Rapid determination of ETS markers with a prototype field-portable GC employing a microsensor array detector.
Zhong-Q; Veeneman-RA; Steinecker-WH; Jia-C; Batterman-SA; Zellers-ET
J Environ Monit 2007 May; 9(5):440-448
The adaptation of a portable gas chromatograph (GC) prototype with several unique design features to the determination of vapor-phase markers of environmental tobacco smoke (ETS) is described. This instrument employs a dual-stage adsorbent preconcentrator, two series-coupled separation columns that can be independently temperature programmed, and a detector consisting of an array of nanoparticle-coated chemiresistors, whose response patterns are used together with retention times for vapor recognition. An adsorbent pre-trap was developed to remove semi-volatile organics from the sample stream. Conditions were established to quantitatively capture two ETS markers, 2,5-dimethylfuran (2,5-DMF) and 4-ethenylpyridine (4-EP, as a surrogate for 3-EP), and to separate them from the 34 most prominent co-contaminants present in ETS using ambient air as the carrier gas. A complete analysis can be performed every 15 min. Projected detection limits are 0.58 and 0.08 ppb for 2,5-DMF and 4-EP, respectively, assuming a 1 L sample volume, which are sufficiently low to determine these markers in typical smoking-permitted environments.
Analytical-chemistry; Analytical-methods; Analytical-processes; Gas-liquid-chromatography; Mass-spectrometry; Air-flow; Air-purification; Air-quality; Air-samplers; Air-sampling-techniques; Volatiles; Organic-compounds; Quantitative-analysis; Smoke-control; Smoking; Nanotechnology
Department of Environmental Health Sciences, University of Michigan, 109 S. Observatory, Ann Arbor, MI 48109-2029
Journal of Environmental Monitoring
University of Michigan, Ann Arbor