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

被引：0
|
作者：
T. Sakuragi
S. Sawa
S. Sato
T. Kozaki
T. Mitsugashira
M. Hara
Y. Suzuki
机构：
[1] Hikkaido University,Graduate School of Engineering
[2] Tohoku University,Oarai branch, Institute for Materials Research
[3] National Institute of Radiological Sciences,Environment Radiation Protection Research Group, Research Center for Radiation Safety
[4] Ishikawajima-Harima Heavy Industries Co.,undefined
[5] Ltd,undefined
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2004年 / 261卷
关键词：
Physical Chemistry; Inorganic Chemistry; Humic Acid; Extraction Method; Cation Exchange;
D O I：
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中图分类号：
学科分类号：
摘要：
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 logβ1 and logβ2 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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页码：309 / 314
页数：5
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