固相微萃取—气相色谱分析饮用水中三卤甲烷  

Determination of trihalomethanes in drinking water using SPME coupled with gas chromatography

作　　者：沈丽娜[1] 赵贤广[1] 朱明新[1] 徐炎华[1] 

机构地区：[1]南京工业大学环境学院,江苏南京210009

出　　处：《环境污染与防治》2010年第4期67-71,共5页Environmental Pollution & Control

基　　金：国家科技重大资助专项(No.2008ZX07421-002);江苏省省级环保科技项目(No.2007021)

摘　　要：大多数自来水厂现仍使用液氯处理作为饮用水消毒的主要技术之一,但在处理过程中会产生有致癌性的三卤甲烷,如氯仿、二氯一溴甲烷、一氯二溴甲烷和溴仿。为了对饮用水中的三卤甲烷进行研究,采用固相微萃取—气相色谱方法检测分析。研究了搅拌速度、萃取时间、萃取温度、盐含量(NaCl质量分数)和pH对萃取效果的影响,得出最佳优化条件:搅拌速度240r/min,萃取时间15min,萃取温度20℃,NaCl质量分数为20%～30%,pH=6。同时,对分析参数如线性相关性、相对标准偏差、最低检出限及保留时间进行了评价。结果表明,采用固相微萃取—气相色谱方法,拟合曲线得出,在三卤甲烷质量浓度为0.05～2.00、2.00～40.00μg/L时相关系数分别为0.9908～0.9997、0.9907～0.9971;在三卤甲烷质量浓度为5.00、20.00μg/L时,相对标准偏差分别为3.5%～7.6%、1.9%～7.3%,最低检出限为0.005～0.010μg/L;经固相微萃取后,三卤甲烷在气相色谱中的保留时间最短,在6min内。Trihalomethanes （THMs） as disinfection byproducts was widely existed in drinking water treatment plants. A method for the determination of THMs in drinking water using solid-phase microextraction （SPME） coupled with gas chromatography was developed. The effects of experimental parameters such as stirring speed, extraction time,extraction temperature,ionic strength and pH on the extraction efficiency were investigated. The optimum extraction conditions were stirring speed of 240 r/min, extraction time of 15 min, NaCl ionic strength of 20 %-30% and pH of 6. The results showed that given method was superior to other determination method in THMs determination with the liner range was between 0.05 to 2.00,2.00 to 40.00 μg/L, the relative standard deviation ranged from 1.9% to 7.6% ,and the detection limits of 0. 005-0. 010 μg/L. ,

关 键 词：三卤甲烷 固相微萃取 气相色谱 饮用水 

分 类 号：R123.1[医药卫生—环境卫生学]