 |
| Titel |
On the reproducibility and repeatability of laser absorption spectroscopy measurements for δ2H and δ18O isotopic analysis |
| VerfasserIn |
D. Penna, B. Stenni, M. Šanda, S. Wrede, T. A. Bogaard, A. Gobbi, M. Borga, B. M. C. Fischer, M. Bonazza, Z. Chárová |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 8 ; Nr. 14, no. 8 (2010-08-13), S.1551-1566 |
| Datensatznummer |
250012400
|
| Publikation (Nr.) |
 copernicus.org/hess-14-1551-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
The aim of this study was to analyse the reproducibility of off-axis
integrated cavity output spectroscopy (OA-ICOS)-derived δ2H and
δ18O measurements on a set of 35 water samples by comparing the
performance of four laser spectroscopes with the performance of a
conventional mass spectrometer under typical laboratory conditions. All
samples were analysed using three different schemes of standard/sample
combinations and related data processing to assess the improvement of
results compared with mass spectrometry. The repeatability of the four
OA-ICOS instruments was further investigated by multiple analyses of a
sample subset to evaluate the stability of δ2H and δ18O measurements.
Results demonstrated an overall agreement between OA-ICOS-based and mass
spectrometry-based measurements for the entire dataset. However, a certain
degree of variability existed in precision and accuracy between the four
instruments. There was no evident bias or systematic deviations from the
mass spectrometer values, but random errors, which were apparently not
related to external factors, significantly affected the final results. Our
investigation revealed that analytical precision ranged ±from ±0.56‰ to
±1.80‰ for δ2H and from ±0.10‰ to ±0.27‰ for δ18O
measurements, with a marked variability among the four
instruments. The overall capability of laser instruments to reproduce stable
results with repeated measurements of the same sample was acceptable, and
there were general differences within the range of the analytical precision
for each spectroscope. Hence, averaging the measurements of three identical
samples led to a higher degree of accuracy and eliminated the potential for
random deviations. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|