自动顶空固相微萃取-气相色谱质谱联用法检测水中碘代三卤甲烷  

Determination of Iodinated Trihalomethanes in Water by Using Automated Headspace Solid-Phase Microextraction/Gas Chromatography-Mass Spectrometry

作　　者：刘海樑 沈元静 LIU Hailiang;SHEN Yuanjing(Shanghai National Engineering Center of Urban Water Resources Co.,Ltd.,Shanghai200082,China;Shanghai Chengtou WaterCo.,Ltd.,Shanghai200002,China)

机构地区：[1]上海城市水资源开发利用国家工程中心有限公司,上海200082 [2]上海城投水务<集团>有限公司,上海200002

出　　处：《净水技术》2024年第8期96-103,共8页Water Purification Technology

基　　金：上海市2023年度社会发展科技攻关项目:饮用水中新污染物特征识别与去除控制关键技术研究(23DZ1203001);上海水源嗅味物质与新污染物赋存特征及控制技术研究。

摘　　要：碘代三卤甲烷(I-THMs)是一种未受控的新消毒副产物(DBPs),与其他卤代三卤甲烷比较具有低浓度、高毒性的特性。文章介绍了全自动顶空固相微萃取气相色谱联用质谱法检测饮用水和原水中6种I-THMs,萃取条件:以50/30DVB/CAR/PDMS为萃取头,萃取温度为50℃,萃取时间为25 min,振摇速度为400 r/min,解析温度为210℃,解析时间为1 min。该方法中各目标物检出限为4.2~11.0 ng/L,标准曲线为10~400 ng/L,各目标物线性相关系数均大于0.998,选择了50、100、200 ng/L 3个加标质量浓度,以纯水、出厂水和原水为本底进行了方法验证,相对标准偏差(RSD)为0.9%~7.3%,加标回收率为71%~118%,证明该固相微萃取-气相色谱质谱法能够精密准确地应用于出厂水及原水中痕量I-THMs的检测。利用该方法对上海市水厂的饮用水进行了检测,6种I-THMs除碘仿外都有检出,二氯一碘甲烷和溴氯碘甲烷的检出浓度较高。Iodinated trihalomethanes(I-THMs)is a new unregulated disinfection by-product(DBPs),which has the characteristics of low concentration and high toxicity compared with other iodinated trihalomethanes.This paper introduced the automated headspace solid phase microextraction-gas chromatography-mass spectrometry method for the detection of six iodinated trihalomethanes in drinking water and raw water.The extraction conditions were as follows:50/30 DVB/CAR/PDMS as the microextraction fiber,extraction temperature 50℃,extraction time 25 min,agitation speed 400 r/min,desorption temperature 210℃,desorption time 1 min.The detection limits of the targets were from 4.2 to 11.0 ng/L,the calibration curve range was from 10 to 400 ng/L,and the linear correlation coefficients of each target were greater than 0.998.Three spiked mass concentrations of 50,100 ng/L and 200 ng/L were selected,and the method was verified with pure water,factory water and raw water as background.The relative standard deviation(RSD)was from 0.9%to 7.3%,and the spiked recovery rate was 71%~118%.It was verified that the solid-phase microextraction-gas chromatography-mass spectrometry method could be accurately and precisely applied to the detection of trace I-THMs in drinking water and raw water.The method was used to detect drinking water from the WTPs in Shanghai.Six iodinated trihalomethanes were detected in samples except iodoform,and dichloroiodomethane and bromochloroiodomethane were detected at higher concentrations.

关 键 词：碘代三卤甲烷(I-THMs) 固相微萃取 饮用水 消毒副产物 方法验证 

分 类 号：TU991[建筑科学—市政工程]