水中胞嘧啶氯化消毒副产物生成试验及毒性分析  

Experiment and Toxicity Analysis of DBPs Formation in Chlorination of Cytosine in Water

作　　者：张正斌 张诗圣 颜晓姝 林涛[2] ZHANG Zhengbin;ZHANG Shisheng;YAN Xiaoshu;LIN Tao(Jiangsu Changjiang Water Co.,Ltd.,Yangzhou 225009,China;College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]江苏长江水务股份有限公司,江苏扬州225009 [2]河海大学环境学院,江苏南京210098

出　　处：《净水技术》2020年第12期80-86,110,共8页Water Purification Technology

基　　金：国家自然科学基金“饮用水长距离输配中余氯与微生物介导联合作用下卤代腈变化机制与控制研究”(5197080153)。

摘　　要：天然水体和配水系统中的溶解性微生物产物(SMPs)作为消毒副产物(DBPs)的前体物影响饮用水的安全性。以DNA中的含氮碱基胞嘧啶为研究对象,基于氯化反应试验,研究不同反应条件下消毒副产物的生成情况并对其毒性进行分析评估。试验表明,胞嘧啶氯化能够生成包括三氯甲烷、卤乙酸、卤乙腈、三氯硝基甲烷等多种含碳及含氮消毒副产物,且加氯剂量、氯化时间和pH对DBPs的形成具有显著作用。随着加氯剂量和氯化时间的增加,三氯甲烷的产率不断增大,卤乙腈的产率均呈现先上升后下降的趋势。偏碱性条件能够同时有效地抑制胞嘧啶氯化消毒产生的细胞毒性及遗传毒性。卤乙腈的产率可以主导细胞毒性,而三氯硝基甲烷的产率对遗传毒性的贡献最大。试验为控制饮用水生产输送中SMPs污染的DBPs生成提供理论依据。Soluble microbial products(SMPs)as precursors of disinfection byproducts(DBPs)in natural water and drinking water distribution systems may affect the safety of drinking water.Based on chlorination reaction of cytosine,the formation of DBPs under different conditions was studied and the toxicity was evaluated.Results showed that cytosine chlorination could produce many kinds of CDBPs and N-DBPs,including trichloromethane,haloacetic acids,haloacetonitriles and trichloronitromethane.The dosage of chlorine,chlorination time and pH value exhibited significant effects on the yields of DBPs.The alkaline condition could effectively inhibit cytotoxicity and genotoxicity of cytosine chlorination simultaneously.The yields of haloacetonitriles dominated the fluctuation of cytotoxicity,whereas the yield of trichloronitromethane contributed the most to genotoxicity.The experiment provides a theoretical basis for controlling the formation of DBPs contaminated by SMPs in the production and transportation of drinking water.

关 键 词：溶解性微生物产物 胞嘧啶 氯化 消毒副产物 毒性评估 饮用水安全 

分 类 号：TU991.2[建筑科学—市政工程]