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Scientists target microorganisms to break down toxic pesticide

MADISON, WI, JANUARY 16, 2003 A pesticide used extensively all over the world is receiving attention these days more for methods being used to clean it up than for its use as chemical to control insects and mites.

Endosulfan, classified as an organochlorine (the same family as DDT), is registered for use as a pesticide on 60 U.S. crops. Its residues have been found in the atmosphere, soils, sediments, surface and ground waters, and food. It is one of the most commonly detected pesticides in U.S. water (38 states) and is rated by the Environmental Protection Agency as a Category 1 pesticide with extremely high acute toxicity. Endosulfan affects the central nervous system, kidney, liver, blood chemistry and parathyroid gland and has reproductive, teratogenic and mutagenic effects.

Total average annual use of endosulfan is estimated at approximately 1.38 million pounds of the active ingredient. Endosulfan and its breakdown products are persistent in the environment with an estimated half-life of 9 months to 6 years. Because it is a persistent organic pollutant (POP) that enters the air, water, and soil during its use and manufacture, scientists have been researching ways to safely and effectively breakdown this neurotoxin.

Researchers from the University of California-Riverside and the University of Agriculture, Faisalabad, Pakistan, recently identified specific microorganisms which can breakdown the toxicity of endosulfan. Detoxifying pesticides through biological means is receiving serious attention as an alternative to existing methods, such as incineration and landfill, which are not sufficient for large, contaminated sites. By identifying microorganisms to specifically degrade endosulfan, these researchers were able to drastically reduce the toxic residues in the soil. The results of this study are published in the January-February issue of the Journal of Environmental Quality.

Various environmental samples were collected from diff
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Contact: Sara Uttech
suttech@agronomy.org
608-273-8080
American Society of Agronomy
16-Jan-2003


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