Effect of pH and uranium concentration on interaction of uranium(VI) and uranium(IV) with organic ligands in aqueous solutions
| Autor: | W. C. Li, D. M. Victor, C. L. Chakrabarti |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification Aqueous solution Inorganic chemistry technology industry and agriculture Ultrafiltration chemistry.chemical_element Uranium complex mixtures Chemical reaction Chloride Analytical Chemistry chemistry.chemical_compound chemistry Tannic acid medicine Humic acid Phenols Nuclear chemistry medicine.drug |
| Zdroj: | Analytical Chemistry. 52:520-523 |
| ISSN: | 1520-6882 0003-2700 |
| Popis: | The effect of pH and uranium concentration on the interactions of uranium(VI) and uranium(IV) with organic ligands was studied by employing dialysis and ultrafiltration techniques. The interactions of U(VI) and U(IV) with organic ligands in nitrate or chloride aqueous solution have been found to be pH-dependent. The stability constants of uranium-organic complexes decrease in the order: fulvic acid>humic acid>tannic acid for U(VI) and humic acid>tannic acid>fulvic acid for U(IV). Scatchard plots for the uranium-organic acid systems indicate two types of binding sites with a difference in stability constants of about 10/sup 2/. Ultrafiltration of uranium-humic acid complexes indicates that U(VI) and U(IV) ions are concentrated in larger molecular size fractions (>5.1 nm) at pH less than or equal to 3 and in smaller molecular size fractions (in the range 5.1 to 3.1 nm and 2.4 to 1.9 nm) at pH greater than or equal to 5. 7 figures, 4 tables. |
| Databáze: | OpenAIRE |
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