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CAS Number: 52645-53-1
Synonyms: 3-phenoxybenzyl (IRS)-cis, trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
Contaminant Type: Chemical

Permethrin is a contact insecticide used for a broad range of insects in agriculture, forestry and public health. [1434]

Surface waters may become contaminated by permethrin applied directly to water for mosquito control purposes, in discharges from production plant and from agriculture. [1434]

Permethrin is rapidly degraded in soil by hydrolysis and microbial action under aerobic conditions. Similar reactions occur under anaerobic conditions also. The half-life in soils is approximately 28 day, and 10 days in plants. [1434]

Human exposure is low, and the World Health Organization has classified permethrin as "moderately hazardous." [1434]

Studies in which rats, mice, rabbits, guinea-pigs and dogs received repeated administration by the inhalation, oral and dermal routes showed that the main effects of technical-grade permethrin are on clinical signs, especially tremor and hyperexcitability, body weight and liver weight. [1434]

Permethrin is used in the UK at doses between 10 and 20 ug/L to control aquatic invertebrates in water mains. [1433]

Very limited data are available regarding treatment for the control of permethrin in drinking water. It has been noted that permethrin readily adsorbs to many materials in the natural environment and is generally not present in raw water. It is generally considered that permethrin would be removed by conventional treatment methods. [1434]

Date of Literature search: 2009

1433 Fielding, M., Haley, J.; 1989; Aqueous Chlorination of Permethrin; Water Research ; 23:4:523-524; Input May 2009
1434 WHO: World Healthcare Organization; 2005; Permethrin in Drinking-Water; WHO Guidelines for Drinking Water Quality; Pg. 1-5; Input May 2009