Abstract
A reliable and sensitive stopped-flow injection method is described for the determination of hydrogen peroxide, cumene hydroperoxide and tert-butyl hydroperoxide. It is based on the oxidation of leuco-phloxin to the fluorescent phloxin by hydroperoxide and haematin. Linear calibration graphs were obtained between 4 × 10 −6 and 8 × 10 −5 m , with a sampling-rate of 25 samples h −1. The detection limit, defined as three standard deviations of the reagent blank, was 1.5 × 10 −7 m . The usefulness of the method was tested in the determination of lipohydroperoxides in six commercial oil samples and of hydrogen peroxide in six milk samples of different levels of skimming. The results agreed closely with those obtained by the iodometric method.
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