Investigation of a sensitive voltammetric method for determination of chromium (VI) in presence of chromium (III) and its application to leather
نویسندگان
چکیده
The determination of chromium(VI) at high concentrations can be performed spectrophotometrically with 1,5-diphenylcarbazite. The standard determination methods for chromium(VI) in leather like DIN53314 or IUC 18 have a detection limit of 3mg/kg leather. However the detection limit is not enough for lower concentrations. There is a need for lower detection limits because public awareness of hexavalent chromium has increased recently. Voltammetry is an increasingly popular technique that in many instances offers unrivalled detection limits even when compared to vastly more expensive analytical techniques. The aim of this study is application of a very sensitive procedure of chromium(VI) determination in the presence of chromium(III) by CCAdSV (Catalytic Cathodic Adsorptive Stripping Voltammetry). The method is based on the measurement of the current obtained from the reduction of chromium(III)-DTPA (diethylentriaminepentaacetic acid) complex adsorbed at the surface of the mercury drop in the presence of nitrate.
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