DOI: 10.1016/j.epsl.2018.03.047
Scopus记录号: 2-s2.0-85045080253
论文题名: Negligible fractionation of Kr and Xe isotopes by molecular diffusion in water
作者: Tyroller L. ; Brennwald M.S. ; Busemann H. ; Maden C. ; Baur H. ; Kipfer R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492 起始页码: 73
结束页码: 78
语种: 英语
英文关键词: diffusion coefficient
; Graham's Law
; isotope ratio
; kinetic fractionation
; noble gases
Scopus关键词: Diffusion
; Diffusion in liquids
; Diffusion in solids
; Gas dynamics
; Isotopes
; Diffusive transport
; Graham's Law
; Isotope ratio
; Isotopic fractionations
; Kinetic fractionations
; Molecular diffusion
; Noble gas isotopes
; Transport process
; Inert gases
; aquatic environment
; diffusion
; immobilization
; isotopic fractionation
; isotopic ratio
; krypton
; reaction kinetics
; water
; xenon
英文摘要: 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. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109894
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, Zürich, Switzerland; ETH Zurich, Institute of Geochemistry and Petrology, Zürich, Switzerland
Recommended Citation:
Tyroller L.,Brennwald M.S.,Busemann H.,et al. Negligible fractionation of Kr and Xe isotopes by molecular diffusion in water[J]. Earth and Planetary Science Letters,2018-01-01,492