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Portable gas chromatograph with tunable retention and sensor array detection for determination of complex vapor mixtures.

Authors
Lu-CJ; Whiting-J; Sacks-RD; Zellers-ET
Source
Anal Chem 2003 Mar; 75(6):1400-1409
NIOSHTIC No.
20029216
Abstract
A prototype portable gas chromatograph that combines a multiadsorbent preconcentrator/focuser, a tandem-column separation stage with individual column temperature control and junction point pressure modulation, and a detector consisting of an integrated array of polymer-coated surface acoustic wave microsensors is described. Using scheduled first-column stop-flow intervals and independent temperature programming of the two columns, it is possible to adjust the retention of eluting analyte vapors to maximize vapor recognition with the microsensor array and minimize the time of analysis. A retention window approach is combined with Monte Carlo simulations to guide retention tuning requirements and facilitate pattern recognition analyses. The determination of a 30-vapor mixture of common indoor air contaminants in < 10 min is demonstrated using ambient air as the carrier gas. Detection limits of < 10 ppb are achieved for the majority of compounds from a 1-L air sample on the basis of the most sensitive sensor in the array. Performance is assessed in the context of near-real-time indoor air quality monitoring applications.
Keywords
Gas-chromatography; Vapors; Air-quality; Air-quality-monitoring; Air-quality-measurement; Gases; Organic-chemicals; Air-quality-control
CODEN
ANCHAM
Publication Date
20030315
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2003
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003692
Issue of Publication
6
ISSN
0003-2700
Source Name
Analytical Chemistry
State
MI
Performing Organization
University of Michigan, Ann Arbor
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