Determination of dissolved sulphides in waste water samples by flow-through stripping chronopotentiometry with a macroporous mercury-film electrode [An article from: Analytica Chimica Acta]

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Description:
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 0.1molL^-^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@mA. The limit of detection was found to be 1.6@mgL^-^1 and 0.5@mgL^-^1 for 1mL and 5mL of preconcentrated sample, respectively. The linear range for 1mL sample was found to be 5-400@mgL^-^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.