Abstract
Recommended spectrophotometric procedures for chlorine are investigated and are found to have significant disadvantages, thus a new method for the spectrophotometric determination of free chlorine in the presence of other chlorine species, viz. chlorine dioxide, chlorite, chlorate and combined chlorine, based on Acid Yellow 17, has been developed. Only chlorine dioxide interferes. The detection limit is 50 ng ml −1 for free chlorine, and the calibration graph is linear up to at least 1.0 μg ml −1. Cyclic voltammetry has been used to explain the findings of the spectrophotometric work.
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