REE(III) ADSORPTION ONTO MN DIOXIDE (δ-MNO2) AND FE OXYHYDROXIDE: CE(III) OXIDATION BY δ-MNO2

dc.contributor.author	Ohta A.
dc.contributor.author	Kawabe I.
dc.date.accessioned	2021-02-12T04:05:03Z
dc.date.available	2021-02-12T04:05:03Z
dc.date.issued	2001
dc.identifier	https://www.elibrary.ru/item.asp?id=598775
dc.identifier.citation	Geochimica et Cosmochimica Acta, 2001, 65, 5, 695-703
dc.identifier.issn	0016-7037
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/24754
dc.description.abstract	The adsorption experiments of rare-earth elements (REE) onto δ-MnO2 and Fe oxyhydroxide precipitates suspended in aqueous NaCl solutions have been conducted. The distribution coefficients, Kd(REE: precipitate/solution) between suspended δ-MnO2 and solutions show extremely large positive Ce anomalies unlike those between Fe oxyhydroxide precipitates and solutions. The iodometric titration of δ-MnO2 precipitates containing different amounts of scavenged Ce reveals that Ce(III) is oxidized to Ce(IV) by δ-MnO2. A convex tetrad effect observed in the series variations of log Kd(REE) between suspending δ-MnO2 and solutions becomes conspicuous with increasing pH in the range of 4.8 < pH < 6.8. This reflects the changing ratio of hydroxyl ion to water molecule coordinating REE(III) adsorbed on δ-MnO2 suspensions with increasing experimental pH in the solution.
dc.title	REE(III) ADSORPTION ONTO MN DIOXIDE (δ-MNO2) AND FE OXYHYDROXIDE: CE(III) OXIDATION BY δ-MNO2
dc.type	Статья

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