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| Titel |
A versatile and reproducible automatic injection system for liquid standard introduction: application to in-situ calibration |
| VerfasserIn |
G. Isaacman, N. M. Kreisberg, D. R. Worton, S. V. Hering, A. H. Goldstein |
| 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 ; 4, no. 9 ; Nr. 4, no. 9 (2011-09-19), S.1937-1942 |
| Datensatznummer |
250002099
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| Publikation (Nr.) |
 copernicus.org/amt-4-1937-2011.pdf |
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| Zusammenfassung |
| The quantitation of trace organic compounds in ambient organic aerosol is
difficult due to the chemical complexity of these mixtures, but is needed to
provide insight into their sources and formation processes. Compound-level
characterization of organic aerosols is typically performed through sample
collection followed by gas or liquid chromatography. With these methods,
introduction of liquid standards has long been used as an effective means of
quantifying trace compounds, but automating this technique for use with
in-situ instrumentation has not previously been achieved. Here we develop an
automatic injection system (AutoInject) for the introduction of liquids into
a custom collection and analysis cell for improved quantitation in
chromatographic measurements. The system consists of chilled reservoirs
containing liquid standards from which a sample loop is loaded and then
injected into the cell. The AutoInject is shown to be reproducible over 106
injections with a relative standard deviation of 1.5%, and have
negligible injection-to-injection carryover. A 6-port selector allows
injection of different liquid standards separately or simultaneously.
Additionally, automatic injection of multiple sample loops is shown to
generate a linear multi-point calibration curve. Tests conducted in this
work focus on use with the Thermal desorption
Aerosol Gas chromatograph (TAG), but the flexibility of the
system allows it to be used for a variety of applications. |
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