Eight structural components of humic substances were ozonated. Mutagenicity was found on TA 100 with and without S9 mix for allthe ozonated components. Aldehydes, ketones and carboxylic acid were identified as the ozonation products from p-hydroxybenzal dehyde. Among these products, acetaldehyde (AA), formaldehyde (FA), glyoxal (GL), glyoxylic acid (GA) and methylglyoxal (MGL) were mutagenic compounds. The quantitative analysis of these mutagenic aldehydes was performed. GL and GA were main mutagenic products. Granular activated carbon (GAC) treatment after ozonation was performed. Most of the mutagenic aldehydes reduced, but only GL increased.

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