Mutagenic activity of pollutants in chlorine-disinfected water in relation to the TOC and ammonium ion content in water

摘要

Nine samples of coagulated and filtered river water were addnl.purified by adsorption on activated C,artificially polluted with natural humic substances (org.C content 2-6 mg/L) and with NH4CI (NH3 content 0.1-1.0 mg/L),disinfected with C/2 under lab.conditions and filtered through Am-berlite XAD sorbent beds to remove Cl-contg.org.compds.Presence of mono,di and trichloroacetic acids and other chloroorg.compds.in the Cl-disinfected water was eviden-ced.The compds.were recovered by Me2CO leaching and tested for mutagenic activity on Salmonella typhimurium TA100 strain (Ames assay) both with and without metabolic activation with a microsomal fraction.Only the water sam-ples contg.2 mg/L of org.C showed no mutagenic effect irrespective on the NH3 concn.and metabolic activation.