作者：邓起鸿
作者单位：四川核工业地质局分析测试中心, 四川 成都 610503
关键词：激光(紫外)荧光法; 铀; 碳质灰岩; 含碳硅岩; MUA型微量铀分析仪
摘要：
针对某矿区含碳硅岩和碳质灰岩样品的铀分析应用标准方法分析过程复杂、分析结果不够准确的状况,采用激光荧光法,实验一种快速准确的分析方法。通过马弗炉灼烧和硝酸-氢氟酸-高氯酸冷浸湿法预处理,在一定的硝酸介质中铀酰离子与荧光增强剂生成稳定络合物,在激光激发下产生荧光。使用MUA型微量铀分析仪可直接用标准加入法测定样品中铀的含量。探讨了样品分解、酸度、灵敏度对不同铀含量样品的测定条件的影响。初步形成一种广含量的铀的可靠分析方法,从而提高了分析效率和准确度,并降低了分析成本。
Determination of uranium in ampelitic limestone and carbonaceous quartzite from certain mining area
DENG Qi-hong
Testing and Analysis Center of Sichuan Geological Bureau of Nuclear Industry, Chengdu 610503, China
Abstract: In order to overcome the shortcomings encountered in using standard methods for uranium determination, a laser-induecd fluorescence detection method was proposed for carbon-silicon limestone and carbon samples collected from tested mining area. The samples were handled by burning in muffle furnace and then treated with cold nitric acid-hydrofluoric acid-perchloric acid system. The result uranyl ions can form stable complex with certain fluorescence enhancer in a nitric acid solution and the complex emits fluorescence under laser excitation. Using this method and MUA-type trace uranium analyzer, the content of uranium in the sample can be determined with the standard addition method. The parameters, such as sample decomposition conditions and acidity, affecting the determination were investigated. The results suggest that the method is rapid, accurate and cost-effective, and can be used for uranium determination in practical samples with a wide linear range.
Keywords: Laser(UV)-induced fluorescence; Uranium; Ampelitic limestone; Carbonaceous quartzite; MUA micro-quantity of uranium analyzer
2010, 36(2): 44-46 收稿日期: 2009-8-19;收到修改稿日期: 2009-11-6
基金项目:
作者简介: 邓起鸿(1983-),男,四川成都市人,助工,主要从事分析检测工作。
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