Study on the mechanism of isotope fractionation in soil water during the evaporation process under equilibrium condition

查看全文 作　　者：SUN [1,2]Xiaoxu;CHEN [1,3]Jiansheng;TAN [3]Hongbing;RAO [3]Wenbo;WANG [1]Yongsen;LIU [1]Xiaoyan;SU [1]Zhiguo

机构地区：[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;[2]College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;[3]Reserch Institute of Science and Technology, Hohai University, Nanjing 210098, China

出　　处：《Chinese Journal Of Geochemistry》索引2009年第28卷第4期,共7页

基　　金：supports provided by International Atomic Energy TC Project (No. PRC\08\015);the National Natural Science Founda-tion of China (No. 50579017) 摘　　要：In this study, with the method of vacuum extraction, two evaporative processes of soil water and free water under equilibrium condition were simulated. For each sample,water vapor was condensed by liquid nitrogen and was collected in four time intervals. From the analysis of hydrogen and oxygen isotopic compositions of the water collected at different times, it was discovered that the isotope fractionation of soil water also follows the mode, which is just the same as the evaporative process of free water. The relationship between the stable hydrogen and oxygen isotopes in residual water showed that the simulative evaporation line was close to the global meteoric water line (GMWL) under the equilibrium condition at about 20℃. Comparison of the two types of evaporative processes indicated that the isotope fractionation and evaporation velocity of soil water were only slightly modified by the Van der Waals force. 关键词：氧同位素分析土壤水分平衡条件工艺条件水蒸发分馏机理同位素分馏水汽凝结

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Study on the mechanism of isotope fractionation in soil water during the evaporation process under equilibrium condition

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