Browsing by Author "Seid, Kerem"

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    Voltammetric Determination of Caffeine in Coffee Using Anthraquinone Modified Carbon Paste Electrode
    (Addis Ababa Universty, 2008-07) Seid, Kerem; Tessema, Merid (PhD)
    Anthraquinone modified carbon paste electrode is used for the determination of caffeine in coffee. The optimized pH=12 value gives an advantages of undergoing square wave voltammetry of real sample with less sample pretreatment steps. A linear calibration curve is obtained over 0- 500 M in 0.1 M NaH2PO4 and Na2HPO4 buffer solution with a detection limit (3) of 5 nM. Determination of caffeine in coffee was done by subtracting the background current. (Key words: CMCPEs, anthraquinone)