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  • 1 University of Tokyo Department of Chemistry, School of Science Hongo 113 Tokyo Japan
  • | 2 Japan Atomic Energy Research Institute Tokai Research Establishment Tokai 319-11 Ibaraki Japan
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Binding constants of Eu(III)- and Am(III)-complexes with soil-derived humic acid were determined by solvent extraction at various pH and ionic strength. Based on the dependence of binding constants on pH and ionic strength, stabilities of the humate complexes in land water and seawater were estimated. Speciation calculation based on the binding constants indicated that Am(III) could combine with humic substances in natural water system.