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Abstract
The electrochemical determination of six pesticides by adsorptive stripping voltammetry is described. These pesticides are the following: the nitrated organophosphates Methyl Parathion, Parathion, Dicapthon and Fenitrothion, the asymmetrical triazine Guthion and the s-triazine Simetryne. Analytical response as a function of variables such as accumulation potential, accumulation time and pH is presented. The technique is shown to be 20–50 times more sensitive than analysis by DPP without prior accumulation. Relative standard deviations at the 10−7 M level are less than 3%. Due to sufficient electrochemical resolution, the technique can be applied to the analysis of three pesticides in the same solution. Results are reported for a variety of environmental samples. High concentrations of either electrolyte or co-adsorbants are shown to interfere. Detection limits are presented.