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A simple, rapid, and sensitive spectrophotometric method has been developed for the determination of hypochlorite using thionin. The method is based on the reaction of hypochlorite with potassium iodide in acidic medium to liberate iodine. The liberated iodine bleaches the violet color of thionin, which is measured at 600 nm. The decrease in absorbance is directly proportional to the concentration of hypochlorite. Beer's law is obeyed in the range 0.2-1.2 µ g/mL of hypochlorite. The molar absorptivity, Sandell's sensitivity, detection limit, and quantitation limit are found to be 1.489 × 10 4 L/(mol cm), 3.25 × 10 -3 µ g cm -2 , 0.1026 µ g/mL, and 0.3112 µ g/mL, respectively. The method has been successfully applied to the determination of hypochlorite in various samples of natural water, tap water, milk, etc.

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