Browsing by Author "Gashaw Girma"

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    Water Hyacinth-Derived Activated Carbon Paste Electrode for the Electrochemical Determination of Dopamine
    (Addis Ababa University, 2024-08) Gashaw Girma; Solomon Mehretie
    The electrochemical determination of dopamine gains great interest due to its important role in the central nervous system (CNS) in various neurological disorders. This study explores the development of a non-toxic and cheap activated carbon paste electrode made from water hyacinth. The activated carbon was synthesized from water hyacinth through a carbonization process followed by chemical activation with phosphoric acid, yielding a material with good electrochemical activity. The synthesized activated carbon was then used to fabricate a carbon paste electrode, which was characterized using cyclic voltammetry (CV). The capacity of the water hyacinth-derived carbon paste electrode to quantify dopamine using differential pulse voltammetry (DPV) in phosphate buffer electrolyte solution. The electrode works with a linear range of 1.0–100 μM and a detection limit of 0.1 μM. The electrochemical sensor was applied to urine sample with a recovery range of 97.1-104.0 % result shown that this electrode could serve as an alternative for dopamine sensing to urine samples. It has different applications, including organic fertilizer, mulching, biofuel, and to clean the sewage. Moreover, this study provides a new application that contributes to the development of green technologies in sensors.