title: Comparative analysis of odorous volatile organic compounds between direct injection and solid-phase microextraction: development and validation of a gas chromatography-mass spectrometry-based methodology.
abstract: In this study, the feasibility of GC-MS was evaluated for the quantification of odorous volatile organic compounds (VOCs) in environmental samples. These included methyl ethyl ketone, isobutyl alcohol, methyl isobutyl ketone, and butyl acetate plus benzene, toluene, and xylene (BTX). For this purpose, the gaseous standard for these VOCs were analyzed by GC-MS with the aid of both direct injection (DI) into the GC injector and solid-phase microextraction (SPME). The liquid phase standard prepared independently was tested additionally by the DI method as a reference to gaseous calibration. The detection limit (DL) values, when tested for basic quality assurance in this study, showed large differences between DI (0.002-0.007 ng) and SPME method (1.03-1.81 ng) in terms of absolute mass. The DL values, when expressed in terms of concentration (v/v), showed considerable improvement in SPME (below 0.40 nmol mol(-1)) relative to the DI method (approximately 6-15 nmol mol(-1)). The reliability of the GC-MS method was further validated through an analysis of real environmental samples collected from an industrial area.
authors.affiliation: Atmospheric Environment Laboratory, Department of Earth and Environmental Sciences, Sejong University, 98 Goon Ja Dong, Gwang Jin Goo, Seoul 143-747, South Korea.
authors.forename: Sudhir Kumar
authors.initials: SK
authors.lastname: Pandey
authors.forename: Ki-Hyun
authors.initials: KH
authors.lastname: Kim
mesh_terms: D000388:Air / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis; D002138:Calibration; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D016014:Linear Models; D009812:Odorants / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052617:Solid Phase Microextraction / Q000379:methods*; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D055549:Volatile Organic Compounds