离子交换分离5′-硝基水杨基荧光酮—CTMAB分光光度法测定稀土矿中的微量钍  

Spectrophotometric Determination of Microamount of Thorium in Sample Rare Earth Ores with 5′-Nitrosalicylfluorone by Ion-exchange Separation

作　　者：白乌云[1] 赛音[1] 李胜[1] 

机构地区：[1]内蒙古大学化学化工学院化工系,内蒙古呼和浩特010021

出　　处：《稀土》2003年第3期56-58,共3页Chinese Rare Earths

基　　金：内蒙古自然科学基金资助项目(990301)

摘　　要：在表面活性剂CTMAB存在下,在pH9.8～10.2NH4Cl-NH3·H2O缓冲体系中,钍( )与5′-硝基水杨基荧光酮(5′-NSF)形成紫红色多元配合物,其最大吸收波长在570nm,表观摩尔吸光系数ε为1.89×105L·mol-1·cm-1,钍含量在0～40μg·(25mL)-1范围内符合比耳定律。经离子交换分离除去干扰离子,用本法测定了稀土精矿和寻乌矿中的微量钍,结果满意。A method for the determination of thorium reacting with 5′-nitrosalicylfluorone and cetyltrimethyl ammonium bromide(CTMAB) is proposed This method is based on the formation of a red-violet colored multicomponent complex in pH=98~102The complex has an absorption maximum at 570nm and its molar absorptivity is 189×105 L·mol-1·cm-1 The Beer's Law is obeyed in the concentration range of 0~40μg·(25mL)-1 for Th(Ⅳ)All interfering ions can be removed by eluting with 6mol·L-1 HCl through cation-exchange resin This method has been used for the determination of Th in sample rare earth ores with satisfactory results

关 键 词：钍 5′-硝基水杨基荧光酮 离子交换分离 

分 类 号：O657.32[理学—分析化学]