萃余水相中酸和铀的连续测量方法  

Continuous Measurement Method of Acid and Uranium in the Raffinate Phase

作　　者：陈强[1] 董彦霞 张慧妍[1] 王扬[1] 陈福平[1] CHEN Qiang;DONG Yanxia;ZHANG Huiyan;WANG Yang;CHEN Fuping(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《铀矿冶》2024年第3期56-62,共7页Uranium Mining and Metallurgy

摘　　要：萃余水相中的酸浓度、铀浓度一般需分开检测,操作步骤繁琐,工作量大。本研究建立了连续测量萃余水相中酸浓度和铀浓度的新方法:先以强碱为滴定剂,通过指示剂的变色指示滴定终点,检测酸浓度;再加入硫酸和偶氮胂Ⅲ溶液,使溶液显色,在650 nm处测量显色溶液的吸光度。结果显示,酸浓度测量的精密度为1.53%,示值误差为1.69%;铀质量浓度测量精密度为1.13%,示值误差为1.52%。在实际水样测量中,本方法和实验室现行方法测量数据基本一致,酸浓度测量的加标回收率为97.0%~102.5%,铀质量浓度测量的加标回收率为97.0%~102.0%,本方法可准确、快速、连续监测萃余水相中的酸浓度和铀浓度。Acid concentration and uranium concentration in raffinate phase generally need to be measured separately,which is cumbersome and requires a large amount of work.A new method for continuous measurement of acid concentration and uranium concentration in raffinate phase was developed.A strong base was used as titration agent,the color change of the indicator was selected to indicate the titration endpoint.After completing the acid concentration detection,the sulfuric acid and arsenazo III solutions with a certain amount and concentration were added to the above solution to make the solution color,and the absorbance of the color solution was measured at 650 nm.The results show that the precision of measuring acid concentration and uranium concentration is 1.53%and 1.13%respectively,the indication error for measuring acid concentration and uranium concentration is 1.69%and 1.52%respectively.For the measurement of actual water samples,the measurement data of this method is basically consistent with that of the laboratory current methods,the recovery rate of acid concentration measurement is between 97.0%and 102.5%,and the recovery rate of uranium concentration measurement is between 97.0%and 102.0%.The method is suitable for continuous monitoring of acid concentration and uranium concentration in raffinate phase and has accurate and fast characteristics.

关 键 词：萃余水相 铀 余酸 酸碱滴定法 偶氮胂Ⅲ分光光度法 连续测量 

分 类 号：O657[理学—分析化学] TL212[理学—化学]