分光光度法测定三氧化铀中的硫酸根

Determination of Sulfate in Uranium Trioxide by Spectrophotometry

采用TBP-萃淋树脂吸附三氧化铀样品中的铀,硫酸根与铬酸钡进行交换反应后,直接比色法测定硫酸根的含量。实验中研究了三氧化铀样品中硫酸根含量测定的样品制备、分离、反应酸度,煮沸时间,铬酸钡用量等影响因素。优化条件下,采用硝酸(5mol/L)淋洗、1mL HCl溶液(2.5mol/L)调节溶液中酸浓度、使用2mL BaCrO_4进行交换反应、煮沸3min,得到方法相对标准偏差小于10%,加标回收率为92.9%～110%。实验结果表明,直接显色的测定方法灵敏、快速、准确度高。方法测定条件易于获得,适于推广应用。

The uranium in uranium trioxide sample was adsorbed by TBP resin, after the sulfate was exchanged with barium chromate, the content of sulfate was determined directly by colorimetry. The influence factors on the determination of sulfate in uranium trioxide were studied, including the preparation, separation, reaction acidity, boiling time and the amount of barium chromate. Under the optimal conditions, rinsed by 5 mol/L nitric acid, adjust solution acidity by 1 mL 2.5 mol/L HCl solution, exchanged reaction by 2 mL BaCrO 4 and boiled 3 minutes. The relative standard deviation of the method was less than 10%, and the standard recovery was 92.9%-110%. Experimental results show that the method is sensitive, rapid and accurate. The determination conditions are easy to obtain, and the method is suitable for promotion application.