CAPILLARY ZONE ELECTROPHORETIC (CZE) STUDY OF URANIUM(VI) COMPLEXATION WITH HUMIC ACIDS
| Authors | |
|---|---|
| Year of publication | 2001 |
| Type | Article in Periodical |
| Magazine / Source | J. Radioanal. Nuclear Chemistry |
| MU Faculty or unit | |
| Citation | |
| Field | Analytic chemistry |
| Description | The interaction of UO22+ with various humic acids (HA's) has been studied by capillary zone electrophoresis (CZE). The experiments were done in 10 mM acetate buffer with pH 3.3 and 4.0, to avoid hydrolysis of uranium. It was found that in slightly acidic media and low HA concentration (<3 mM), two complexes with uranium (VI) are formed by fast kinetics and uranyl migrates as cationic species. Electrophoreic mobilities are decreasing with the increasing HA/uranium ratio and a low soluble neutral compound is also formed. In addition, it was found that at HA concentrations higher than 3 mM negatively charged species are formed. Similar results were obtained for HA's of different origin (soil, peat, coal derived, IHSS standards). Conditional stability constants of the complexes UO22+-HA for Fluka IHA, were estimated to be log beta1=4.18+-0.06 and log beta2=7.28+-0.18. |
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