Ion Mobility Spectrometry for the Isomeric Volatile Organic Compounds
HAN Hai-yan, JIA Xian-de, HUANG Guo-dong, WANG Hong-mei, LI Jian-quan, JIN Shun-ping, JIANG Hai-he, CHU Yan-nan*, ZHOU Shi-kang
Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics,Key Laboratory of Environmental Optics and Technology, Chinese Academy of Sciences, Hefei 230031,China
Abstract：Ion mobility spectrometry (IMS) is based on determining the drift velocities, which the ionized sample molecules attain in the weak electric field of a drift tube at atmospheric pressure. The drift behavior can be affected by structural differences of the analytes, so that ion mobility spectrometry has the ability to separated isomeric compounds. In the present article, an introduction to IMS is given, followed by a description of the instrument used for the experiments to differentiate isomeric compounds. Positive ion mobility spectras of three kinds of isomeric volatile organic compounds were studied in a homemade high-resolution IMS apparatus with a discharge ionization source. The study includes the differences in the structure of carbon chain, the style of function group, and the position of function group. The reduced mobility values were determined, which are in very good agreement with the previously reported theoretical values using neural network theory. The influence of the structural features of the substances and including the size and shape of the molecule has been investigated. The reduced mobility values increases in the order: alcohols-1.
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