The binding constants of Eu and Th with humic materials

被引：4

作者：

Helal A.A. ^{[1
,2
]}

Khalifa S.M. ^{[1
]}

Mourad G.A. ^{[1
]}

机构：

[1] Hot Labs. Center, Atomic Energy Authority, Cairo

[2] Department of Chemistry, Ibri College of Education

来源：

Radiochemistry | 2005年 / 47卷 / 5期

关键词：

Carboxylate; Humic Acid; Solvent Extraction; Fulvic Acid; Binding Constant;

D O I：

10.1007/s11137-005-0132-4

中图分类号：

学科分类号：

摘要：

The binding constants for Eu and Th fulvate complexes were measured by the solvent extraction technique. For comparison, the binding constant for the Eu humate complex was also investigated. The measurements were carried out radiometrically using 152, 154Eu and 234Th. The results indicate that, in case of fulvic acid, one parameter, β1, was required to fit the binding as a function of carboxylate concentration. With humic acid, Eu3+ formed 1 : 1 and 1 : 2 complexes, and two parameters, β1 and β2, were required. In both cases, the strength of binding increased with pKa and degree of ionization of the ligands and with the valence of the metal ions. ©2005 Pleiades Publishing, Inc.

引用

页码：520 / 524

页数：4

共 20 条

[1] Rashid M.A., Geochemistry of Marine Humic Compounds, (1985)
[2] Grishina L.A., Korotkov K.O., Sov. Soil Sci., 10, (1978)
[3] Monsallier J.N., Scherbaum F.J., Buckau G., Et al., J. Photochem. Photobiol. A: Chem., 138, (2001)
[4] Torres T., Choppin G.R., Radiochim. Acta, 35, (1984)
[5] Moulin V.L., Les Acides Humiques et Leurs Interactions Avec Les Elements Metalliques Cu(II), Eu(III), Th(IV), U(VI), (1985)
[6] Kim J.I., Marquardt C.M., Radiochim. Acta, 87, (1999)
[7] Diercks A.V., Maes A., Report RCM 00392, (1992)
[8] Kim J.I., Buckau G., Bryant E., Klenze R., Radiochim. Acta, 48, (1989)
[9] Kim J.I., Vimmer H., Klenze R., Radiochim. Acta, 54, (1991)
[10] Caceci M., Radiochim. Acta, 39, (1994)

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