用5-Br-PADAP比色法测定高铁、高硝酸根体系中的低含量铀  

Application of 5-Br-PADAP Colorimetric Method in the Determination of Low Content Uranium in High Iron and High Nitrate Solutions

作　　者：曹欣然 程晨 周丽彬[1] CAO Xinran;CHENG Chen;ZHOU Libin(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China;Agriculture and Rural Bureau of Anguo,Baoding 071200,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149 [2]安国市农业农村局,河北保定071200

出　　处：《铀矿冶》2025年第1期71-77,共7页Uranium Mining and Metallurgy

基　　金：核工业北京化工冶金研究院院长基金。

摘　　要：为了消除高铁、高硝酸根对5-Br-PADAP比色法测定低含量铀的影响,研究了高铁、高硝酸根、低铀含量溶液的预处理方式。结果表明:以4%TOPO-环己烷溶液为萃取剂,在有机相与水相体积比1∶6、萃取时间2 min、萃取温度25℃、以混合配合剂为反萃取剂的预处理条件下,萃取率达99.0%,反萃取率为99.0%。对高铁、高硝酸根、低铀含量溶液进行萃取—反萃取后,采用5-Br-PADAP比色法能够准确测定预处理后溶液中铀的含量。该方法的相对标准偏差小于8.11%,加标回收率为96.0%~99.5%,方法检出限为0.013 mg/L。This article studies the pretreatment methods of solutions with high iron content,high nitrate content,and low uranium content.The results show that under the pretreatment conditions of using 4%TOPO cyclohexane solution as the extractant,a volume ratio of organic phase to water phase of 1:6,an extraction time of 2 minutes,an extraction temperature of 25℃,and a mixed complexing agent as the counter extractant,the extraction efficiency reached 99.0%,and the counter extraction efficiency was 99.0%.The 5-Br-PADAP colorimetric method can accurately determine the uranium content in the pretreated solution after extraction reverse extraction of high iron,high nitrate,and low uranium content solutions.The relative standard deviation of this method is less than 8.11%,the recovery rate of spiking is 96.0%~99.5%,and the detection limit of this method is 0.013 mg/L.

关 键 词：高铁 高硝酸根 低含量铀 预处理 萃取 反萃取 5-Br-PADAP比色法 

分 类 号：TL271[核科学技术—核燃料循环与材料] O661[理学—分析化学]