Journal
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
Volume 20, Issue 13, Pages 2000-2008Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/rcm.2551
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A coaxially heated membrane introduction mass spectrometry (MIMS) sampling interface is presented that demonstrates improved on-line performance for the direct measurement of semi-volatile organic compounds (SVOCs) in air and water samples at parts-per-trillion levels. The device is based on a polydimethylsiloxane (PDMS) capillary hollow fibre membrane (HIM) in a pneumatically assisted 'flow-over' configuration that is resistively heated on the membrane interior via a coaxial nichrome wire, establishing a thermal gradient counter to the analyte concentration gradient. This arrangement allows for continuous and/or pulsed heating modes, affording excellent sensitivity for the on-line measurement of SVOCs while retaining sensitivity for volatile organic compounds (VOCs). In addition, the signal response time for SVOCs is reduced substantially over conventional 'flow-over' MIMS interfaces. Separation and quantitation of analytes are achieved using quadrupole ion trap tandem mass spectrometry. Copyright (c) 2006 John Wiley & Sons, Ltd.
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