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- W3149342137 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 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. Improvements in design relative to a previously reported first-generation prototype instrument have led to performance enhancements, which are highlighted. A focus is placed on the tradeoffs in sensor array performance associated with thermal and fluidic operating variables. The separation of a preconcentrated mixture of 31 VOCs in < 420 seconds is demonstrated. Projected detection limits are in the ppt range for most compounds, assuming a 1 L sample volume." @default.
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- W3149342137 date "2008-01-01" @default.
- W3149342137 modified "2023-09-28" @default.
- W3149342137 title "A Portable Gas Chromatograph with Tunable Separation and Microsensor Array Detection: Design, Characterization, and Environmental Health Applications" @default.
- W3149342137 hasPublicationYear "2008" @default.
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