Journal
TALANTA
Volume 73, Issue 2, Pages 232-236Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2007.03.027
Keywords
hypochlorite determination; flow analysis; spectrophotometry; catalytic decomposition of hypochlorite; bleach analysis
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A new, green method for the determination of hypochloride in bleaching products is here presented. The method, based on a flow injection system and measurement of the native absorbance of hypochlorite at 292 nm, allows the determination of hypochlorite in the range 0.07-0.42 9 Cl-2 l(-1) order to achieve high selectivity a mini-column containing cobalt oxide, which effectively catalyses hypochlorite decomposition to chloride and oxygen, was inserted in the flow system. The difference in absorbance of samples no circulated and circulated through the mini-column was selected as analytical signal; thus, the method only requires 20 mg of solid, reusable catalyst, and a NaOH solution of pH 10.4; providing a sample throughput of 12 samples h(-1) in triplicate injection. Its usefulness for analysis of bleaching products is demonstrated. (C) 2007 Elsevier B.V. All rights reserved.
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