氯消毒中有机防晒剂BP9的去除转化与风险评价

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摘要对典型有机防晒剂二苯甲酮-9（BP9）在氯消毒过程中的氧化反应进行研究，考察BP9初始浓度、余氯初始浓度、溶液pH值和氨氮浓度对反应的影响，探究BP9氯氧化降解机理，评估其生态风险.结果表明，在BP9初始浓度5mg/L、余氯初始浓度5mg/L的条件下，90s内BP9去除率达到91.3%，符合准一级反应动力学.降解速率常数随着BP9初始浓度及氨氮浓度增加而减小，随余氯初始浓度增大而增大，中性条件下有利于BP9氯氧化反应.基于HPLC-MS/MS和GC-MS解析出7种中间产物，提出可能降解路径.发光细菌毒性分析和ECOSAR预测均表明，BP9氯氧化反应生成了比母物质毒性更高的中间产物，对饮用水水质安全造成潜在风险.

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	李佳琦
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	樊鑫鑫
	杨韵一
	王利平

关键词 ：二苯甲酮-9(BP9), 氯氧化, 影响因素, 降解机理, 风险评价

Abstract：The issue of new disinfection by-products in drinking water is attracting increasing concern.Chlorination of a typical UV-filter benzophenone-9(BP9) was studied.The effect of initial BP9 concentration,initial residual chlorine,pH value,and ammonia nitrogen concentration on the reaction were also investigated.The degradation mechanism and the ecological risk were further discussed.The results indicated that,BP9 removal could reach 91.3% in 90s under the conditions of initial BP9 concentration 5mg/L,initial residual chlorine 5mg/L.BP9 chlorination process obeyed the pseudo-first-order kinetics.The degradation rate decreased with the increase of initial BP9 concentration and ammonia nitrogen concentration,while increased with the increase of initial residual chlorine.Neutral conditions are favorable for BP9 chlorination.Seven intermediates were identified by HPLC-MS/MS and GC-MS,and possible degradation pathways were also proposed.Luminescent bacteria experiment and ECOSAR prediction both showed that intermediates produced in BP9 chlorination have higher toxicity than the parent compound,which pose a potential risk to drinking water safety.

Key words： benzophenone-9(BP9) chlorination influencing factors degradation mechanism risk assessment

收稿日期: 2017-08-15

X703.1

基金资助:国家水体污染控制与治理科技重大专项（2012ZX07301-001）；江苏省产学研前瞻性联合研究项目（BY2016029-09）；国家环境保护土壤环境管理与污染控制重点实验室开放基金资助项目（NJ2015029）

通讯作者: 杜尔登,副教授,duerdeng@cczu.edu.cn E-mail: duerdeng@cczu.edu.cn

作者简介: 李佳琦(1993-),女,山西太原人,硕士研究生,主要从事饮用水水质安全保障技术研究.发表论文2篇.

引用本文:

李佳琦, 杜尔登, 樊鑫鑫, 杨韵一, 王利平. 氯消毒中有机防晒剂BP9的去除转化与风险评价[J]. 中国环境科学, 2018, 38(3): 968-976. LI Jia-qi, DU Er-deng, FAN Xin-xin, YANG Yun-yi, WANG Li-ping. Removal, transformation and risk assessment of UV-filter BP9 during chlorination disinfection. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 968-976.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2018/V38/I3/968

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