中文摘要：

离子淌度谱利用大气压下不同离子在电场中的运动速度不同来达到分离离子的目的。离子在电场中的运动速度不仅与离子的质量有关,也与离子的结构有关,因此离子淌度谱可以有效地用来区分同分异构体。文章报道了用自行研制的放电离子源离子淌度谱仪对碳骨架异构、官能团类别异构和官能团位置异构的三类同分异构体进行了实验研究,得到了九种挥发性有机物的离子淌度谱,测量了各离子的约化迁移率,与前人使用神经网络理论得到的计算值相一致。实验表明这些同分异构体有机物能够在高分辨的离子淌度谱中实现分离,而且对本实验所研究的九种同分异构体有机物而言,迁移率大小符合规律：醇类〈酮类〈芳香类,直链〈分支〈环状,对位〈间位〈邻位。实验中使用指数稀释法对样品进行了定量分析,利用该方法得到的检测限达到ng.L-1量级。其中对官能团类别异构的同分异构体以及丁醇同分异构体的放电离子淌度谱研究均为首次报道。

英文摘要：

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 speetras of three kinds of isomeric volatile organic compounds were studied in a homemade highresolution 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〈acetones〈 aromas, linears 〈 branches〈 cycles, and para-〈meta-〈ortho-. The deviating ion mobility spectra of the constitutional isomers studied reflect the influence of structural features. In order to calibrate or determine the detection limits and the sensitivity of the ion mobility spectrometry, the exponential dilution flask （EDF） was used. Using this method, the detection limit of the analytes can reach the order of magnitude of ng·L^-1.