Abstract
Several sulphone-phthalein indicators have been examined to test their possible application as redox indicators in titrations with hypochlorite, bromate, iodate and chloramine-T. It was confirmed that Cerana's indicator, Bromothymol Blue, is an excellent reversible indicator for titrations with hypochlorite. Bromocresol Purple is possibly slightly better. Cresol Red, Xylenol Orange, Thymol Blue and Methyl Thymol Blue are also suitable, but there is little point in using them, because the first two are converted to Bromocresol Purple and the last two to Bromothymol Blue. In the remaining systems the indicators were inferior to or no better than conventional indicators.
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