کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1168853 1491169 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of an integrated flow injection system for the electro-oxidative leaching of uranium from geological samples and its spectrophotometric determination with Arsenazo III
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Development of an integrated flow injection system for the electro-oxidative leaching of uranium from geological samples and its spectrophotometric determination with Arsenazo III
چکیده انگلیسی
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 cm−2 generated enough hypochlorite ions in the electrolyte solution (3.6 mol L−1 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 620, Issues 1–2, 14 July 2008, Pages 89-96
نویسندگان
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