 |
| Titel |
A new CF-IRMS system for quantifying stable isotopes of carbon monoxide from ice cores and small air samples |
| VerfasserIn |
Z. Wang, J. E. Mak |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 5 ; Nr. 3, no. 5 (2010-10-05), S.1307-1317 |
| Datensatznummer |
250001293
|
| Publikation (Nr.) |
 copernicus.org/amt-3-1307-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| We present a new analysis technique for stable isotope ratios
(δ13C and δ18O) of atmospheric carbon monoxide
(CO) from ice core samples. The technique is an online cryogenic
vacuum extraction followed by continuous-flow isotope ratio mass
spectrometry (CF-IRMS); it can also be used with small air samples.
The CO extraction system includes two multi-loop cryogenic cleanup
traps, a chemical oxidant for oxidation to CO2, a cryogenic
collection trap, a cryofocusing unit, gas chromatography
purification, and subsequent injection into a Finnigan Delta Plus
IRMS. Analytical precision of 0.2‰ (±1δ)
for δ13C and 0.6‰ (±1δ) for
δ18O can be obtained for 100 mL (STP) air samples with CO
mixing ratios ranging from 60 ppbv to 140 ppbv
(~268–625 pmol CO). Six South Pole ice core samples from
depths ranging from 133 m to 177 m were processed for CO isotope
analysis after wet extraction. To our knowledge, this is the first
measurement of stable isotopes of CO in ice core air. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|