| 恒电流库仑法测定八氧化三铀中的铀 |
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| 引用本文： | 牟凌,汪南杰,叶卫华,覃波. 恒电流库仑法测定八氧化三铀中的铀[J]. 核化学与放射化学, 2006, 28(1): 49-54 |
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| 作者姓名： | 牟凌 汪南杰 叶卫华 覃波 |
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| 作者单位： | 兰州核燃料厂,兰州,732850;兰州核燃料厂,兰州,732850;兰州核燃料厂,兰州,732850;兰州核燃料厂,兰州,732850 |
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| 摘 要： | 为了对铀产品中的铀含量进行准确定值，建立了用恒电流库仑法测定八氧化三铀中铀的方法。用Fe（Ⅱ）在磷酸介质中还原U（Ⅵ）为U（Ⅳ），用钼作催化剂，用硝酸选择性地氧化过剩的Fe（Ⅱ）后加入略超过铀化学当量的重铬酸钾，把U（Ⅳ）氧化到U（Ⅵ），过量的重铬酸钾用恒电流产生的Fe（Ⅱ）滴定。对250mg八氧化三铀，精密度优于0.015%。
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| 关 键 词： | 磷酸 氧化 还原 恒电流库仑 |
| 文章编号： | 0253-9950（2006）01-0049-07 |
| 收稿时间： | 2005-10-27 |
| 修稿时间： | 2005-10-272005-12-01 |
Constant Current Coulometric Determination of Uranium in U3O8 |
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| MU Ling,WANG Nan-jie,YE Wei-hua,QIN Bo. Constant Current Coulometric Determination of Uranium in U3O8[J]. Journal of Nuclear and Radiochemistry, 2006, 28(1): 49-54 |
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| Authors: | MU Ling WANG Nan-jie YE Wei-hua QIN Bo |
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| Affiliation: | Nuclear Fuel Plant of Lanzhou, Lanzhou 732850, China |
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| Abstract: | Constant current coulometric is established to determine uranium in U3O8 in order to correct determination of uranium in uranium product. U(Ⅵ) is reduced to U(Ⅳ) by Fe(Ⅱ) in phosphoric acid. Molybdenum is used as catalyzer, the excess Fe(Ⅱ) is oxidized by nitric acid selectively.The U(Ⅳ) is oxided to U(Ⅵ) by adding chromium(Ⅵ) that is slightly more than uranium’s chemical equivalent in sample solution.The excess chromium(Ⅵ) is titrated by Fe(Ⅱ) which is produced through constant current. The precision is better than 0.015% for 250mg U3O8. |
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| Keywords: | phosphoric acid oxide reduce constant current coulometric |
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