Adsorption isotope effects of water on mesoporous silica and alumina with implications for the land-vegetation-atmosphere system
Lin, Ying1,2; Horita, Juske1; Abe, Osamu3; Lin, Ying(Texas Tech Univ, Dept Geosci, Lubbock, TX 79409 USA); Horita, Juske(Texas Tech Univ, Dept Geosci, Lubbock, TX 79409 USA)
2018-02-15
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
卷号223页码:520-536
产权排序第1完成单位 ; 第2完成单位 ; 第3完成单位
摘要Soil water dynamics within a vadose (unsaturated) zone is a key component in the hydrologic cycle, especially in arid regions. In applying the Craig-Gordon evaporation model to obtain isotopic compositions of soil water and the evaporated vapor in land-surface models (LSMs), it has been assumed that the equilibrium isotope fractionation factors between soil water and water vapor, alpha(H-2) and alpha(O-18), are identical to those between liquid and vapor of bulk water. Isotope effects in water condensation arise from intermolecular hydrogen bonding in the condensed phase and the appearance of hindered rotation/translation. Hydrogen bonding between water molecules and pore surface hydroxyl groups influences adsorption isotope effects. To test whether equilibrium fractionation factors between soil water and water vapor are identical to those between liquid and vapor of bulk water and to evaluate the influence of pore size and chemical composition upon adsorption isotope effects, we extended our previous experiments of a mesoporous silica (15 nm) to two other mesoporous materials, a silica (6 nm) and an alumina (5.8 nm). Our results demonstrated that alpha(H-2) and alpha(O-18) between adsorbed water and water vapor are 1.057 and 1.0086 for silica (6 nm) and 1.041 and 1.0063 for alumina (5.8 nm), respectively, at saturation pressure (p(o)), which are smaller than 1.075 and 1.0089, respectively, between liquid and vapor phases of free water at 30 degrees C and that the differences exaggerate at low water contents. However, the profiles of alpha values with relative pressures (p/p(o)) for these three materials differ due to the differences in chemical compositions and pore sizes. Empirical formula relating alpha(H-2) and alpha(O-18) values to the proportions of filled pores (f) are developed for potential applications to natural soils. Our results from triple oxygen isotope analyses demonstrated that the isotope fractionation does not follow a canonical law. For the silica (15 nm), fractionation exponents ((17)theta) are 0.5361 +/- 0.0018 and 0.5389 +/- 0.0016 at p/p(o) = 0.72 and 0.77, respectively. For the silica (6 nm), (17)theta values are 0.5330 +/- 0.0011 at p/p(o) = 0.65 and 0.5278 +/- 0.0010 at p/p(o) = 0.81. For the alumina (5.8 nm), (17)theta value is 0.5316 +/- 0.0015 at p/p(o) = 0.78. These values are greater than or equal to that of liquid-vapor equilibrium of bulk water (0.529 +/- 0.001). (C) 2018 Elsevier Ltd. All rights reserved.
文章类型Article
关键词Adsorption Isotope Effects Liquid-vapor Equilibrium Craig-gordon Evaporation Model Isotope Fractionation Factor Isotope Fractionation Exponent
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.gca.2017.12.021
URL查看原文
收录类别SCI
语种英语
关键词[WOS]HIGH-PRECISION MEASUREMENTS ; OXYGEN-ISOTOPE ; NITROGEN ADSORPTION ; O-18/O-16 RATIOS ; STABLE-ISOTOPES ; POROUS TEXTURE ; SURFACE MODEL ; FRACTIONATION ; VAPOR ; ISOTHERMS
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000424973200029
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被引频次:2[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/183446/5924
专题深海科学研究部_深海地质与地球化学研究室
通讯作者Lin, Ying; Horita, Juske; Lin, Ying(Texas Tech Univ, Dept Geosci, Lubbock, TX 79409 USA); Horita, Juske(Texas Tech Univ, Dept Geosci, Lubbock, TX 79409 USA)
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
3.Nagoya Univ, Grad Sch Environm Studies, Nagoya, Aichi 4648601, Japan
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Lin, Ying,Horita, Juske,Abe, Osamu,et al. Adsorption isotope effects of water on mesoporous silica and alumina with implications for the land-vegetation-atmosphere system[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2018,223:520-536.
APA Lin, Ying,Horita, Juske,Abe, Osamu,Lin, Ying,&Horita, Juske.(2018).Adsorption isotope effects of water on mesoporous silica and alumina with implications for the land-vegetation-atmosphere system.GEOCHIMICA ET COSMOCHIMICA ACTA,223,520-536.
MLA Lin, Ying,et al."Adsorption isotope effects of water on mesoporous silica and alumina with implications for the land-vegetation-atmosphere system".GEOCHIMICA ET COSMOCHIMICA ACTA 223(2018):520-536.
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