« Previous AbstractA Nanostructured Microfluidic Artificial Olfaction for Organic Vapors Recognition    Next AbstractField response of Mediterranean fruit flies to ceralure B1 relative to most active isomer and commercial formulation of trimedlure »

Rapid Commun Mass Spectrom

Title:		Characterization of a mini membrane inlet mass spectrometer for on-site detection of contaminants in both aqueous and liquid organic samples
Author(s):		Janfelt C; Frandsen H; Lauritsen FR;
Address:		"Department of Chemistry, Copenhagen University, Universitetsparken 5, 2100 Copenhagen O, Denmark"
Journal Title:		Rapid Commun Mass Spectrom
Year:		2006
Volume:		20
Issue:		9
Page Number:		1441 - 1446
DOI:		10.1002/rcm.2466
ISSN/ISBN:		0951-4198 (Print) 0951-4198 (Linking)
Abstract:		"A mini membrane inlet mass spectrometer (mini-MIMS) of a total weight of 12 kg was constructed using a miniature Multipole mass spectrometer, a small vacuum system and a flexible flat sheet membrane inlet, where the exposed membrane area can be changed by a factor of 80. The variable membrane area together with the possibility of operating the Multipole at pressures up to 1 x 10(-3) Torr made it possible to test the system with three microporous membranes (cellulose, polyether sulfone and polypropylene) normally not compatible with standard electron ionization MIMS systems and a standard non-porous polydimethylsiloxane membrane. We found that the hydrophilic cellulose and polyether sulfone membranes had selectivity characteristics opposite to those of the standard silicone membrane. They demonstrated preferential detection of hydrophilic compounds in hydrophobic organic solvents, whereas the silicone membrane preferentially detects hydrophobic organic compounds in aqueous solution. Using the cellulose membrane, organic contaminants and water could be detected in organic solvents at 10-100 ppm levels by weight, the relative high detection limits primarily caused by interference from a high chemical background from the solvent. When being used with the standard silicone membrane the mini-MIMS behaved just like most standard MIMS systems with detection limits of volatile organic compounds in water at concentrations just below 1 ppm. The hydrophobic microporous polypropylene membrane was not found to be useful with the mini-MIMS"
Keywords:
Notes:		"PubMed-not-MEDLINEJanfelt, Christian Frandsen, Helle Lauritsen, Frants R eng England 2006/04/06 Rapid Commun Mass Spectrom. 2006; 20(9):1441-6. doi: 10.1002/rcm.2466"