Abstract

Abstract p‐Hydroxybenzaldehyde, one of components of humic substances, were chlorinated after preozonation. Mutagenic aldehydes, such as formaldehyde, acetaldehyde, glyoxal, glyoxylic acid and methylglyoxal were detected in residual water layer after ether extraction. With the elevation of added chlorine dose, glyoxal, glyoxylic acid and methylglyoxal decreased, but formaldehyde and acetaldehyde increased.

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