Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA.
Rapid Commun Mass Spectrom. 2010 Mar;24(6):773-6. doi: 10.1002/rcm.4449.
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 (18)O/(16)O ratios. Measurements of the delta(17)O composition constitute therefore an appropriate independent check of the achieved isotopic adjustment. Aliquots from ampoules of VSMOW, VSMOW2, SLAP, and SLAP2 were fluorinated by BrF(5) 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 delta(17)O and delta(18)O 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 delta(17)O value of SLAP2 seem desirable.
由于两种主要校准材料——维也纳标准平均海水（VSMOW）和标准南极降水（SLAP）的耗尽，两种替代材料——VSMOW2 和 SLAP2 被创建，它们的同位素组成在 D/H 和 (18)O/(16)O 比率方面尽可能接近原始标准。因此，δ(17)O 组成的测量是对所实现的同位素调整的适当独立检查。从 VSMOW、VSMOW2、SLAP 和 SLAP2 的安瓿中取出等分试样，用 BrF(5)氟化，并使用双入口 Delta E 质谱仪进行分析。在测量不确定度内，VSMOW2 和 SLAP2 在 δ(17)O 和 δ(18)O 值方面分别与 VSMOW 和 SLAP 无法区分。这一结果证实了 VSMOW2 和 SLAP2 与其前身的成功同位素匹配。似乎有必要进一步检查 SLAP2 的 δ(17)O 值。
