Determination of Micro-Amount of Uranium in Ore by Microtitration with Reduction of Ammonium Vanadate by Titanous Chloride
详细信息
- 责任者：Xu Weidong (Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense ; East China Institute of Technology ; Fuzhou 344000 ; China) ; Sun Rong
- 刊名：Rock and Mineral Analysis
- 出版年：2010
- 卷期：29(3)
- 关键词：滴定法 ; titration methods ; 铀 ; uranium
- 页码：p.325-327
- 图表：1 illus., 5 tables, 16 refs.
- 分类号：0900
- issnNo：ISSN0254-5357
- isbnNo：CN11-2131/TD
摘要
Based on the titrimetry with reduction of ammonium vanadate by titanous chloride for the determination of micro-amount of uranium, some operation procedures in sample digestion, filtration and washing, reduction-oxidation and titration were improved. Samples were digested with H3PO4-HCl-H2O2 at low temperature. After centrifugation, filtering, reduction of UO22+ with Ti3+, oxidization of excessive Ti3+ by NaBrO3 and further oxidization of trace impurities with low valence by urea-NaNO3, uranium in the sample solution in a small volume（10 mL）was titrated with ammonium vanadate. The end point of the titration was very clear. Detection limit of the method for uranium was 0.001% and precision was 0.05% ～0.07%RSD (n=5). The method provides the advantages of simple operation, high efficiency and is suitable for the determination of 0.001%～0.01% uranium in ore and slag samples.