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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.