Electrochemical Determination of Simazine Using Clay Modified Carbon Paste Electrode
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Date
2005-06
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Abstract
The electrochemical behavior of simazine (triazinic herbicide) was investigated by
cyclic voltammetry at clay modified carbon paste electrode. The appearance of two
fold peak current obtained at clay modified carbon paste electrode was used as an
analytical signal for developing differential pulse adsorptive stripping voltammetric
method for the determination of simazine using clay modified carbon paste electrode.
Systematic and detailed studies of various experimental conditions were conducted to
establish the optimal clay amount, pH of solution and instrumental parameters. A
linear dependence between peak current and concentration of simazine was observed
for concentrations between 1.0 х 10-6 M to 20 х 10-6 M. At higher concentrations
(20 х 10-6 M to 80 х 10-6 M), another linear dependence was observed. The relative
standard deviation for six successive determinations were 3.3 and 2.58% for 2.0 х 10-6
M and 20 х 10-6 M simazine, respectively. The detection limit (concentration equal to
three times the standard deviation of peak current) was 0.25 х 10-6 M. The developed
method was applied to the direct determination of simazine in spiked potable water
sample with satisfactory result.
Keywords: Voltammetry, Herbicides, Simazine, Clay, Carbon paste electrode.
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Voltammetry; Herbicides; Simazine; Clay; Carbon paste electrode