Electrochemical Determination Of Simazine Using Clay Modified Carbon Paste Electrode

The electrochemical behavior of simazine (triazinic herbicide) was investigated byrncyclic voltammetry at clay modified carbon paste electrode. The appearance of twornfold peak current obtained at clay modified carbon paste electrode was used as anrnanalytical signal for developing differential pulse adsorptive stripping voltammetricrnmethod for the determination of simazine using clay modified carbon paste electrode.rnSystematic and detailed studies of various experimental conditions were conducted tornestablish the optimal clay amount, pH of solution and instrumental parameters. Arnlinear dependence between peak current and concentration of simazine was observedrnfor concentrations between 1.0 Ñ… 10-6 M to 20 Ñ… 10-6 M. At higher concentrationsrn(20 Ñ… 10-6 M to 80 Ñ… 10-6 M), another linear dependence was observed. The relativernstandard deviation for six successive determinations were 3.3 and 2.58% for 2.0 Ñ… 10-6rnM and 20 Ñ… 10-6 M simazine, respectively. The detection limit (concentration equal tornthree times the standard deviation of peak current) was 0.25 Ñ… 10-6 M. The developedrnmethod was applied to the direct determination of simazine in spiked potable waterrnsample with satisfactory result.rnKeywords: Voltammetry, Herbicides, Simazine, Clay, Carbon paste electrode.

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