Calibrationless flow-through stripping coulometric determination of arsenic(III) and total arsenic in contaminated water samples after microwave assisted reduction of arsenic(V) |
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Authors: | L’ Jurica A Manová J Dzurov E Beinrohr J A C Broekaert |
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Institution: | (1) Department of Analytical Chemistry, Slovak Technical University, SK-812 37 Bratislava, Slovakia, SK;(2) Institute of Analytical Chemsitry, University of Leipzig, Linnéstr. 3, 04103 Leipzig, Germany, DE |
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Abstract: | A simple and rapid procedure for the calibrationless determination of trace concentrations of As(III) and total As in contaminated
water samples is presented. Arsenic is preconcentrated as As(III) in a flow-through cell with a gold plated porous electrode
and is then stripped anodically by a constant current. The stripping chronopotentiogram is registered and evaluated. The As
concentration is calculated directly from the combined Faraday’s laws. The total As content was determined after converting
all As species to As(III) by microwave-assisted reduction with hydrazine hydrochloride in a closed vessel. The detection limit
was found to be 0.15 μg/L and the linear response range was 0.5 to 10 000 μg/L. Tap water, surface water, and waste water
samples were analyzed.
Received: 14 July 1999 / Revised: 21 September 1999 / Accepted: 24 September 1999 |
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