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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2085

Title: ELECTROCHEMICAL DETERMINATION OF CATECHOL IN TEA SAMPLES USING ANTHRAQUINONE MODIFIED CARBON PASTE ELECTRODE
Authors: FEKADU, MELAK
Advisors: MESFIN REDI (PhD)
MERID TESSEMA (PhD)
Keywords: chemistry
Copyright: Jul-2009
Date Added: 2-May-2012
Publisher: aau
Abstract: The electrochemical behavior of catechol was investigated using square wave voltammetry with anthraquinone modified CPE and was found to be very sensitive. The modified electrodes showed an enhancement of current response for catechol as compared to the unmodified carbon paste electrode. Two varieties of tea, namely Green tea, and Wush Wush tea were investigated. Responses for the extracts using ethanol: water mixture showed green tea to be superior in catechol content. Optimization of different variables such as pH of working solution, modifier composition and square wave parameters such as frequency, amplitude and step potential were made to improve the method efficiency during the experiment. The reproducibility for the nine repeated analysis of 80 μmolL-1 of catechol gave a relative standard deviation of 3.65%, indicating excellent reproducibility of the method. Linear calibration plots were obtained in the range 6 to 80 μmolL-1 with (R = 0.99853) and the detection limit with (S/N=3) was as low as 2.155x10-7 molL-1.
URI: http://hdl.handle.net/123456789/2085
Appears in:Thesis - Chemistry

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