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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Negligible fractionation of Kr and Xe isotopes by molecular diffusion in water
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Negligible fractionation of Kr and Xe isotopes by molecular diffusion in water

机译：通过水中的分子扩散可忽略Kr和Xe同位素的分馏

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摘要

Molecular diffusion is a key transport process for noble gases in water. Such diffusive transport is often thought to cause a mass-dependent fractionation of noble gas isotopes that is inversely proportional to the square root of the ratio of their atomic mass, referred to as the square root relation. Previous studies, challenged the commonly held assumption that the square root relation adequately describes the behaviour of noble gas isotopes diffusing through water. However, the effect of diffusion on noble gas isotopes has only been determined experimentally for He, Ne and Ar to date, whereas the extent of fractionation of Kr and Xe has not been measured. In the present study the fractionation of Kr and Xe isotopes diffusing through water immobilised by adding agar was quantified through measuring the respective isotope ratio after diffusing through the immobilised water. No fractionation of Kr and Xe isotopes was observed, even using high-precision noble gas analytics. These results complement our current understanding on isotopic fractionation of noble gases diffusing through water. Therefore this complete data set builds a robust basis to describe molecular diffusion of noble gases in water in a physical sound manner which is fundamental to assess the physical aspects of gas dynamics in aquatic systems. (C) 2018 Published by Elsevier B.V.
机译：分子扩散是水中惰性气体的关键运输过程。通常认为这种漫游的速率是导致惰性气体同位素的质量依赖性分馏，其与其原子质量比的平方根成反比，称为平方根关系。以前的研究，挑战平方根关系的常见假设是充分描述了扩散通过水的高贵气体同位素的行为。然而，扩散对惰性气体同位素的影响仅针对他，NE和AR进行了实验确定的，而尚未测量KR和XE的分馏程度。在本研究中，通过在扩散通过固定的水之后测量相应的同位素比来定量通过加入琼脂固定的水的XE同位素的分馏。甚至使用高精度惰性气体分析，未观察到Kr和Xe同位素的分馏。这些结果补充了我们目前对漫射通过水的高贵气体的同位素分馏的理解。因此，该完整数据集构建了一种强大的基础，以描述以物理声音方式描述惰性气体在水中的分子扩散，这是评估水生系统中气体动力学的物理方面的基础。 （c）2018由elestvier b.v出版。

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