4-羟基二苯甲酮氯化转化机制及毒性评价
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- 英文论文题名：Transformation mechanisms and acute toxicity variation of 4-hydroxyl benzophenone in chlorination disinfection process
- 论文作者：魏东斌 ; 刘奇 ; 杜宇国
- 英文论文作者：Dongbin Wei ; Qi Liu ; Yuguo Du ; Research Center for Eco-Environmental Sciences ; CAS
- 年：2016
- 作者机构：中国科学院生态环境研究中心;
- 论文关键词：二苯甲酮 ; 氯化消毒 ; 毒性 ; 转化机理
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：X52;R123.6
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：210k
- 原文格式：D
- 会议级别：全国
摘要
二苯甲酮类化合物是一类广泛使用的紫外防晒剂,近年在环境介质和生物体中频繁检出。环境中残留的该类化合物可能对生态安全和人体健康造成潜在威胁。氯化消毒是水处理过程的必要环节,但消毒剂氯可能与水体中残留的化学污染物反应生成毒性副产物。本研究借助液相色谱-质谱联用技术、磁核共振技术等研究4-羟基-二苯甲酮(4HB)在氯化消毒处理中的转化特征。在4HB氯化体系中检出8种主要转化产物,其生成机理主要涉及氯化取代、酮氧化、酯水解、及苯环氧化断裂等复杂化学反应。pH条件影响转化反应的类型,氯剂量影响转化反应进行的程度。急性毒性检测结果表明,4HB经氯化处理后毒性有不同程度的升高,可能与氯代产物3,5-二氯-4HB的生成有关。特别值得关注的是,在模拟实际环境残留浓度的4HB经氯化消毒处理后也检出了高毒性产物3,5-二氯-4HB等,提示4HB氯化消毒处理的潜在风险值得关注。4HB O Cl OH O OH Cl Cl O OH P2 P5Cl Cl O OHCl P6O Cl Cl OH O P4P4’Ch P3’O C CH OOH Cl ClO C O OH OH Cl Cl Cl HO P1’P1P3Ch Ox Ox Hy Ch4HB O Cl OH O OH Cl Cl O OH P2 P5O Cl Cl OH O P4Ch pH=7.5Ch Ox Ox Ch
Benzophenones compounds(BPs) are widely used as UV filters,and have been frequently found in multiple environmental matrices.The residual of BPs in water would cause potential threats on ecological safety and human health.Chlorination disinfection is necessary in water treatment process,the transformation of 4-hydroxyl benzophenone(4HB) with free available chlorine(FAC) was investigated.Eight major products were identified,and the formation mechanisms involved chlorine substitution of 4HB,oxidation of ketones,hydrolysis of esters and oxidative breakage of benzene ring.The pH conditions determined the occurrence of reaction types,and the FAC dosages affected the extent of reactions.It was found that acute toxicity increased after chlorination of 4HB due to the formation of 3,5-dichloro-4HB.More importantly,4HB at low level in ambient water matrices could be transformed during simulated chlorination disinfection practice.Two major products 3-chloro-4HB and 3,5-dichloro-4HB were found,implying the potential ecological risk in chlorination disinfection.
Benzophenones compounds(BPs) are widely used as UV filters,and have been frequently found in multiple environmental matrices.The residual of BPs in water would cause potential threats on ecological safety and human health.Chlorination disinfection is necessary in water treatment process,the transformation of 4-hydroxyl benzophenone(4HB) with free available chlorine(FAC) was investigated.Eight major products were identified,and the formation mechanisms involved chlorine substitution of 4HB,oxidation of ketones,hydrolysis of esters and oxidative breakage of benzene ring.The pH conditions determined the occurrence of reaction types,and the FAC dosages affected the extent of reactions.It was found that acute toxicity increased after chlorination of 4HB due to the formation of 3,5-dichloro-4HB.More importantly,4HB at low level in ambient water matrices could be transformed during simulated chlorination disinfection practice.Two major products 3-chloro-4HB and 3,5-dichloro-4HB were found,implying the potential ecological risk in chlorination disinfection.
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