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A universal temperature controlled membrane interface for the analysis of volatile and semi-volatile organic
Colin S Creaser1, David Gómez Lamarca, Luisa M Freitas dos Santos
1School of Science, Nottingham Trent University, Clifton Lane, Nottingham, UK NG11 8NS. colin.creaser@ntu.ac.uk
Abstract:
A universal temperature controlled membrane interface (TCMI) has been constructed for hollow-fibre membranes. The membrane temperature is controllable in the range -70 to 250 degrees C using an electric heater and a flow of cooled nitrogen or helium gas. Volatile and semi-volatile organic compounds may be detected either by continuous diffusion across the membrane or by in-membrane pre-concentration followed by thermal desorption into the detector. The TCMI interface is demonstrated in combination with mass spectrometry and GC-MS, for the determination of VOCs and SVOCs in aqueous and air samples and for the on-line monitoring of a bioreactor.