Determination of the pesticide Chlorpyrifos by cathodic adsorptive stripping voltammetry |
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| Authors: | M S El-Shahawi and M M Kamal |
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| Institution: | (1) Department of Chemistry, Faculty of Science at Damiatta, Mansoura University, Damiatta, Egypt, EG;(2) Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt, EG |
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| Abstract: | The adsorption behavior and differential pulse cathodic adsorptive stripping voltammetry of the pesticide Chlorpyrifos (CP)
were investigated at the hanging mercury drop electrode (HMDE). The pesticide was accumulated at the HMDE and a well-defined
stripping peak was obtained at –1.2 V vs Ag/AgCl electrode at pH 7.50. A voltammetric procedure was developed for the trace
determination of Chlorpyrifos using differential pulse cathodic adsorptive stripping voltammetry (DP-CASV). The optimum working
conditions for the determination of the compound were established. The peak current was linear over the concentration range
9.90 × 10–8– 5.96 × 10–7 mol/L of Chlorpyrifos. The influence of diverse ions and some other pesticides was investigated. The analysis of Chlorpyrifos
in commercial formulations and treated waste water was carried out satisfactorily
Received: 10 July 1997 / Revised: 1 April 1998 / Accepted: 6 April 1998 |
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