砂岩型铀矿勘查样品中铀的野外快速测定方法研究

Study of on-the-spot rapid determination method of uranium in exploration samples from sandstone-type uranium deposits

本文研究并建立了适合野外条件下快速测定砂岩型铀矿勘查试样中铀的分析方法———密闭酸溶试样、钒酸铵容量法测定铀。采用密闭增压酸溶样, 可使粒度小于0 25 mm的试样分解完全;小体积容量法提高了测定灵敏度。配合不同浓度的标准溶液可适应不同含量范围铀的测定。方法经标准物质和吐哈工区试样验证, 准确度和精度较高, 且操作简单, 适应性广, 具有实用和推广价值。

An on-the-spot rapid determination method of uranium in exploration samples from sandstone-type uranium deposits has been developed——the dissolution of sample by acid in hermetic condition ,and the determination of uranium by ammonium vanadate volume method.Dissolution of sample by acid in hermetic overpressured condition can make the sample with grain size less than 0.25 mm completely disintegrated,and small volume method may elevate the determination sensitivity.The preparation of standard solution with various concentration may suit the determination of samples with large range of uranium content.The newly-developed method has been tested by standard reference material and samples from Turpan-Hami exploration district ,and it is verified that the method is of high accuracy and easily operable ,and widely applicable,and may be of great practical and popuralized significance.