Calibration of δ17O and δ18O of international measurement standards – VSMOW,VSMOW2, SLAP,and SLAP2 |
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| Authors: | Ying Lin Robert N Clayton Manfred Gröning |
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| Institution: | 1. Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA;2. The Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA;3. Department of Chemistry, University of Chicago, Chicago, IL 60637, USA;4. Isotope Hydrology Laboratory, International Atomic Energy Agency, P.O. Box 100, A‐1400 Vienna, Austria |
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| Abstract: | Due to exhaustion of the two primary calibration materials, Vienna Standard Mean Ocean Water (VSMOW) and Standard Light Antarctic Precipitation (SLAP), two replacement materials, VSMOW2 and SLAP2, were created with isotopic compositions as close as possible to the original standards in their D/H and 18O/16O ratios. Measurements of the δ17O composition constitute therefore an appropriate independent check of the achieved isotopic adjustment. Aliquots from ampoules of VSMOW, VSMOW2, SLAP, and SLAP2 were fluorinated by BrF5 and analyzed using a dual‐inlet Delta E mass spectrometer. VSMOW2 and SLAP2 were found to be indistinguishable from VSMOW and SLAP, respectively, in their δ17O and δ18O values within measurement uncertainties. This result is a confirmation of the successful isotopic matching of VSMOW2 and SLAP2 to their predecessors. Further checks of the δ17O value of SLAP2 seem desirable. Copyright © 2010 John Wiley & Sons, Ltd. |
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