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A very sensitive electrochemical stripping procedure for azinphos-methyl (Guthion) is reported. Accumulation is achieved by adsorption of the compound on a hanging mercury drop electrode. The adsorptive stripping response was evaluated with respect to accumulation time and potential, concentration dependence, electrolyte and other variables. The determination limit is 0.2 ng ml?1 after 300 s accumulation and 0.4 ng ml?1 after 180 s accumulation. The procedure was applied to spiked river water. 相似文献
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Performance of two monoclonal immunoassays in mixtures of cross-reacting dithiophosphorus pesticides
A statistical approach for the analysis of complex samples by immunoassay is proposed in this article. Two enzyme-linked immunosorbent assays (ELISAs), one of them in the conjugate-coated format and the other in the antibody-coated format, were evaluated for their suitability to the analysis of mixtures of three organodithiophosphorus pesticides: azinphos-methyl, azinphos-ethyl and phosmet. It was found that the apparent affinity of the antibody to each analyte changed in the presence of a cross-reacting compound in the antibody-coated ELISA format, but not when the conjugate-coated ELISA format was used. The assays were thereafter applied to the analysis of mixtures of the three recognized pesticides. With the conjugate-coated ELISA format, accurate and precise determinations of mixtures could be performed if an azinphos-methyl standard curve was employed, with recoveries between 71% and 130% and with coefficients of variation lower than 12.7%. Neither accurate nor precise measurements could be accomplished with the enzyme immunoassay using the antibody-coated ELISA format, independently of the standard curve used. It is thought that the study presented here will have applicability in a variety of cases where the analytical goal is semiquantitative screening based on the total quantity of an unknown mixture of related compounds. 相似文献
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