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| Titel |
Development of an automated high-temperature valveless injection system for online gas chromatography |
| VerfasserIn |
N. M. Kreisberg, D. R. Worton, Y. Zhao, G. Isaacman, A. H. Goldstein, S. V. Hering |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 12 ; Nr. 7, no. 12 (2014-12-12), S.4431-4444 |
| Datensatznummer |
250115994
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| Publikation (Nr.) |
 copernicus.org/amt-7-4431-2014.pdf |
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| Zusammenfassung |
| A reliable method of sample introduction is presented for online gas
chromatography with a special application to in situ field portable
atmospheric sampling instruments. A traditional multi-port valve is replaced
with a valveless sample introduction interface that offers the advantage of
long-term reliability and stable sample transfer efficiency. An engineering
design model is presented and tested that allows customizing this
pressure-switching-based device for other applications. Flow model accuracy is within
measurement accuracy (1%) when parameters are tuned for an
ambient-pressure detector and 15% accurate when applied to a vacuum-based
detector. Laboratory comparisons made between the two methods of sample
introduction using a thermal desorption aerosol gas chromatograph (TAG) show
that the new interface has approximately 3 times greater reproducibility
maintained over the equivalent of a week of continuous sampling. Field
performance results for two versions of the valveless interface used in the
in situ instrument demonstrate typically less than 2% week−1 response
trending and a zero failure rate during field deployments ranging up to 4
weeks of continuous sampling. Extension of the valveless interface to dual
collection cells is presented with less than 3% cell-to-cell carryover. |
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