[Discharge ion mobility spectrometry of ketonic organic compounds].
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 electric 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 x L(-1) order of magnitude in the authors' discharge ion mobility spectrometer.
Huang
Guo-dong
GD
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.
Han
Hai-yan
HY
Jia
Xian-de
XD
Jin
Shun-ping
SP
Li
Jian-quan
JQ
Wang
Hong-mei
HM
Tang
Xiao-shuan
XS
Jiang
Hai-he
HH
Chu
Yan-nan
YN
Zhou
Shi-kang
SK
D007477:Ions / Q000737:chemistry; D007659:Ketones / Q000032:analysis* / Q000737:chemistry; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*
D007477:Ions; D007659:Ketones