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Characterization of a high-performance portable GC with a chemiresistor array detector.

Authors
Zhong-Q; Steinecker-WH; Zellers-ET
Source
Analyst 2009 Feb; 134(2):283-293
NIOSHTIC No.
20034958
Abstract
The laboratory characterization of a novel, second-generation portable gas chromatograph (GC) prototype designed for trace-level determinations of complex mixtures of volatile organic compounds (VOC) is described. The instrument incorporates a small, multi-stage adsorbent preconcentrator/injector (PCI), two series-coupled separation columns with fast, independent temperature-programming capabilities and junction-point pressure/flow control, and a detector consisting of an array of microfabricated chemiresistor (CR) sensors coated with thiolate-monolayer-protected gold nanoparticle films. Response patterns from the CR array are used in conjunction with chromatographic retention times to identify eluting mixture components. Scrubbed ambient air is used as the carrier gas. Enhancements in design relative to a previously reported first-generation prototype instrument have led to significant reductions in limits of detection as well as improvements in resolution, reliability, flexibility, and convenience. Key features of the instrument are characterized, with an emphasis on the tradeoffs in sensor array performance associated with operation at different temperatures and flow rates. The separation of a preconcentrated mixture of 31 VOCs in < 7 minutes is demonstrated. Projected detection limits are in the ppt range for most compounds, assuming a 1 L sample volume.
Keywords
Gas-chromatography; Vapors; Air-quality; Air-quality-monitoring; Air-quality-measurement; Gases; Organic-chemicals; Air-quality-control; Organic-compounds; Organic-vapors; Equipment-design; Equipment-reliability; Particle-counters; Gas-chromatography; Gas-liquid-chromatography; Nanotechnology
Contact
Department of Environmental Health Sciences, University of Michigan, 109 S. Observatory, Ann Arbor, MI 48109-2029
CODEN
ANALAO
Publication Date
20090201
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003692
Issue of Publication
2
ISSN
0003-2654
Source Name
Analyst
State
MI
Performing Organization
University of Michigan, Ann Arbor
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