Flow-injection potentiometric determination of residual chlorine in water

Residual chlorine is measured in water by using a potentiometric system composed of an iodide-selective electrode and a platinum electrode sensing the iodine-iodide ratio. When the sample is added to acidified iodide solution, the cell response is in a logarithmic relation to the iodine concentratio...

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Bibliographic Details
Published in:Analytica chimica acta 1982, Vol.136, p.85-92
Main Authors: Trojanowicz, Marek, Matuszewski, Wojciech, Hulanicki, Adam
Format: Article
Language:English
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Summary:Residual chlorine is measured in water by using a potentiometric system composed of an iodide-selective electrode and a platinum electrode sensing the iodine-iodide ratio. When the sample is added to acidified iodide solution, the cell response is in a logarithmic relation to the iodine concentration which in turn depends on the concentration of residual chlorine. In the flow injection system evolved, 0.1–5.0 mg l -1 residual chlorine can be determined at a rate of 40–60 samples per hour. The results of potentiometric determinations of residual chlorine in tap water compared to spectrophotometric results suggest that the presence of various organic substances is responsible for discrepancies between these measurements.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(01)95366-8