Simultaneous flow-injection measurement of hydroxide, chloride, hypochlorite and chlorate in Chlor–alkali cell effluents

A flow injection method is reported for the simultaneous determination of hydroxide, chloride, hypochlorite, and chlorate ions that exist in Chlor–alkali cell effluents in concentrations ranging from sub-millimolar to several molar. The hydroxide concentration is determined by the heat of neutraliza...

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Bibliographic Details
Published in:Talanta (Oxford) 2000-07, Vol.52 (4), p.623-630
Main Authors: Tian, Kang, Dasgupta, Purnendu K.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
Online Access:Get full text
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Summary:A flow injection method is reported for the simultaneous determination of hydroxide, chloride, hypochlorite, and chlorate ions that exist in Chlor–alkali cell effluents in concentrations ranging from sub-millimolar to several molar. The hydroxide concentration is determined by the heat of neutralization of the injected sample into an acidic carrier stream and the chloride concentration is calculated from the measured conductance data. For the measurement of hypochlorite and chlorate, colorimetric iodometry is used. Iodide is oxidized to iodine by OCl − and ClO 3 − in acid solutions. While room temperature is sufficient for the reaction between OCl − and I −, the reaction between ClO 3 − and I − requires an elevated temperature. The different reaction requirements are utilized to differentiate between NaOCl and NaClO 3, respectively.
ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(00)00399-4