, and strong oxidizers increase the risk of dangerous reactions. Reactivity picks up if blended with incompatible chemicals.
Decomposition Products: Breaks down primarily into nitrogen and carbon oxides in fire conditions.
Acute Toxicity: Low toxicity to mammals by ingestion or skin contact. Laboratory tests rank the oral LD50 for rats above 5,000 mg/kg, which lands among the lower acute risks for herbicides.
Skin and Eye Irritation: Mild to moderate irritation observed after prolonged or repeated contact. Rashes or redness develop quicker in those who routinely handle the chemical.
Sensitization: Patch tests suggest most users show no allergic skin response, but rare individuals describe itching or burning.
Long-Term Effects: Extended studies have found no clear evidence of carcinogenic, mutagenic, or reproductive toxicity, though long exposure brings questions about subtle effects on kidneys or liver in high-exposure groups.
Aquatic Toxicity: Imazapyr proves toxic to some aquatic plants, with fewer harmful effects on fish or aquatic invertebrates. Algae populations drop when exposed to runoff.
Persistence and Degradability: Breaks down slowly in soil, lingering from weeks to months depending on local conditions—waterlogged or colder ground favors longer persistence.
Mobility in Soil: Moves readily, leaching into lower soil layers and sometimes entering water tables.
Bioaccumulation: Tends not to build up in fish or wildlife.
Waste Treatment Methods: Contaminated material heads to a chemical disposal facility. Never pour leftover material or diluted wash water onto soil or into drains.
Container Disposal: Rinsing three times with water and using rinse water in the next tank mix clears containers for regional recycling. Otherwise, treat as hazardous waste.
UN Number: Not classified as hazardous for overland or sea transport under most regulations.
Packing Group: Usually not assigned.
Precautions: Handle packaging with care. Avoid punctures or leaks. Always label clearly for handlers and emergency crews.
EPA Status: Registered in many countries for regulated applications.
Pesticide Classification: Generally restricted use; only licensed applicators get permission for large-scale use.
Hazard Communication: Product labeling now requires pictograms, risk phrases, and safe-handling guidance. Recordkeeping rules put extra tracking burdens on large users.
Worker Protection: Occupational safety agencies recommend gloves, eyewear, and barriers anytime product gets mixed, poured, or sprayed.
