Methyl mercaptophos

Methyl mercaptophos is an organophosphorus compound used as an insecticide and acaricide. It is a colorless liquid with a strong odor, and it is highly toxic to humans and animals.

Chemical Properties

Methyl mercaptophos is a phosphorothioate ester of methanol and phosphoric acid. It has the chemical formula C2H8O3PS. It is a colorless liquid with a strong odor, similar to that of garlic or rotten eggs. It is soluble in water and most organic solvents.

Uses

Methyl mercaptophos is primarily used as an insecticide and acaricide. It is effective against a wide range of insects and mites, including aphids, mites, and whiteflies. It is also used in the control of mosquitoes and other vector-borne diseases.

Toxicity

Methyl mercaptophos is highly toxic to humans and animals. Exposure can occur through inhalation, ingestion, or skin contact. Symptoms of exposure include nausea, vomiting, diarrhea, abdominal pain, and in severe cases, seizures, coma, and death. It is also a potent cholinesterase inhibitor, which can lead to respiratory failure and death.

Environmental Impact

Methyl mercaptophos is highly toxic to aquatic life and birds. It is also persistent in the environment, with a half-life of up to several months in soil and water. It can also bioaccumulate in fish and other aquatic organisms.

Regulation

Due to its high toxicity and environmental persistence, the use of methyl mercaptophos is heavily regulated in many countries. In the United States, it is classified as a Restricted Use Pesticide (RUP) by the Environmental Protection Agency (EPA).

See Also

• Organophosphorus compound
• Insecticide
• Acaricide
• Environmental Impact of Pesticides
• Toxicity of Pesticides