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VALIDATION STUDIES OF THERMAL EXTRACTION-GC/MS APPLIED TO SOURCE EMISSIONS AEROSOLS: 1. SEMIVOLATILE ANALYTE--NONVOLATILE MATRIX INTERACTIONS
Citation:
LAVRICH, R. AND M. D. HAYS. VALIDATION STUDIES OF THERMAL EXTRACTION-GC/MS APPLIED TO SOURCE EMISSIONS AEROSOLS: 1. SEMIVOLATILE ANALYTE--NONVOLATILE MATRIX INTERACTIONS. Analytical Chemistry. American Chemical Society, Washington, DC, 79(10):3635-3645, (2007).
Impact/Purpose:
journal article
Description:
This work develops a novel validation approach for studying how non-volatile aerosol matrices of considerably different chemical composition potentially affect the thermal extraction (TE)/GC/MS quantification of a wide range of trace semivolatile organic markers. The non-volatile matrices of a set of source emissions aerosols are first operationally isolated by thermally clearing the aerosols of their native semivolatile organic matter. TE/GC/MS analysis is then performed in triplicate on matrices refortified with multi-level organic compound standard suites. The spiking of empty thermal extraction tubes and blank quartz filters is introduced as experimental control and also allows the calculation of method detection limits. For a diesel engine exhaust sample, significant matrix effects for the six- and seven-ring polycyclic aromatic hydrocarbons (PALH) are observed and ascribed to the high proportion of elemental carbon in the sample. Our results suggest that TE/GC/MS may underestimate inhalation exposures to PAH (with five rings or more) in atmospheric aerosols replete with diesel engine exhaust (near roadways or in polluted urban air).
URLs/Downloads:
NRMRL RTP P 941 BODY.PDF (PDF, NA pp, 268 KB, about PDF)NRMRL RTP P 941 TABLIES.PDF (PDF, NA pp, 111 KB, about PDF)