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J Am Soc Mass Spectrom

Title:		Utilization of a multimembrane inlet and a cyclic sudden sampling introduction mode in membrane inlet mass spectrometry
Author(s):		Viktorova OS; Kogan VT; Manninen SA; Kotiaho T; Ketola RA; Dubenskii BM; Parinov SP; Smirnov OV;
Address:		"Plasma Division, Nuclear and Space Physics Laboratory, A. F. Ioffe Physico-Technical Institute, St. Petersburg, Russia"
Journal Title:		J Am Soc Mass Spectrom
Year:		2004
Volume:		15
Issue:		6
Page Number:		823 - 831
DOI:		10.1016/j.jasms.2004.02.002
ISSN/ISBN:		1044-0305 (Print) 1044-0305 (Linking)
Abstract:		"Sudden sampling introduction into a membrane inlet mass spectrometer (MIMS) considerably improves the selectivity of the membrane inlet and is therefore applicable even for compounds with low permeabilities through a silicone membrane. In this study the basics of cyclic non-steady-state sudden increase sample injection were studied using a three-membrane inlet and a portable sector double-focusing mass spectrometer. The operational parameters of the inlet system providing the most efficient enrichment of volatile organic compounds (VOCs) in air were defined. Simulation of the diffusion process following sudden sample introduction into the three-membrane inlet was also carried out. Experimental testing of the three-membrane inlet system with the cyclic sudden sample injection mode for benzene, toluene, styrene, and xylene in air was performed. The simulation and the experimental results demonstrated that, when this mode is used, the VOCs/nitrogen relative enrichment factor of samples introduced into the mass spectrometer equipped with a three-membrane inlet is increased by a factor of approximately 10(5) compared with a direct introduction method. This effect may be used to decrease detection limits of compounds obtained with mass spectrometry to decrease matrix flow through the inlet at the same detection limits"
Keywords:
Notes:		"PubMed-not-MEDLINEViktorova, O S Kogan, V T Manninen, S A Kotiaho, T Ketola, R A Dubenskii, B M Parinov, S P Smirnov, O V eng 2004/05/18 J Am Soc Mass Spectrom. 2004 Jun; 15(6):823-31. doi: 10.1016/j.jasms.2004.02.002"