Complexation of americium(III) with humic acid by cation exchange and solvent extraction

T. Sakuragi; S. Sawa; S. Sato; T. Kozaki; T. Mitsugashira; M. Hara; Y. Suzuki

doi:10.1023/b:jrnc.0000034864.43447.88

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 261: Issue 2

Complexation of americium(III) with humic acid by cation exchange and solvent extraction

Authors:

T. Sakuragi

T. Sakuragi Hikkaido University Graduate School of Engineering Kita 13 Nishi 8 Sapporo 060-8628 Japan

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S. Sawa

S. Sawa Hikkaido University Graduate School of Engineering Kita 13 Nishi 8 Sapporo 060-8628 Japan

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S. Sato

S. Sato Hikkaido University Graduate School of Engineering Kita 13 Nishi 8 Sapporo 060-8628 Japan

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T. Kozaki

T. Kozaki Hikkaido University Graduate School of Engineering Kita 13 Nishi 8 Sapporo 060-8628 Japan

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T. Mitsugashira

T. Mitsugashira Tohoku University Oarai branch, Institute for Materials Research Narita-machi Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1313 Japan

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M. Hara

M. Hara Tohoku University Oarai branch, Institute for Materials Research Narita-machi Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1313 Japan

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Y. Suzuki

Y. Suzuki Tohoku University Oarai branch, Institute for Materials Research Narita-machi Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1313 Japan

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Pages:: 309–314

Online Publication Date:: 03 Nov 2004

Publication Date:: 17 Aug 2004

Article Category:: Research Article

DOI:: https://doi.org/10.1023/b:jrnc.0000034864.43447.88

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Abstract

Complexation of Am(III) with humic acid was studied at various pHs in 0.1M NaClO₄. The stability constants of the Am(III)—humate complexes were determined by a cation-exchange method. The values of log₁ and log₂ increased slightly with increases of pH from 4 to 6 and were found to be 6.9 and 11.6, respectively, at a pH of 5. Markedly larger values than these were obtained by a solvent extraction method. This discrepancy was also revealed by summarizing data from several literature sources. It is very likely that this can be ascribed to decreases in either humic acid and/or the extractant from the extraction system due to humate interactions at the aqueous-organic interface.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)