Abstract
The stability constants, β1, of monochloride complex of Am(III) have been determined in a mixed system of dimethyl sulfoxide (DMSO) and water at 1.00 mol·dm−3 ionic strength using solvent extraction. The values of β1 in mixed DMSO+H2O solutions decrease rapidly with an increase in the mole fraction of DMSO (X s ) in mixed solvents and become negative ones, which is not in a definition of stability constant, inX s >0.04. The variation of β1 inX s ≦0.02 was accounted for by the size-variation of the primary solvation sphere around Am(III), which was present as a solventshared ion-pair, and by a little effect due to an invasion (coordination) of ClO4 − into the secondary solvation sphere of Am3+. On the other hand, it was concluded that the β1 obtained by solvent extraction inX s >0.02 was an apparent value, because of a large effect due to an invasion (coordination) of ClO4 − into the secondary solvation sphere of Am(III).
Similar content being viewed by others
References
J. G. Reppin, E. R. Vance, J. Inorg. Nucl. Chem., 43 (1981) 2807.
B. Fourest, J. Duplessis, F. David, Radiochim. Acta, 36 (1984) 191.
H. Suganuma, I. Satoh, T. Omori, M. Yagi, Radiochim. Acta, 77 (1997) 207.
H. Suganuma, I. Satoh, T. Omori, G. R. Choppin, Radiochim. Acta, 77 (1997) 211.
V. Gutmann, E. Wychera, Inorg. Nucl. Chem. Lett., 2 (1966) 257.
H. Suganuma, M. Nakamura, I. Satoh, T. Omori, J. Radioanal. Nucl. Chem., in submitting.
H. Suganuma, M. Nakamura, I. Satoh, T. Omori, J. Radioanal. Nucl. Chem., 227 (1998) 55.
H. Suganuma, M. Nakamura, I. Satoh, T. Omori, J. Radioanal. Nucl. Chem., in press.
G. R. Choppin, P. J. Unrein, Transplutonium Elements,W. Müller, R. Linder, (Eds) North-Holland Publishing Company, Amsterdam, 1976, p. 97.
H. Suganuma, T. Katoh, A. Suzuki, K. Onuki, I. Satoh, T. Omori, G. R. Choppin, Radiochim. Acta, 75 (1996) 17.
J. Padova, J. Chem. Phys., 39 (1963) 1552.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Suganuma, H., Satoh, I. Coordination of perchlorate ion in the secondary solvation sphere of Am3+ in the tracer concentrations in mixed system of dimethyl sulfoxide/water with 1.00M (H,Na)(Cl,ClO4). J Radioanal Nucl Chem 240, 193–196 (1999). https://doi.org/10.1007/BF02349153
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02349153