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| Titel |
Influence of pH on Δ¹⁷O using the conventional equilibration device and a comparision to the CoF3 method |
| VerfasserIn |
S. Ranjan, M. Leuenberger, R. Winkler, A. Landais |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063387
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| Zusammenfassung |
| We have analysed precipitaion samples taken from Jungfraujoch for pH variations, using a pH sonde (WTW company) with a repeatibility of ±.01 pH unit. The values range between 3.78 and 6.95 pH units; average of four measurements of each sample. Previously samples have been analysed for stable isotopes (d18O, dD) and from d45, d46, Δ17O has been calculated. Elsig and Leuenberger (2008) observed that the pH has a strong influence on the Δ17O during the isotope equilibration between water and CO2 (13C effect) if pH values are above 4 pH units. We rerun all samples, now buffered to pH 4. Those 13C independent values were compared to those obtained by a CoF3 method (Barkan et.al, 2007). The precision of the CoF3 method is superior over the equilibration method even under buffered condition.
References
1. J. Elsig et.al.,Measurements of the 17O Excess in water with the equilibration method. Analytical Chemistry, 80/9 3244(2008),10.1021/ac702436t
2. E. Barkan et.al., Diffusivity fractionations of H2160/H217O and H216O/H218O in air and their implications for isotope hydrology.Rapid Communication In mass Spectrometry 21 2999(2007), 10.1002/rcm.3180 |
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