Quantitative determination of aqueous-phase ozone by chemiluminescence using indigo-5,5'-disulfonate
Indigo-5,5'-disulfonate (IDS) was found to be an efficient reagent for the determination of ozone by chemiluminescence (CL); hence it was applied to the continuous measurements of dissolved ozone (O/sub 3/(aq)). The optimum reagent composition was determined as 10 mg L-1 IDS plus 2 mM phosphate (pH 7.2). The CL intensity was proportional to the O/sub 3/(aq) concentration in the range of 0.025-410 ng mL-1. The detection limit was 0.006 ng mL-1, which is 3 orders of magnitude lower than that obtained by spectrophotometry using IDS as reported previously. The reduction of interferences from aldehydes and hydrogen peroxide was attempted. Furthermore, the mechanism of the CL was discussed from CL and fluorescence spectra measured.
- OSTI ID:
- 5937092
- Journal Information:
- Anal. Chem.; (United States), Vol. 61:6
- Country of Publication:
- United States
- Language:
- English
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OZONE
CHEMILUMINESCENCE
ALDEHYDES
ECOLOGICAL CONCENTRATION
FLUORESCENCE
HYDROGEN PEROXIDE
MEASURING METHODS
SPECTROPHOTOMETRY
HYDROGEN COMPOUNDS
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PEROXIDES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)