Browsing by Author "Yifru Alemayehu"

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    Poly(3,4 –Ethylenedioxythiophene ) (PEDOT) Modified Glassy Carbon Electrode for the Voltammetric Determination of Diazinon
    (Addis Ababa Universty, 2010-07) Yifru Alemayehu; Admassie Shimelis (PhD)
    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