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Determination of chlorite at very low levels by using differential pulse polarography

✍ Scribed by S. Nakareseisoon; S. Tachiyashiki; J. Benga; G.E. Pacey; G. Gordon

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 619 KB
Volume: 204
Category: Article
ISSN: 0003-2670
DOI: 10.1016/s0003-2670(00)86356-4

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✦ Synopsis

A method is reported for the determination of pg 1-i levels of chlorite by using differential pulse polarography. The electrochemical reduction of chlorite was studied between pH 3.7 and 14 and in an ionic strength range of 0.05-3.0 M. The optimum conditions are pH 4.1-4.4 and an ionic strength of 0.45 M. The current under these conditions is diffusion-controlled and is a linear function of chlorite concentration ranging from 2.77 x 1O-7 to 2.80 x 10e4 M (19 pg 1-i to 19 mg 1-l). The imprecision is better than + 1.0% and + 3.4% at concentrations of 2.87~ 10m5 M and 1.74 x 10e6 M, respectively, with a detection limit of 1 X 10e7 M (7 pg l-') . An interference study and the application of this method for determining chlorite in drinking water are reported.

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