title: Programmed temperature vaporizer based method for the sensitive determination of trihalomethanes and benzene, toluene, ethylbenzene and xylenes in soils.
abstract: 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) 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 4.60 min, affording a very short total analysis cycle time of 9 min.
authors: Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Ciencias Químicas, Universidad de Salamanca, 37008 Salamanca, Spain. jlpp@usal.es
authors: José Luis Pérez
authors: JL
authors: Pavón
authors: Sara Herrero
authors: SH
authors: Martín
authors: Carmelo García
authors: CG
authors: Pinto
authors: Bernardo Moreno
authors: BM
authors: Cordero
mesh_terms: D001554:Benzene / Q000032:analysis*; D001555:Benzene Derivatives / Q000032:analysis*; D004867:Equipment Design; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D012680:Sensitivity and Specificity; D012965:Sodium Chloride / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D013696:Temperature; D013997:Time Factors; D022882:Trihalomethanes / Q000032:analysis*; D055549:Volatile Organic Compounds / Q000032:analysis; D014867:Water / Q000737:chemistry
chemical_list: D001555:Benzene Derivatives; D012989:Soil Pollutants; D022882:Trihalomethanes; D055549:Volatile Organic Compounds; D014867:Water; D012965:Sodium Chloride; D001554:Benzene