LI Zhuang1, 2，LIN Bing-tao1, 2，KONG De-yi1*，CHEN Chi-lai1，CHENG Yu-peng1，2，WANG Huan-qin1，MEI Tao1
1. Institute of Intelligent Machines, Chinese Academy of Sciences, State Key Laboratory of Transducer Technology, Hefei 230031，China 2. Department of Automation, University of Science and Technology of China, Hefei 230027，China
摘要： 高场不对称波形离子迁移谱(high-field asymmetric waveform ion mobility spectrometry，FAIMS)技术是一种快速、高灵敏的痕量物质检测技术。利用自制的高场不对称波形离子迁移谱仪分别对丙酮、苯和甲苯样品进行了检测，结果表明三种挥发性物质在谱图中的分离效果优于传统离子迁移谱仪;另外分别对二甲苯三种同分异构体进行了检测，成功地实现了三者的分离。实验分析了载气流速对离子信号强度的影响，发现流速为220 L·h-1时信号强度最大，此结果可用于仪器的优化设计。获得丙酮的检出限为100 ng·L-1，比国外传统离子迁移谱仪低了一个数量级。
关键词：高场不对称波形离子迁移谱;痕量挥发性有机物
Abstract：FAIMS is a fast and high sensitive technique for detecting trace volatile organic compounds. Spectra of acetone, benzene and toluene were obtained on a homemade high-field asymmetric waveform ion mobility spectrometer and they can be easily separated in the spectra. Three xylene isomeric compounds were also successfully separated in FAIMS. Effect of carrier gas flow rate on the ion intensity was analyzed, and the optimal flow rate of carrier gas was 220 L·h-1 which can be used for the optimization of FAIMS instrument. The detection limit for acetone is 100 ng·L-1 that is an order of magnitude lower than the foreign traditional IMS.
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