Meso-scale VOC-mixture analyzer with tunable separation and microsensor array detection.
Zhong-Q; Steinecker-WH; Zellers-ET
Rare Metal Mater Eng 2006; 35(Suppl 3):61-64
A novel portable instrument developed for field determinations of complex mixtures of volative organic compounds (VOCs) is described. The key features of the instrument are a miniature multi-state absorbent preconcentrator/focuser, two series-coupled separation columns with pressure and temperature tunable retention control, and an integrated array of four chemiresistor (CR) sensors coated with Au-thiolate monolayer-protected nanoparticles (MPN). MPN-CR array response patterns are used with retention times to identify eluting vapors. Air is used as the carrier gas. Calilbrations of 20 common indoor air contaminants gave T.ODs in the range of 0.05 ng/g-0.53 ng/g for a 1 L sample volume. Results of preliminary analyses of characteristic VOCs generated from U.S. currency as well as vapor-phase markers of environmental tobacco smoke (ETS) at low- or sub- ng/g levels are presented.
Volatiles; Organic-compounds; Analytical-processes; Nanotechnology; Gases; Air-contamination; Environmental-exposure; Environmental-contamination; Tobacco-smoke; Gas-chromatography; Laboratory-testing;
Author Keywords: microsensor; gas chromatography; nanoparticle; sensor array; protable; ETS;
Edward T. Zellers, Department of Environmental Health Sciences, Unversity of Michigan, 109 S. Observatory St., Ann Arbor, MI 48109-2029
Rare Metal Materials and Engineering
University of Michigan, Ann Arbor