An experimental study on isotope fractionation in a mesoporous silica-water system with implications for vadose-zone hydrology
Lin, Ying1,2; Horita, Juske1
2016-07-01
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
卷号184页码:257-271
摘要Soil water dynamics within a thick vadose (unsaturated) zone is a key component in the hydrologic cycle in arid regions. In isotopic studies of soil water, the isotopic composition of adsorbed/pore-condensed water within soils has been assumed to be identical to that of bulk liquid water. To test this critical assumption, we have conducted laboratory experiments on equilibrium isotope fractionation between adsorbed/condensed water in mesoporous silica (average pore diameter 15 nm) and the vapor at relative pressures p/p(o) = 0.3-1.0 along the adsorption-desorption isotherm at 30 degrees C. The isotope fractionation factors between condensed water in the silica pores and the vapor, alpha(H-2) and alpha(O-18), are smaller than those between liquid and vapor of bulk water (1.074 and 1.0088, respectively, at 30 degrees C). The alpha(H-2) and alpha(O-18) values progressively decrease from 1.064 and 1.0083 at p/p(o) = 1 to 1.024 and 1.0044 at p/p(o) = 0.27 for hydrogen and oxygen isotopes, respectively, establishing trends very similar to the isotherm curves. Empirical formulas relating alpha(H-2) and alpha(O-18) to the proportions of filled pores (f) are developed. Our experimental results challenge the long-held assumption that the equilibrium isotope fractionation factors for the soil water-vapor are identical to those of liquid water-vapor system with potential implications for arid-zone and global water cycles, including paleoclimate proxies in arid regions. (C) 2016 Elsevier Ltd. All rights reserved.
文章类型Article
关键词Mesoporous Silica Adsorption-desorption Isotherm Equilibrium Isotope Fractionation Factor The Craig-gordon Evaporation Model Vadose-zone Isotope Hydrology
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.gca.2016.04.029
收录类别SCI
语种英语
关键词[WOS]PORE-SIZE DISTRIBUTION ; STABLE-ISOTOPES ; UNSATURATED ZONE ; OXYGEN-ISOTOPE ; ADSORPTION-ISOTHERMS ; DIRECT EQUILIBRATION ; NITROGEN ADSORPTION ; NEUTRON-SCATTERING ; DELTA-O-18 VALUES ; NUMERICAL-MODEL
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000376168800015
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.idsse.ac.cn/handle/183446/1571
专题深海科学研究部_深海地质与地球化学研究室
作者单位1.Texas Tech Univ, Dept Geosci, Lubbock, TX 79409 USA
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Luhuitou Rd 28, Sanya 572000, Hainan, Peoples R China
第一作者单位中国科学院深海科学与工程研究所
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Lin, Ying,Horita, Juske. An experimental study on isotope fractionation in a mesoporous silica-water system with implications for vadose-zone hydrology[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2016,184:257-271.
APA Lin, Ying,&Horita, Juske.(2016).An experimental study on isotope fractionation in a mesoporous silica-water system with implications for vadose-zone hydrology.GEOCHIMICA ET COSMOCHIMICA ACTA,184,257-271.
MLA Lin, Ying,et al."An experimental study on isotope fractionation in a mesoporous silica-water system with implications for vadose-zone hydrology".GEOCHIMICA ET COSMOCHIMICA ACTA 184(2016):257-271.
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