What happens to diazinon when it enters the environment?

Diazinon may enter the environment from agricultural and household application of the chemical to control insects.

After Diazinon has been applied, it may be present in the soil, surface waters (such as rivers and ponds), and on the surface of plants.

How Diazinon breaks down

Air
Diazinon is rapidly broken down to a number of different compounds.
Water and soil
Diazinon is quickly broken down in a few hours to 2 weeks.
Plants and animals
Diazinon is rapidly broken down by most animals that eat it and is not likely to build up to high or dangerous levels in animals or plants that you might eat.

Diazinon applied to soils can last for weeks or even months depending on the soil environment. Diazinon has the potential to dissolve in water, move through soils and contaminate groundwater. It was commonly found in drinking water sources before the phase-out of residential uses in 2004. Since the phase-out, diazinon has been detected in drinking water sources much less often.

Bacteria, sunlight and other chemical reactions break down diazinon in the environment over time into other chemicals. After diazinon has been applied, some of the Diazinon can escape into the surrounding air, a process called volatilization. Diazinon can be taken up by plants and moved throughout. The amount of Diazinon in or on plants will decrease over time as the diazinon is broken down by the plant and by the environment.

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