Abstract
The authors have examined how fluorescent brightening agents disappear in an urban river, the Nogawa, after discharge from domestic sources.The behaviors of two typical fluorescent brightening agents (FBA-1 and FBA-2, see Table 1 for the chemical structures) for detergent in a river were proved to differ from each other. For FBA-1, the main disappearance factor was found to be photofading, on the other hand, for FBA-2, the main factor could not be specified. The transport ratios of the fluorescent brightening agents in the river were 87% for FBA-1 and 15% for FBA-2, respectively. Mass balance of the fluorescent brightening agents built in detergent was estimated from these results.
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