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Name: Monocrotophos
Chemical Class: Organophosphate insecticide
Common Form: Soluble liquid concentrate
CAS Number: 6923-22-4
Odor: Faint, somewhat chemical
Uses: Most agricultural setups use this to control pests in cotton, rice, sugarcane, peanuts, and other crops. The focus on using it in major farming regions comes from how quickly it knocks down chewing and sucking insects.
Acute Hazards: Highly toxic if swallowed or absorbed through the skin; can cause death or serious harm even at low exposure. Headaches, sweating, muscle twitching, blurred vision, and drooling can set in fast.
Chronic Hazards: Long-term contact could damage nerves, make people sensitive to small doses, and possibly affect reproductive health.
Environmental Risks: Kills fish, birds, and bees; easily moves through water and soil, poisoning non-target species.
Classification: Classified as hazardous in most regulatory systems for acute toxicity.
Active Ingredient: Monocrotophos (concentration typically 36-40%)
Solvents: Often includes xylene or other hydrocarbon solvents.
Impurities: May contain trace contaminants from manufacturing.
Formulation Components: Wetting agents or surfactants often added for mixing and spreading.
If Swallowed: Rinse mouth; give water if alert but never induce vomiting. Medical help should step in immediately; medical teams may use atropine or pralidoxime as antidotes.
If on Skin: Take off contaminated clothing right away; rinse skin thoroughly with soap and plenty of water for at least 15 minutes.
If Inhaled: Bring the person to fresh air. If breathing slows or stops, give artificial respiration. Oxygen and medical care are essential.
If in Eyes: Wash eyes with running water, lifting eyelids, for at least 15 minutes; seek immediate ophthalmic evaluation.
Note: Early symptoms can snowball into crisis within minutes. Always keep a response plan in areas where people use monocrotophos.
Extinguishing Media: Dry chemical, foam, or carbon dioxide can tackle small fires; for big fires, use water spray.
Hazardous Combustion Products: Burning produces toxic fumes, including phosphoric oxides, nitrogen oxides, and carbon monoxide.
Protective Gear: Firefighters should wear self-contained breathing apparatus and chemical-resistant suits.
Other Risks: Runoff from firefighting can contaminate water bodies drastically, so crews need to dam up and contain water where possible.
Personal Protection: Respirators, protective gloves, and eye protection are non-negotiable during cleanups.
Containment: Stop leak when safe; prevent it from reaching sewers, drains, and streams.
Clean-Up: Soak up small spills with sand, earth, or vermiculite, shovel into secure chemical waste containers.
Decontamination: Wash area thoroughly with water and detergent to knock down residues.
Disposal: Treat everything—absorbents, clothes, debris—as toxic waste.
Handling: Always use it in well-ventilated spots, never eat or smoke in the area. Keep direct contact to an absolute minimum. Protective clothing—including eye shields, gloves, boots, and dedicated coveralls—makes a vital layer of defense.
Storage: Lock up away from food, drink, animal feed, and children. Store it in tightly-sealed containers, far from any flame or direct sunlight.
Incompatibilities: Avoid storing alongside strong oxidizers, acids, or alkaline materials, as the mix could spark spills or toxic gas release.
Ventilation: Growers and handlers must work with fume hoods or exhaust fans; open-air work is safer, but wind can blow droplets onto skin.
Personal Protective Equipment: Rubber gloves, goggles, face shields, long-sleeved chemically resistant outerwear, and boots. Respiratory protection can make all the difference, especially during mixing or spraying.
Personal Hygiene: Wash hands and face before eating, drinking, or using toilets. Don’t wear contaminated clothing home.
Exposure Limits: Some regulators set strict air exposure ceilings, but the safest approach is to keep any exposure as close to zero as possible.
Appearance: Colorless to pale yellow liquid or crystalline solid.
Odor: Faintly chemical.
Solubility: Easily dissolves in water and most organic solvents.
Boiling Point: Lies around 80-85°C (for solution form).
Stability: Breaks down under strong acids, bases, or high heat.
Density: Varies with formulation, typically around 1.2 g/cm³.
Chemical Stability: Remains stable at ordinary storage temperatures and conditions. Readily decomposes under acidic or strongly alkaline conditions.
Dangerous Reactions: Reacts with oxidizers and acids to release highly toxic gases.
Hazardous Decomposition: Heating or burning produces organophosphate breakdown products, which can be just as or even more toxic than the parent chemical.
Incompatibility: Mixing with anything basic or oxidizing causes rapid reaction and risks runaway spills or dangerous vapor clouds.
Acute Toxicity: Extremely toxic by mouth, skin contact, or inhalation. Symptoms include weakness, excessive salivation, constricted pupils, muscle spasms, and—in bad cases—respiratory failure.
Chronic Effects: Extended exposure may lead to nerve damage, memory loss, and increased susceptibility in future exposures.
Sensitization: Rare, but repeated exposure raises sensitivity.
Carcinogenicity: There is not enough evidence for cancer in humans, but long-term effects on nerve cells are well documented.
Toxicity to Aquatic Life: Lethal to fish at very low concentrations; survives in water for days or weeks, extending its hazard window.
Impact on Birds and Bees: Bird and bee populations can plummet when exposed; bees die off within moments of contact, and residues hurt nest health.
Mobility: Spreads quickly through soil and surface water, turning up far beyond original application sites.
Bioaccumulation: Unexpected persistence in soil can lead to build-up in local food webs.
Degradation: Sunlight, microbes, and rain eventually break it down, but not before it poses a risk to wildlife and humans.
Product Waste: Do not dump leftovers on fields, gardens, or down drains. Specialized hazardous waste services ensure safe destruction.
Contaminated Packaging: Rinse triple times, then puncture and deliver to hazardous waste collection sites.
Legal Controls: Agriculture law often requires documented tracking and certification for every kilogram destroyed.
Environmental Precaution: Every bit that enters the water or waste stream adds to the public health risk and environmental load.
UN Number: Classified as dangerous goods; check with national and international regulations for the proper shipping number.
Shipping Name: Organophosphorus pesticide, liquid, toxic
Hazard Class: Toxic substances classification in bulk shipments
Packing Group: Strict controls for leaks, packaging integrity, and driver/operator training shape every shipment.
Special Provisions: Vehicles must carry emergency equipment and warning placards.
Global Controls: Banned or heavily restricted in many countries due to its severe toxicity and environmental persistence.
Worker Protection Standards: Special training and welfare rules shape use and disposal; personal protective equipment and strict supervision make up front-line rules.
Labelling: Skull-and-crossbones warning signs, plain-language hazard instructions.
Reporting: Spills, poisoning events, or mishandling often require mandatory reporting to authorities, even in small amounts.
Permitted Uses: In some places, only licensed professionals may handle, transport, or apply it, and only for specific crops to limit damage.
