Thermodynamic Modeling of Actinide Complexation with Acetate and Lactate at High Ionic Strength |
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Authors: | Robert C Moore Marian Borkowski Michael G Bronikowski Jianfeng Chen Oleg S Pokrovsky Yuanxian Xia Gregory R Choppin |
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Institution: | (1) Sandia National Laboratories, Albuquerque, New Mexico, 87185–0733;(2) Department of Chemistry, Florida State University, Tallahassee, Florida, 32306;(3) Nuclear Chemistry and Technology, 03–195 Warsaw, Poland |
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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 (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 (0), (1), and C On leave from Institute of |
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Keywords: | Actinides acetate lactate Complexation Pitzer parameters |
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