Overview
Malathion is an organophosphate insecticide first registered for use in the United States in 1956. It functions as an acetylcholinesterase inhibitor, disrupting the nervous system of insects. The compound is valued for its relatively low persistence in the environment compared to chlorinated hydrocarbons and its effectiveness against a wide range of pests. While malathion is less toxic to mammals than many other organophosphates, it still requires careful handling. Its use is regulated in many countries, with specific application rates and safety protocols established for agricultural and public health applications.
Physical and Chemical Properties
Malathion is a chiral compound that exists as two enantiomers, though the technical product is typically a racemic mixture. The substance is stable under normal storage conditions but decomposes in alkaline environments (pH > 7) and at elevated temperatures. Hydrolysis is a significant degradation pathway, with the half-life in water varying from days to weeks depending on pH and temperature. The insecticide has a vapor pressure of 1.78 × 10-5 mmHg at 30°C, indicating moderate volatility. Its octanol-water partition coefficient (log Kow) of 2.36 suggests moderate lipophilicity, influencing its environmental distribution and bioaccumulation potential.
Main Applications
In agriculture, malathion controls sucking and chewing insects on fruits, vegetables, and field crops. It's particularly effective against aphids, spider mites, and thrips. Formulations include emulsifiable concentrates, wettable powders, and ultra-low volume (ULV) sprays for aerial application. For public health, malathion is a key tool in mosquito control programs, helping combat malaria and other vector-borne diseases. The World Health Organization includes it in its list of essential medicines. Veterinary applications include ectoparasite control on livestock and in poultry houses.
Safety and Storage
Malathion is classified as a U.S. EPA Toxicity Category III compound (slightly toxic) for acute oral and dermal exposure. However, chronic exposure or high doses can cause typical organophosphate poisoning symptoms. Proper PPE including chemical-resistant gloves, goggles, and respirators should be used during handling. Storage requires corrosion-resistant containers in well-ventilated areas below 30°C. Incompatible materials include strong oxidizers and alkaline substances. Spill management should use absorbent materials like vermiculite, with contaminated areas washed thoroughly. Disposal must follow local hazardous waste regulations.
B2B Procurement Guide
When procuring malathion, buyers should specify technical grade (typically 95% purity) or formulated products (emulsifiable concentrates commonly at 50-57% active ingredient). Packaging options range from 200L steel drums to bulk Isotanks for large-scale purchases. Key procurement considerations include verification of Certificate of Analysis (including impurity profile), compliance with destination country regulations (such as EPA registration in the U.S. or EU pesticide approvals), and supplier capability to provide Safety Data Sheets (SDS) and technical support. Lead times vary seasonally, with prices fluctuating based on raw material (dimethyl dithiophosphoric acid) costs and demand patterns.
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