单光子/光电子电离-膜进样质谱法在线检测水中醚类汽油添加剂  

Single Photon Ionization/Photoelectron Ionization-Membrane Introduction Mass Spectrometry for On-line Analysis Ethers Gasoline Additive in Water

作　　者：李芳龙[1] 侯可勇[2] 陈文东[2,3] 陈平[2,3] 赵无垛[2,3] 崔华鹏[2,3] 花磊[2] 谢园园[2,3] 裴克梅[1] 李海洋[2] 

机构地区：[1]浙江理工大学化学系,杭州310018 [2]中国科学院大连化学物理研究所,大连116023 [3]中国科学院研究生院,北京100039

出　　处：《分析化学》2013年第1期42-48,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.20907052)资助项目

摘　　要：采用膜进样-光电子磁场增强电离(MEPEI)/单光子电离(SPI)复合电离源飞行时间质谱(TOF-MS)在线分析水中醚类汽油添加剂:甲基叔丁基醚(MTBE)、乙基叔丁基醚(ETBE)、甲基叔戊基醚(TAME)和二异丙基醚(DIPE)。膜进样方式无需样品前处理,通过渗透蒸发实现液体样品在线富集;SPI电离碎片离子少,谱图简单,可利用分子离子进行快速的半定性分析;MEPEI产生样品分子碎片可精确定性同分异构体,从而克服直接进样时复杂基质中重叠峰解析的难题。在最优实验条件下:膜温度为60℃,膜厚度为50μm,膜面积为160 mm2,单个样品分析时间小于100 s。MTBE,ETBE,TAME和DIPE的检出限分别达到5.5,4.8,3.3和4.3μg/L。本方法成功应用于模拟地下水中MTBE类汽油添加剂的快速检测。A magnetic field enhanced photoelectron ionization （MEPEI） source combined with single photon ionization （SPI） for membrane inlet time-of-flight mass spectrometry was used for on-line detection of ether gasoline additive. Methyl tert-butyl ether （MTBE）, ethyl tert-butyl ether （ETBE）, methyl tert-amyl ether （TAME） and isopropyl ether （DIPE） were selected as the typical pollutants. A membrane inlet was used to transfer the analytes from liquid into gas phase in an on-line manner by pervaporization without sample pretreatment. Less sample fragments were in SPI, and molecular ions could be used to quick preliminarily qualitative analysis; high energy electrons and fragmentations produced by MEPEI can be used to accurate qualitative isomers and overcame the problem of resolution of overlapping peaks in complex matrix when using direct injection. Under the optimal conditions such as membrane temperature 60 ~C, membrane thicknesses 50μm and membrane areas 160 μm2, the single sample analysis time was less than 100 s, and the limits of detection for MTBE, ETBE, TAME and DIPE were 5.5, 4.8, 3.3 and 4.3 μg/L, respectively. The instrument has been successfully applied to rapid analysis of MTBE in simulated water by gasoline.

关 键 词：膜进样 单光子电离 飞行时间质谱 甲基叔丁基醚 在线检测 

分 类 号：X832[环境科学与工程—环境工程] O657.63[理学—分析化学]