| Sorption of Zr~(4+) and Hf~(4+) onto Hydrous Ferric Oxide and Their Fractionation Behaviors:An experimental Study |
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| 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 |
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| 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 |
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| 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…
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| 关 键 词： | 水合氧化铁 HFO 吸附性能 摩擦性质 锆 |
Sorption of Zr~(4+) and Hf~(4+) onto Hydrous Ferric Oxide and Their Fractionation Behaviors:An experimental Study |
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| Authors: | YU Wenhui and LIU Congqiang The State Key Laboratory of Environmental Geochemistry |
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| 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 |
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| 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. |
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| Keywords: | zirconium hafnium HFO sorption fractionation isovalent element |
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