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| Titel |
High-precision analysis of SF6 at ambient level |
| VerfasserIn |
J. S. Lim, D. M. Moon, J. S. Kim, W.-T. Yun, J. Lee |
| 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 ; 6, no. 9 ; Nr. 6, no. 9 (2013-09-05), S.2293-2299 |
| Datensatznummer |
250085056
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| Publikation (Nr.) |
 copernicus.org/amt-6-2293-2013.pdf |
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| Zusammenfassung |
| This work reports on the development of a technique for the precise analysis
of ambient SF6. This technique, which involves a gas
chromatograph/electron capture detector (GC-ECD) coupled with an Activated
Alumina-F1 (AA-F1) column, performed well in the measurements, particularly
in terms of accuracy, which complies with the World Meteorological
Organization (WMO)-recommended compatibility of 0.02 ppt. Compared to the
Porapak Q technique, we observed a sharper peak shape for the SF6
stream, which substantiates the improvement in the analytical precision. The
traceability to the WMO scale was tested by calibrating the GC-ECD/AA-F1
analyser using five SF6 standards provided by the WMO/Global Atmosphere
Watch (GAW) Central Calibration Laboratory (CCL) for SF6 (NOAA, United
States of America). After calibration by various methods, the GC-ECD/AA-F1
accurately estimated the mole fraction of SF6 in the working standard
prepared by the World Calibration Centre for SF6 operated by the Korea
Meteorological Administration (KMA)/Korea Research Institute of Standards and
Science (KRISS). Among the calibration methods, the two-point calibration
method emerged to be the most economical procedure in terms of the data
quality and measurement time. It was found that the KRISS scale of
SF6/N2 was biased by 0.13 ppt when compared to the WMO scale of
SF6/air; this bias is probably due to a different matrix. |
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