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Local structure of Y and Ho in calcite and its relevance to Y fractionation from Ho in partitioning between calcite and aqueous solution

https://hiroshima.repo.nii.ac.jp/records/2006584
https://hiroshima.repo.nii.ac.jp/records/2006584
ae9c5128-9205-44b4-ba14-67c2c821bfb6
名前 / ファイル ライセンス アクション
ChemGeol_248_104.pdf ChemGeol_248_104.pdf (1.5 MB)
Item type デフォルトアイテムタイプ_(フル)(1)
公開日 2023-03-18
タイトル
タイトル Local structure of Y and Ho in calcite and its relevance to Y fractionation from Ho in partitioning between calcite and aqueous solution
言語 en
作成者 Tanaka, Kazuya

× Tanaka, Kazuya

en Tanaka, Kazuya

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Takahashi, Yoshio

× Takahashi, Yoshio

en Takahashi, Yoshio

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Shimizu, Hiroshi

× Shimizu, Hiroshi

en Shimizu, Hiroshi

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利情報
権利情報 Copyright (c) 2007 Elsevier B.V.
主題
主題Scheme Other
主題 Y-Ho
主題
主題Scheme Other
主題 EXAFS
主題
主題Scheme Other
主題 local structure
主題
主題Scheme Other
主題 fractionation
主題
主題Scheme Other
主題 covalency
主題
主題Scheme NDC
主題 450
内容記述
内容記述 Among rare earth elements (REEs), the behavior of Y and Ho in most igneous activities is very close due to the similarity in their ionic radii, while Y fractionates from Ho in marine systems. In this study, in order to elucidate Y-Ho fractionation observed in marine systems in terms of structural chemistry, we examined Ho LIII-edge and Y K-edge EXAFS study for two partitioning systems, namely, 1) calcite-aqueous solution (Y-Ho fractionation system) and 2) strong acid cation exchange resin-aqueous solution (non-Y-Ho fractionation system). The results of the EXAFS analysis did not show significant differences in interatomic distances to the most neighboring O atoms between Ho and Y for all the samples. However, it was found that the first shell Ho-O and Y-O distances in the Y-Ho doped calcite were shorter than those in the aqua ion. In contrast, the first shell Ho-O and Y-O distances in the Y-Ho doped resin were similar to those in the aqua ion. Previous studies have suggested that lanthanide (Ln) is more covalent due to 4f orbital participation in bonding relative to Y. Spectroscopic studies on various Ln3+ complexes show that Racah parameters for 4f electron repulsion in Ln3+ ions decrease with an increase in covalency of bonding of Ln3+ ions with anionic ligands. Therefore, our EXAFS results suggest that Y-Ho fractionation in partitioning is possibly attributed to the difference of change in covalency associated with the ligand exchange between Y and Ho, which we have observed as differences in partition coefficients between calcite and aqueous solution.
言語 en
出版者
出版者 Elsevier B.V.
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
出版タイプ
出版タイプ AO
出版タイプResource http://purl.org/coar/version/c_b1a7d7d4d402bcce
関連情報
識別子タイプ DOI
関連識別子 10.1016/j.chemgeo.2007.11.003
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 http://dx.doi.org/10.1016/j.chemgeo.2007.11.003
収録物識別子
収録物識別子タイプ NCID
収録物識別子 AA0060201X
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0009-2541
開始ページ
開始ページ 104
書誌情報 Chemical Geology
Chemical Geology

巻 248, 号 1-2, p. 104-113, 発行日 2008-02
旧ID 23393
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