Although oxamic acid has been identified as an ozone oxidation product from several precursor compounds, concentrations for drinking water have not been published previously. This study shows results from a full-scale drinking water treatment plant, noting that the mean concentrations for oxamic acid reached 21.3 g/L after ozonation and prior to filtration. Subsequent multiple-layer filtration removed 85 of oxamic acid on average, and mean concentrations in drinking water were 2 g/L. Up to 5.9 of the oxamic acid found in ozone-treated groundwater may be formed from Chloridazon metabolites.
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