Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1168853 | Analytica Chimica Acta | 2008 | 8 Pages |
Abstract
This work proposes a new procedure for on-line electro-oxidative leaching and spectrophotometric determination of uranium in ore samples. By associating a conventional flow injection system, used for uranium determination with Arsenazo III, with an on-line system for electro-oxidative leaching, a fully integrated system was assembled. The systems were integrated after achieving optimum conditions for uranium determination and leaching. According to the results obtained in the present work, a current density of 280 mA cmâ2 generated enough hypochlorite ions in the electrolyte solution (3.6 mol Lâ1 HCl + 2% (w/v) NaCl) to promote quantitative oxidation of U(IV) to U(VI) thus improving the extraction efficiency. The slurry density did not significantly affect the performance of the system and the increasing temperature resulted in a decrease in extraction efficiency. This methodology was applied in the determination of U3O8 in four ore samples and the results obtained agreed with those obtained by ICP-MS after conventional wet acid digestion of the samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Álvaro Serafim F. de Sousa, Elizabeth M.M. Ferreira, Ricardo J. Cassella,