固相微萃取与气相色谱-质谱联用测定饮用水中甲基叔丁基醚

Determination of Methyl Tert-Butyl Ether by Solid Phase Microextraction Coupled with GC-MS

采用固相微萃取与气相色谱-质谱联用测定饮用水中甲基叔丁基醚（MTBE），研究了萃取头涂层材料、萃取温度、盐浓度、萃取时间和溶液的pH值等操作条件对分析方法的影响。该方法分析MTBE的线性范围0．01～10μg／L。检出限0．66ng/L。0．01μg／L的MTBE水样五组平行测定实验中，相对标准偏差为4．8％。用所建立的方法测得大兴某地下水中MTBE的含量0．8μg／L，加标回收率达到90％。

A sensitive method was developed by solid phase microextraction （SPME） followed by GC-MS for fast determination of methyl tea-butyl ether （MTBE） in drinking water. The effects of fiber coating, extraction temperature, salt concentration, extraction time and pH on extraction efficiency were investigated. The fiber coated with DVB/CAR/PDMS has the highest extraction efficiency. The calibration linear range for MTBE is 0.01 - 10μg/L and the limit of detection is 0.66ng/L. The relative standard deviation, for five replicates of 0.01μg/L MTBE in water is 4.8 % . The method was applied to determine MTBE in the groundwater and the spiked recovery reaches 90 %.