Determination of Hypochlorite by Micro-sequential Injection-Chemiluminescence with Sensitization by 5-Sulfosalicylic Acid

Micro-sequential-injection chemiluminescence determination of hypochlorite based on the CL reaction between luminol and sodium hypochlorite was reported. In an acidic medium, CL intensity of the above reaction system was remarkably enhanced by the presence of 5-sulfosalicylic acid. Linear relationship between magnitude of increase in CL intensity and mass concentration of sodium hypochlorite was obtained in the range of 0.6-10 μmol·L-1. Detection limit (3S/N) was found to be 0.06 μmol·L-1. Using 3 water samples as matrixes, tests for recovery and precision were made by standard addition method, values of recovery and RSD′s (n=5) found were in the ranges of 94.1%-101% and 1.4%-2.3% respectively.