title: Change of genotoxicity for raw and finished water: role of purification processes.
abstract: In China, the safety of drinking water becomes a significant issue due to serious aquatic environmental pollution. The genotoxic levels of raw and finished water from seven typical waterworks located in the five basins in China were then evaluated using umu test. Effect of conventional treatment processes (coagulation, filtration and disinfection) on the genotoxicity and the fate of dissolved organic matter (DOM) was discussed. The results showed that most of the selected finished water presented genotoxicity at or lower than 300 mL water sample exposure dose. The genotoxic effects of finished water were significantly higher than those of raw water. It also exhibited that there existed higher correlation between genotoxic effect and Br(-) than the other water quality parameters. The brominated trihalomethanes played a more important role in finished water genotoxicity than brominated haloacetic acids. The treatment processes could increase the genotoxic effects of finished water, especially for the chlorination treatment. The fluorescence spectra and high performance size-exclusion chromatogram analysis of DOM characters indicated that the proportion of low molecular weight acids, nitrogen containing aromatics, proteinaceous and microbially derived organic matters (200-300 Da) increased during purification processes, which indicated probably the release or formation of drinking water genotoxins.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. wgds@rcees.ac.cn
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Wang
authors.forename: Zhizhen
authors.initials: Z
authors.lastname: Xu
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Yan
authors.forename: Jian
authors.initials: J
authors.lastname: Shi
mesh_terms: D004202:Disinfectants / Q000633:toxicity; D005618:Fresh Water / Q000737:chemistry; D009152:Mutagenicity Tests; D009153:Mutagens / Q000633:toxicity*; D012486:Salmonella typhimurium / Q000187:drug effects; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D018508:Water Purification
chemical_list: D004202:Disinfectants; D009153:Mutagens; D014874:Water Pollutants, Chemical