Abstract
A new titrimetric method for the determination of 3- p-anisyl-, 3-(3′-bromo-4′-hydroxyphenyl)-, and 3-(4′-hydroxyphenyl)phthalides and phenolphthalein has been developed. The method is based on their reaction with an excess of bromine to form hypobromites. After the removal of the excess bromine with formic acid, the hypobromites are treated with iodide to liberate an equivalent amount of iodine, which can be determined titrimetrically with thiosulfate using starch as an indicator. The recovery range is 96.5–100.4% and the coefficient of variation is 0.4–1.5% depending on the concentration levels of the studied compounds.
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