产品八氧化三铀分析方法的优化  

Optimization of the analysis method for triuranium octaoxide

作　　者：孙元方 Sun Yuanfang(CGN Swakop Uranium(Pty)Ltd.,Huangshan 245041,China)

机构地区：[1]中广核铀业斯科有限公司湖山铀矿水冶厂实验室,纳米比亚埃龙戈省斯瓦克蒙德市

出　　处：《分析仪器》2021年第2期112-115,共4页Analytical Instrumentation

摘　　要：U3O8产品质量的好坏将直接影响到公司的经济效益,因此产品含量分析结果是否准确尤为重要。建立硫酸亚铁还原-重铬酸钾法测定产品U_(3)O_(8),通过优化产品八氧化三铀混匀程序,改善了样品的粒度和均匀度;延长样品的干燥时间,可减少因水分影响带来的分析误差;通过实验确定了能进行氧化还原反应所需的磷酸量及磷酸的最低加入量,降低了样品分析成本;方法经标准物质和内部监控样验证,分析结果与标准参考值一致。优化后,八氧化三铀产品含量分析结果的合格率从27.8%提高到90.0%。The assay could be carried out by reducing the ferrous sulfate and using a standard solution of potassium dichromate.By optimizing U_(3)O_(8) sample mixing procedure,the particle size and uniformity were enhanced.Prolonging the drying time of the sample could reduce the analysis error caused by the influence of moisture.The minimum amount of phosphoric acid for redox reaction were determined by experiments,which reduced the cost of sample analysis.The titration method was verified by reference materials and internal monitoring samples,and the analytical results were consistent with the reference values.By the optimized titration analysis method,the passing rate of U3O8 content analysis results increased from 27.8%to 90%.

关 键 词：U3O8 氧化还原反应 方法优化 质量控制 不确定度评定 合格率 

分 类 号：TL34[核科学技术—核技术及应用]