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Electrochemical micro-determinations of thallium(I) and chromium(VI) ions using DPASV and DP polarography

par Vandenbalck, Jean ;Patriarche, Gaston
Référence Science of the total environment, 60, C, page (97-104)
Publication Publié, 1987

Article révisé par les pairs

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Résumé :

Differential pulse anodic stripping voltammetry (DPASV) using a preformed thin mercury film is suitable for the determination of thallium(I) in biological fluids such as urine and saliva and in rainwater. The addition of EDTA is necessary to mask other toxic metals. Chromium(VI) is determined in cements by differential pulse polarography (DPP) and the method is very rapid and selective. The cation, solubilized by stirring the cement with bidistilled water, is available after filtration for DPP determination. Generally, samples analyzed contain between 1 and 12 mg of chromium(VI) per kilogram of cement. The potential peak is -0.19 V vs SCE for the pure chromium(VI) solution and is shifted between -0.25 and -0.30 V vs SCE when chromium(VI) is extracted from cement samples. The detection limit is 0.3 ppm. © 1987.