« Previous AbstractDetermination of alcohol compounds using corona discharge ion mobility spectrometry    Next AbstractEvaluating Indoor Air Phthalates and Volatile Organic Compounds in Nail Salons in the Greater New York City Area: A Pilot Study »

Guang Pu Xue Yu Guang Pu Fen Xi

Title:		[Ion mobility spectrometry for the isomeric volatile organic compounds]
Author(s):		Han HY; Jia XD; Huang GD; Wang HM; Li JQ; Jin SP; Jiang HH; Chu YN; Zhou SK;
Address:		"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"
Journal Title:		Guang Pu Xue Yu Guang Pu Fen Xi
Year:		2007
Volume:		27
Issue:		10
Page Number:		1925 - 1928
DOI:
ISSN/ISBN:		1000-0593 (Print) 1000-0593 (Linking)
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 < 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 x L(-1)"
Keywords:
Notes:		"PubMed-not-MEDLINEHan, 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 chi English Abstract China 2008/03/01 Guang Pu Xue Yu Guang Pu Fen Xi. 2007 Oct; 27(10):1925-8"