Electrochemical Determination Of Catechol In Tea Amples Using Anthraquinone Modified Carbon Paste Electrode

The electrochemical behavior of catechol was investigated using square wavernvoltammetry with anthraquinone modified CPE and was found to be very sensitive. Thernmodified electrodes showed an enhancement of current response for catechol asrncompared to the unmodified carbon paste electrode. Two varieties of tea, namely Greenrntea, and Wush Wush tea were investigated. Responses for the extracts using ethanol:rnwater mixture showed green tea to be superior in catechol content.rnOptimization of different variables such as pH of working solution, modifier compositionrnand square wave parameters such as frequency, amplitude and step potential were madernto improve the method efficiency during the experiment. The reproducibility for the ninernrepeated analysis of 80 μmolL-1 of catechol gave a relative standard deviation of 3.65%,rnindicating excellent reproducibility of the method. Linear calibration plots were obtainedrnin the range 6 to 80 μmolL-1 with (R = 0.99853) and the detection limit with (S/N=3) wasrnas low as 2.155x10-7 molL-1

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