Determination of dissolved sulphides in waste water samples by flow-through stripping chronopotentiometry with a macroporous mercury-film electrode |
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Authors: | Manova A Strelec M Cacho F Lehotay J Beinrohr E |
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Affiliation: | Slovak University of Technology, Institute of Analytical Chemistry, Radlinskeho 9, 812 37 Bratislava, Slovakia |
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Abstract: | Sulphides in water samples were determined by stripping chronopotentiometry in a computer controlled flow system with a flow-through electrochemical cell. The working electrode was a porous glassy carbon electrode coated with Nafion and mercury. The sample was diluted with 0.1 mol L−1 NaOH and analysed. Sulphides in the sample were collected in the porous electrode as mercury sulphide and then stripped by a current of −500 μA. The limit of detection was found to be 1.6 μg L−1 and 0.5 μg L−1 for 1 mL and 5 mL of preconcentrated sample, respectively. The linear range for 1 mL sample was found to be 5-400 μg L−1. The repeatability and reproducibility was found to be 2.6% and 4.8%, respectively. The method was applied to analyses of waste water samples from a tannery. |
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Keywords: | Sulphide Waste water Tannery Stripping chronopotentiometry |
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