CL-TBP萃淋树脂分离富集——全差示光度法测定含铀废水中微量钍  

FULLY-DIFFERENTIAL SPECTROPHOTOMETRY DETERMINATION OF TRACE THORIUM IN URANIUM-CONTAINING WASTE WATER SEPARATED BY CL-TBP LEVEXTREL RESIN

作　　者：游建南[1] 

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》2000年第2期116-121,共6页Uranium Mining and Metallurgy

摘　　要：在 4mol/ L 硝酸介质中 ,在酒石酸存在下 ,用 CL- TBP萃淋树脂吸附钍 ,再用 4mol/ L 盐酸解吸 ,在草酸、尿素掩蔽下 ,钍与偶氮胂 形成稳定的红色络合物。络合物最大吸收波长 6 6 8nm,可稳定 2 .5 h。摩尔吸光系数达 1 .2 7× 1 0 5 L / (mol· cm )。在全差示分光光度计上 ,调节不同参数的微电流 ,实现了高精度的测量。本法比普通光度法灵敏度提高 1 0倍 ,方法精密度优于± 5 % ,回收率99.0 %～ 1 0 6 %。In the present paper,a method for separation by CL TBP levextrel resin and determination of trace thorium in uranium containing waste water by fully differential spectrophotometry is developed.In 4 mol/L HNO 3 medium,in presence of tartaric acid,CL TBP levextrel resin is used for adsorpting of thorium and separating from other elements.The thorium on the resin is stripped by 4 mol/L HCl,with oxalic acid and urea as screening agent,thorium forms red complex with arsenazo Ⅲ.The maximum absorption of the complex is at 668 nm,and the molar absorptivity is 1.27×10 5 L/(mol·cm).The complex can be steady for 2.5 h.By regulating micro current of differential spectrophotometry,the method can realize determination with high precision.Sensitivity of this method increases 10 times than usual spectrophotometry.The relative standard deviation is better than±5% and recovery of thorium is 99%~107%.By regulating micro- current of differential spectrophotometry,the method can realize deter-mination with high precision.Sensitivity of this method increases1 0 times than usual spec-trophotometry.The relative standard devi

关 键 词：萃淋树脂 钍 全差示光度法 铀废水 

分 类 号：TL271.4[核科学技术—核燃料循环与材料]