中文摘要：

离子淌度谱是一种快速检测痕量挥发性有机物的高灵敏方法。在放电离子源离子淌度谱装置上，研究了八种酮类有机物的离子淌度谱。实验测量了各种离子的约化迁移率，其中丙酮、正丁酮、1-甲基-2-吡咯烷酮、环己酮、苯乙酮的实验结果与前人^63Ni放射源离子淌度谱相一致，而甲基异丙基酮、4-甲基-2-戊酮、环戊酮单体和二聚体离子的约化迁移率则是首次报道。实验测量的约化迁移率与离子质量线性相关，获得的对酮类有机物检测灵敏度在ng·L^-1量级。

英文摘要：

Ion mobility spectrometry （IMS） is a sensitive technique for fast on-line monitoring trace volatile organic compounds based upon the mobilities of gas phase ions at ambient pressure in weak electrc field. In the present work, protonated water reactant ions were successfully prepared, and eight ketones were studied on a homemade high-resolution IMS apparatus using a discharge ionization source. The reduced mobility values of all ions were derived from the observed ion mobility spectra. The experimentally determined reduced mobilities for acetone, 2-butone, 1-methyl-2-pyrrolidinone acetophenone, cyclohexanone and product ions were compared with the previously reported values in the Ni-IMS, indicating that they are in good agreement. The reduced mobilities of methyl isopropyl ketone, 4-methyl-2-pentanone and cyclopentanone ions were given for the first time. The ionization process for organic compounds in the authors＇ discharge ion mobility spectrometer is suggested to be similar to Ni-IMS system, i.e. the proton transfer reactions produce protonated ketone ions. In addition, a linear correlation was found between the reduced mobilities of the ketone ions and their molecular masses. Qualitative measurements show that the limit of detection is in the ng·L^-1 order of magnitude in the authors＇ discharge ion mobility spectrometer.