Direct determination of arsenic in urine by differential pulse anodic stripping voltammetry
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Various parameters affecting the behaviour of arsenic in differential pulse anodic stripping voltammetry (Dpasv) have been studied, such as the electrodeposition potential, working electrode, electrolysis time and the nature of the electrolyte solution. It was found that under suitable conditions arsenic(III) can be determined directly in diluted urine byDpasv. For the quantitative determination of arsenic(III) in urine calibration curves were recorded and recovery experiments have been carried out. A detection limit of 20Μg As/l has been found and in the concentration range of 0.3–1.0 mg/l the coefficient of variation was better than 5%.
From the metallic interferences tested only bismuth at concentrations higher than 0.1 mg/l appeared to be able to influence the arsenic signal.
KeywordsArsenic Differential Pulse Arsenic Trioxide Saturated Calomel Reference Electrode Electrolysis Time
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