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Sorption of Zr~(4+) and Hf~(4+) onto Hydrous Ferric Oxide and Their Fractionation Behaviors:An experimental Study
作者姓名:YU Wenhui  and LIU Congqiang The State Key Laboratory of Environmental Geochemistry  Institute of Geochemistry  Chinese Academy of Sciences  Guiyang  Guizhou  Graduate School of Chinese Academy of Sciences  Beijing
作者单位:YU Wenhui1,2 and LIU Congqiang1 1 The State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou 550002;2 Graduate School of Chinese Academy of Sciences,Beijing 100039
摘    要:1 Introduction Coherent element pairs (Y3+-Ho3+, Zr4+-Hf4+, Nb5+-Ta5+ and Sr2+-Eu2+) have the same valences and very similar ionic radii. They are seldom fractionated during silicate mineral/melt interaction systems because the partitioning of these element pairs between melts and minerals is tightly controlled by charge valence and crystal structure (lattice site size) or ionic radius. The concentration ratios of these pairs in igneous rocks are close to the chondritic values (Y/Ho=28, Zr…

关 键 词:水合氧化铁  HFO  吸附性能  摩擦性质  

Sorption of Zr~(4+) and Hf~(4+) onto Hydrous Ferric Oxide and Their Fractionation Behaviors:An experimental Study
Authors:YU Wenhui  and LIU Congqiang The State Key Laboratory of Environmental Geochemistry
Institution:YU Wenhui,and LIU Congqiang The State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou,Graduate School of Chinese Academy of Sciences,Beijing
Abstract:An experimental study was carried out on the sorption of tetravalent ions Zr4+ and Hf4+ onto hydrous ferric oxide (HFO) and their fractionation behavior during colloid/solution interaction. The sorption of the isovalent ions Zr4+ and Hf4+ onto HFO is nonlinear, and they are fractionated during the sorption and co-precipitation processes: Zr4+ is more affinitive for HFO than Hf4+. At pH<6, the Zr/Hf ratios in solid phase decrease sharply with increasing pH values, but keep unchanged at pH>6. In both cases, the sorption/desorption or particle/water reaction can significantly fractionate Zr/Hf in the surface environment of the Earth.
Keywords:zirconium  hafnium  HFO  sorption  fractionation  isovalent element
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