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Programmed temperature vaporizer based method for the sensitive determination of trihalomethanes and benzene, toluene, ethylbenzene and xylenes in soils

Perez Pavón, José Luis, Herrero Martín, Sara, Garcia Pinto, Carmelo, Moreno Cordero, Bernardo
Journal of chromatography 2009 v.1216 no.32 pp. 6063-6070
soil pollution, pollutants, organic halogen compounds, BTEX (benzene, toluene, ethylbenzene, xylene), benzene, toluene, xylene, equipment, vapors, headspace analysis, gas chromatography, mass spectrometry
A methodology based on the coupling of a headspace autosampler with a GC and a MS detector operating in SIM mode has been developed for the determination of volatile organic compounds (THMs and BTEX) in soils. The GC device used is equipped with a programmable temperature vaporizer (PTV) packed with Tenax-TA® to introduce the samples (the injection mode used was solvent vent), and a modular accelerated column heater (MACH[trade mark sign]) to control column temperature. The proposed measurement procedure reduces the sample pretreatment step to a minimum. Combined use of solvent vent injection mode and mass spectrometry detection allows a highly sensitive method to be proposed, with limits of detection of the order of ng/kg for all the target compounds. Furthermore, the capillary column used allows rapid separations of compounds in less than 4.60min, affording a very short total analysis cycle time of 9min.