| 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 |
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|
タイトル |
Chemical and structural control of the partitioning of Co, Ce, and Pb in marine ferromanganese oxides |
|
言語 |
en |
| 作成者 |
Takahashi, Yoshio
Manceau, Alain
Geoffroy, Nicolas
Marcus, Matthew A.
Usui, Akira
|
| アクセス権 |
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|
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 |
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|
権利情報 |
Copyright (c) 2006 Elsevier Inc. |
| 主題 |
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主題Scheme |
NDC |
|
主題 |
430 |
| 内容記述 |
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内容記述 |
The oxidation state and mineral phase association of Co, Ce, and Pb in hydrogenetic, diagenetic, and hydrothermal marine ferromanganese oxides were characterized by X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy and chemical extraction. Cobalt is trivalent and associated exclusively with the Mn oxide component (vernadite). Cerium is tetravalent in all genetic-type oxides (detection limit for Ce(III) ~ 5 at. %), including Fe-rich areas (ferrihydrite) of hydrogenetic oxides, and is associated primarily with vernadite. Thus, the extent of a Ce anomaly does not result from variations in redox conditions, but appears to be kinetically controlled, decreasing when the growth rate increases from hydrogenetic to diagenetic to hydrothermal oxides. Lead is divalent and associated with Mn and Fe oxides in variable proportions. According to EXAFS data, Pb is mostly sorbed on edge sites at chain terminations in Fe oxide and at layer edges in Mn oxide (ES complex), and also on interlayer vacancy sites in Mn oxide (TCS complex). Sequential leaching experiments, spectroscopic data, and electrochemical considerations suggest that the geochemical partitioning in favor of the Mn oxide component decreases from Co to Ce to Pb, and depends on their oxidative scavenging by Mn and Fe oxides. |
|
言語 |
en |
| 出版者 |
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|
出版者 |
Pergamon-Elsevier Science Ltd. |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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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 |
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|
識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.gca.2006.11.016 |
| 関連情報 |
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|
識別子タイプ |
DOI |
|
|
関連識別子 |
http://dx.doi.org/10.1016/j.gca.2006.11.016 |
| 収録物識別子 |
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収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0016-7037 |
| 収録物識別子 |
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収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA00655038 |
| 開始ページ |
|
|
開始ページ |
984 |
| 書誌情報 |
Geochimica et Cosmochimica Acta
Geochimica et Cosmochimica Acta
巻 71,
号 4,
p. 984-1008,
発行日 2007-02-15
|
| 旧ID |
20641 |
GCA_71-4_984.pdf (878.4 KB)
