电冷阱富集-光电离移动质谱快速检测痕量挥发性有机物  

Rapid Detection of Trace Volatile Organic Compounds By Electric Driven Cryo-Trap Movable Mass Spectrometer

作　　者：韩笑笑 李金旭[2] 蒋吉春 吴称心 陈平[2] 张智平[1] 侯可勇[2] 李海洋[2] HAN Xiao-Xiao;LI Jin-Xu;JIANG Ji-Chun;WU Chen-Xin;CHEN Ping;ZHANG Zhi-Ping;HOU Ke-Yong;LI Hai-Yang(The College of Chemistry&Chemical Engineering of Xi'an Shiyou University,Xi'an 710065,China;Key Laboratory of Separation Science for Analytical Chemistry of Chinese Academy of Sciences,Dalian Institute of Chemical Physics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China)

机构地区：[1]西安石油大学化学化工学院,西安710065 [2]中国科学院分离分析化学重点实验室,中国科学院大连化学物理研究所,大连116023

出　　处：《分析化学》2018年第5期642-649,共8页Chinese Journal of Analytical Chemistry

基　　金：本文系国家自然科学基金项目(Nos.21375129,21675155)及国家高技术研究发展计划(863)项目(2014AA06A507)资助

摘　　要：采用电动制冷机设计并搭建了一套低温富集-高温解析冷阱装置,与光电离移动质谱联用,实现了大气中痕量挥发性有机物(VOCs)快速、自动富集检测。与传统冷阱制冷方式相比,电动制冷机低温可至!196℃,体积小巧、无制冷剂消耗、便于携带。利用冷阱结合在线质谱分析了苯、甲苯和二甲苯混合气,对冷阱各参数进行了优化,结果表明:冷阱富集后苯、甲苯和二甲苯的信号强度分别提高了212、254和242倍,回收率分别达到98%、87%和85%,单样品分析时间14 min。将电冷阱结合移动式在线质谱直接分析含有39种VOCs的EPA TO-14标准混合气和室内环境空气,仪器灵敏度低于国家对室内空气中VOCs阈值。电冷阱富集在线移动式质谱可以实现大气、室内环境中痕量VOCs快速富集检测,在挥发性有机污染物现场、实时监测中具有重要的应用潜力。An electric driven cryo-trap enrichment apparatus for the movable mass spectrometer was designed to realize rapid and automatic detection of trace volatile organic compounds(VOCs)in the atmosphere.Compared with traditional cryo-trap with refrigerant,the lowest temperature of cryocooler was down to-196益,and it was easy to carry due to its small size,light weight and refrigerant-free.Cryo-trap combined with time-of-flight mass spectrometer was used to analyze benzene,toluene and xylene,and the result showed that the signal strength of benzene,toluene and xylene,with the cryo-trap enrichment,was improved by 212-fold,254-fold and 242-fold,and the recoveries reached 98%,87%and 87%,respectively.The analytical time for single sample was only 14 min.The electric driven cryo-trap combined with on-line mass spectrometer was used to detect 39 kinds of VOCs listed in TO-14 method of EPA and ambient air,and the sensitivity of the newly designed instrument was better than the threshold of national indoor VOCs.The combination of electric driven cryo-trap and time-of-flight mass spectrometer could be used for rapid enrichment and monitoring of trace VOCs in the atmosphere and indoor air,showing great potential in in-site measurement and real-time monitoring of volatile organic pollutants.

关 键 词：挥发性有机物 电冷阱富集 移动式质谱 痕量检测 

分 类 号：O657.63[理学—分析化学] X831[理学—化学]