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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
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
Volume184Pages:257-271
AbstractSoil 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.
SubtypeArticle
KeywordMesoporous Silica Adsorption-desorption Isotherm Equilibrium Isotope Fractionation Factor The Craig-gordon Evaporation Model Vadose-zone Isotope Hydrology
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.gca.2016.04.029
Indexed BySCI
Language英语
WOS KeywordPORE-SIZE DISTRIBUTION ; STABLE-ISOTOPES ; UNSATURATED ZONE ; OXYGEN-ISOTOPE ; ADSORPTION-ISOTHERMS ; DIRECT EQUILIBRATION ; NITROGEN ADSORPTION ; NEUTRON-SCATTERING ; DELTA-O-18 VALUES ; NUMERICAL-MODEL
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000376168800015
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.idsse.ac.cn/handle/183446/1571
Collection深海科学研究部_深海地质与地球化学研究室
Affiliation1.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
Recommended Citation
GB/T 7714
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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