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Abstract
SOS chromotest was used to determine the mutagenic activity by ozonation and ozonation‐chlorination of humic substances. By ozonation only, mutagenic activity decreased gradually with the progress of ozonation. Also, by ozonation‐chlorination, mutagenic activity decreased compared with chlorination only. But, the mutagenic activity could not be eliminate completely by combination of preozonation and chlorination. We tried to eliminate this mutagenic activity by granular activated carbon (GAC) treatment, but it was not effective.