Formation of americium(III) complexes with aqueous silicic acid
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W. Wadsak
The interaction of americium(III) with aqueous silicic acid was studied by competitive solvent extraction with 0.1 M thenoyltrifluoroacetone (HTTA) as extractant. The aqueous phase contained only 0.2 M NaClO4 or additionally 0.03 M silicic acid at p[H] 3.0-3.8 adjusted with perchloric acid. 241Am was used in tracer amounts and its distribution ratio was measured γ -spectrometrically. Silicic acid solutions were prepared by hydrolysis of tetramethylorthosilicate (TMOS). Kinetic investigations with the molybdate reaction showed polymeric silica fractions between 10-17% within the p[H] range investigated. Extraction times of about 1.5 hours were taken to assure distribution equilibrium for the 241Am extraction. The occurrence of a 1:1 complex of americium with silicic acid according to the reaction Am3+ + Si(OH)4 ↔ AmOSi(OH)32+ + H+ could be demonstrated and a formation constant of K1 = (6.9±0.7)×10-3 [log K1 = -2.16±0.04] at I = 0.2 M was calculated.
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Articles in the same Issue
- Formation of americium(III) complexes with aqueous silicic acid
- The reduction of plutonium and neptunium ions by acetaldoxime in nitric acid
- Complex formation of U(VI) with Bacillus-isolates from a uranium mining waste pile
- Longterm leaching of natural radionuclides from uranium mill tailings material: comparison of indoor and outdoor column experiments
- Enrichment analysis of uranium in uranium oxide by gamma-ray spectrometry without using calibration standards
- Gas phase chemistry of technetium and rhenium oxychlorides
- Synthesis and chromatographic characterization of [Tc-99m]technetium-humic acid species
- Retention of some hazardous radionuclides from nitric acid solution using tin(IV) antimonate as a cation exchanger
- Study of adsorption of zinc ions on hydrous zirconium oxide surface
- Radiometric analysis of the spent fuel pool water and reactor coolant of ET-RR.1
- Separation of carrier-free cerium radionuclides from different target matrix produced by heavy ion beams
