热解析法/单光子电离质谱法对土壤中多环芳烃的检测  

Detection of Polycyclic Aromatic Hydrocarbons in Soil Sample by Thermal Desorption / Single Photon Ionization Mass Spectrometry

作　　者：李阿丹[1,2] 孙扬[1] 崔宗岩[3] 

机构地区：[1]燕山大学环境与化学工程学院,河北秦皇岛066004 [2]河北省应用化学重点实验室,河北秦皇岛066004 [3]秦皇岛出入境检验检疫局,河北秦皇岛066004

出　　处：《分析测试学报》2014年第4期465-470,共6页Journal of Instrumental Analysis

基　　金：河北省高等学校科学技术研究青年基金项目(QN20131038)

摘　　要：以电子束泵浦稀有气体准分子灯发射出的126 nm紫外光为电离源,结合飞行时间质谱在线分析了土壤中的16种多环芳烃(PAHs)。利用热解吸装置将PAHs气体直接引入质谱,建立了以毛细管直接进样法为样品导入方法的单光子电离质谱分析方法。考察了不同PAHs解吸时间及解吸温度的影响,并讨论了单光子电离效率对检出限的影响。根据标准混合气体的分析得到16种PAHs的检出限可达μg/mL级别。An electron beam pumped rare gas excimer lamp（EBEL） was utilized to emit the intensive vacuum ultraviolet （VUV） radiation at 126 nm for soft single photon ionization （SPI） of polycyclic aro- matic hydrocarbons（PAHs） in a soil sample. The VUV light source was coupled to a compact and mobile time - of - flight mass spectrometer （ TOF MS） for the on-line detection of PAHs. The PAH desorption gases from soil sample were introduced into the mass using direct sample introduction with a cappillary. The effects of moderate desorption temperatures and desorption time on 16 PAHs were dis- cussed, and the influences of the ionization efficiency of the single photon ionization on limits of de- tection were also considered. The quantitative analysis was carried out by measuring the mixture of a standard gas, and the limits for detection for 16 PAHs in the environmental soil were found to be at a μg/mL level

关 键 词：单光子电离 多环芳烃 真空紫外辐射 直接进样法 检出限 电离效率 

分 类 号：O657.63[理学—分析化学] O625.15[理学—化学]