Diffusivity fractionations of H216O/H217O and H216O/H218O in air and their implications for isotope hydrology
Diffusivity fractionations of H216O/H217O and H216O/H218O in air and their implications for isotope hydrology
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DOI：
10.1002/rcm.3180
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发表时间：
2007-01-01
影响因子：
2
通讯作者：
Luz, Boaz
中科院分区：
文献类型：
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作者：
Barkan, Eugeni;Luz, Boaz
利用蒸发实验确定了O-17和O-18在水中取代O-16对空气中水蒸气分子扩散率的影响。得到的扩散分馏系数(17)α (diff)和(18)α (diff)分别为1.0146 +/- 0.0002和1.0283 +/- 0.0003。我们还首次确定了In((17)alpha(diff))/In(（18)alpha(diff)）的比值为0.5185 +/- 0.0002。该比值与理论值0.5184非常吻合，明显小于汽液平衡时的比值（0.529）。我们展示了这个新的实验信息是如何引起大气水中O-17过剩的，以及它如何应用于同位素水文学。版权所有(c) 2007约翰威利父子有限公司
We have determined the isotope effects of O-17 and O-18 substitution of O-16 in H2O on molecular diffusivities of water vapor in air by the use of evaporation experiments. The derived diffusion fractionation coefficients (17)alpha(diff) and (18)alpha(diff) are 1.0146 +/- 0.0002 and 1.0283 +/- 0.0003, respectively. We also determined, for the first time, the ratio In((17)alpha(diff))/In((18)alpha(diff)) as 0.5185 +/- 0.0002. This ratio, which is in excellent agreement with the theoretical value of 0.5184, is significantly smaller than the ratio in vapor-liquid equilibrium (0.529). We show how this new experimental information gives rise to O-17 excess in meteoric water, and how it can be applied in isotope hydrology. Copyright (c) 2007 John Wiley & Sons, Ltd.