Metolachlor

Metolachlor is a herbicide and a member of the chloroacetanilide family of chemicals. These chemicals are widely used in agriculture due to their effectiveness in controlling a variety of weed species. Metolachlor is primarily used on corn, soybean, and sorghum crops.

Chemical Structure and Properties

Metolachlor has the chemical formula C15H22ClNO2. It is a yellowish-brown liquid with a slightly sweet odor. The chemical structure of metolachlor includes a chlorine atom, which contributes to its herbicidal properties. Metolachlor is not very soluble in water, but it is highly soluble in most organic solvents.

Mode of Action

Metolachlor works by inhibiting the growth of weed seedlings. It interferes with the plant's protein synthesis, which prevents the plant from growing. This makes metolachlor a pre-emergent herbicide, meaning it is applied to the soil before the weed seeds germinate.

Environmental Impact

Metolachlor is moderately persistent in the environment, with a half-life in soil ranging from 12 to 104 days. It has the potential to contaminate groundwater, especially in areas where the water table is close to the surface. Metolachlor is toxic to some species of fish and aquatic invertebrates.

Health Effects

Exposure to metolachlor can cause irritation to the eyes, skin, and respiratory tract. Long-term exposure can lead to more serious health effects, including damage to the liver and kidneys.

Regulation

In the United States, metolachlor is regulated by the Environmental Protection Agency (EPA). The EPA classifies metolachlor as a Group C, possible human carcinogen.

See Also

• Herbicide
• Chloroacetanilide
• Environmental Impact of Pesticides
• Pesticide Regulation

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