Abstract
The stability constants of NpO +2 , UO 2+2 Am3+, and Th4+ with acetate and lactate anions has been measured in 0.3–5.0m NaCl media at 25°C by the solvent extraction technique. For the 1:1 complexation, the values of the stability constants increased in the order: NpO +2 < Am3+ < 2+2 < Th4+, in accordance with the actinide charge density and reflecting the strongly ionic bonding of the complexes. The Pitzer ionic interaction parameters were calculated and used to estimate the thermodynamic stability constants at I = 0. Because our data were collected mainly in the high ionic strength region values of β(1) were estimated from values reported in the literature. For all stability constants the Pitzer model gives an excellent representation of the data using three interaction parameters β(0), β(1), and Cφ
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REFERENCES
V. A. Vodovatov, V. B. Kolokoltsov, T. V. Kovaleva, L. C. Macirov, D. N. Suglebov, and V. T. Sles, Radiokimiya 17, 889 (1975).
F. Rösch, S. Dittrich, G. V. Buklanov, M. Milanov, V. A. Khalkin, and R. Dreyer, Radiochim. Acta 49, 29 (1990).
A. I. Moskvin, and M. P. Mefod'eva, Radiochim. Acta 7, 410 (1965).
S. H. Eberle, and J. B. Schaefer, J. Inorg. Nucl. Chem. 31, 1523 (1969).
A. I. Moskvin, Soviet Radiochem. 11, 447 (1969).
J. Stary, and V. Balek, Collection Czechoslov. Chem. Commun. 27, 809 (1962).
V. G. Voden, M. E. Obukhova, and M. F. Pushlenkov, Soviet Radiochem. 11, 633 (1969).
V. K. Rao, G. R Mahajan, and P. R. Natarajan, Inorg. Chim. Acta 128, 131 (1987).
I. Grenthe, Acta Chem. Scand. 16, 1695 (1962).
N. A. Skorik, and A. S. Artish, Russ. J. Inorg. Chem. 30, 1130 (1985).
L. P. Lisovaya, and N. A. Skorik, Russ. J. Inorg. Chem. 18, 599 (1973).
I. Feldman, and L. Koval, Inorg. Chem. 2, 145 (1963).
C. E. Harvie, N. Møller, and J. H. Weare, Geochim. Cosmochim. Acta 48, 723 (1984).
C. F. Novak, R. C. Moore, and R. V. Bynum, Proc. 1996 Intern. Confe. Deep Geological Disposal of Radioactive Wastes, Winnipeg, Manitoba, Canada, 16–19 Sept., 1996, SAND 96–2695c.
C. F. Novak, M. Borkowski, and G.R. Choppin, Radiochim. Acta 74, 111 (1996).
G. R. Choppin, A. H. Bond, M. Borkowski, M. G. Bronikowski, J. F. Chen, N. A. Labonne-Wall, S. Lis, J. Mizeria, O. Pokrovsky, Y. Xia, and R. C. Moore, Report in preparation for Sandia National Laboratory. Currently unpublished data furnished by personal communication. (1998).
K. S. Pitzer, J. Phys. Chem. 77, 268 (1973).
A. R. Felmy, D. Rai, J. A. Schramke and J. L. Ryan, Radiochim. Acta 48, 29 (1989).
A. R. Felmy, D. Rai, and M. J. Mason, Radiochim. Acta 55, 177 (1991).
Th. Fanghanel, V. Neck, and J. L. Kim, Radiochim. Acta 69, 169 (1995).
K.S. Pitzer, Activity Coefficients in Electrolyte Solutions CRC Press, Boca Raton, FL, (1991).
J. Mizera, A. H. Bond, G. R. Choppin, and R. C. Moore, Proc. Am. Chem. Soc. Orlando, FL, August, 1996, to be published (1999).
Neck V., J. I. Kim, and B. Kanellakopulos, Thermodynamic Behavior of Neptunium (V) in Concentrated NaCl and NaClO 4 Solutions Raport KfK 5301 (1994).
R. N. Roy, K. M. Vogel, C. E. Good, W. B. Davis, L. N. Roy, D. A. Johnson, A. R. Felmy, and K. S. Pitzer, J. Phys. Chem. 96, 11065 (1992).
R. E. Mesmer, C. S. Patterson, C. H. Busey, and H. F. Holmes, J. Phys. Chem. 93, 7483 (1989).
A. T. Plyasunov, T. Fanghänel, and I. Grente, Acta Chem. Scand. 52, 250 (1998).
O. S. Pokrovsky, M. G. Bronikowski, R. C. Moore, and G. R. Choppin, Radiochim. Acta 80, 23 (1998).
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Moore, R.C., Borkowski, M., Bronikowski, M.G. et al. Thermodynamic Modeling of Actinide Complexation with Acetate and Lactate at High Ionic Strength. Journal of Solution Chemistry 28, 521–531 (1999). https://doi.org/10.1023/A:1022678814904
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DOI: https://doi.org/10.1023/A:1022678814904