Stripping Square Wave Voltammetry For The Determination Of Uric Acid In Human Urine Using Fe3 Doped Zeolite Graphite Powder Composite Modified Glassy Carbon Electrode

A novel stripping square wave voltammetric method has been developed for the determinationrnof uric acid (UA) in untreated human urine using iron (III) doped zeolite/graphite powderrncomposite modified GCE. The synergetic effects of the catalytic role of Fe3+, larger surface arearnof zeolite, and higher conductivity of graphite powder account for the anodic peak currentrnobtained at much lower positive oxidation potential than at the bare GCE. The proposed methodrnis simple, rapid, has excellent selectivity, reproducible and sensitive in the linear range of 2–80rnμM UA with a detection limit of 2.3 x 10-7 mol L-1. The developed method enabled to achievernrecoveries ranging from 90.98 to 106.77% of spiked standard UA from untreated human urinernwith a standard error of less than unity.rnKey words: Zeolite NaY (zeolite), Iron doped zeolite, undoped zeolite, stripping SWV,rnchemically modified electrode (CME), uric acid (UA), human urine, polystyrene, dichloroethane,rntetrahydrofuran (THF)

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