Kinetic study of the degradation of chlorpyrifos by using a stopped-flow fia system. Semiautomatic determination in commercial formulations.
A kinetic study of the degradation of chlorpyrifos in an oxidative alkaline medium has been undertaken by using a stopped-flow system. A semiautomatic method for determining chlorpyrifos is proposed for the first time. Linear calibration graphs up to 2 x 10(-4)M with a relative standard deviation of 1.8% are obtained. A detection limit of 6.6 x 10(-6)M is reported. Carbaryl, dimethoate and endosulfan have been assayed as interference species. The proposed method has been applied to analyze a commercial formulation.
Espinosa-Mansilla
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Department of Analytical Chemistry, University of Extremadura, 06071 Badajoz, Spain.
Salinas
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Zamoro
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