Complexation of U(VI), Ce(III) and Nd(III) with acetohydroxamic acid in perchlorate aqueous solution |
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Authors: | Dong-Yong Chung Eun-Kyoung Choi Eil-Hee Lee Kwang-Wook Kim |
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Institution: | (1) Decommissioning Technology Development Division, Korea Atomic Energy Research Institute, 1045 Daedeok-daero Yuseong-gu, Daejeon, 305-353, Republic of Korea |
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Abstract: | Complexes of UO2
2+, Ce3+ and Nd3+ (M) with acetohydroxamic acid (AHA or L) in an aqueous solution have been investigated by the pH-spectral titration method
at 25 °C in an aqueous medium of 1.0 M NaClO4 ionic strength. Cerium(III) and neodymium(III) form ML]2+, ML2]+, ML3] complexes with acetohydroxamic acid, while in case of UO2
2+ form UO2L]+, UO2L2] complexes with acetohydroxamic acid. Data processing with SQUAD program calculates the best values for the stability constants
from pH-spectrophotometric titration data. The protonation constant obtained was pK1 = 9.15 ± 0.04 at 25 °C. The stability constants for acetohydroxamic acid with UO2
2+, Ce3+ and Nd3+ were β1 = 7.22 ± 0.011, β2 = 14.89 ± 0.018 for UO2
2+ and β1 = 5.05 ± 0.062, β2 = 10.60 ± 0.076, β3 = 16.23 ± 0.088 for Ce3+ and β1 = 5.90 ± 0.028, β2 = 12.22 ± 0.038, β3 = 18.58 ± 0.042 for Nd3+, respectively. |
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