【摘要】 本文介绍一种铀、钍、镭的联合测定法,并测定了一批食品样品,样品中的铀含量和用荧光法测定的结果进行了对比。该法程序包括:样品准备,铀和钍共沉淀浓集,N-235共萃取,7mol/L HCl 反萃取钍后,再用水反萃取铀。铀和钍均用铀试剂Ⅲ显色,差减法分光光度分别测定。合并共沉淀、萃取铀钍及洗涤的残留溶液,用铅钡硫酸盐共沉淀分离-α计数法测定总镭含量。更多还原

【Abstract】 This paper describes a method of simultaneous determination of U,Th and Ra.The method has been applied to the determination of the background in some food.The process is as follow:Sample preparation,U and Th concentration by coprecipitation with hydroxides and by coextraction with N-235 Then U and Th were stripped With 7 mol/L HCl solution and water respectively,which determined spectrophometrically with arsenazo Ⅲ.The aqueous solution of coprecipitation and coextraction were collected for determina- tion of total Ra content.更多还原