Poly(3,4 –Ethylenedioxythiophene ) (PEDOT) Modified Glassy Carbon Electrode for the Voltammetric Determination of Diazinon
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Date
2010-07
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Addis Ababa Universty
Abstract
A glassy carbon electrode (GCE) is modified with PEDOT and its
application for differential pulse voltammetry (DPV) detection of diazinon
,DZN ( organophosphate pesticide) is observed. The PEDOT shows a
strong affinity toward diazinon molecule which provides sensitivity for
the modified GCE. Instrumental and Chemical parameters influencing
the voltammetric response are optimized for diazinon determination .
Under Optimum experimental condition the peak current is linear to
diazinon concentration over the range of 20μM to 80μM with a
correlation coefficient of 0.99866. The limit of detection based on three
times the standard deviation of the blank (3Sb) was 4.245x 10-6M.
The recovery values for sample tap-water solution containing low ,middle
and high concentration of diazinon (50μM, 60 μM & 80 μM) were
95.24%,88.4% & 81.29%; respectively. Thus this modified electrode is
considerably applied for the determination of DZN in tap-water sample.
Key words : Diazinon , differential pulse voltammetry, PEDOT , GCE
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Keywords
Diazinon ; differential pulse voltammetry; PEDOT ; GCE