【摘要】 本工作采用体积比1∶1浓硝酸和过氧化氢(φ=30%)加热溶解四氟化铀(UF4)后,再用浓硝酸或浓盐酸反复溶解蒸干,去除氟离子。在3mol/L硝酸介质中,采用15mm×105mm CL-TBP萃淋树脂柱分离铀中杂质,收集第6—15mL淋洗液,用等离子体发射光谱法(ICP-AES)进行测量。Al等22种元素回收率在97%~113%之间,除Al、Ca、Ba和Bi外其它元素相对标准偏差在5%以内(n=5)。在6mol/L盐酸介质中采用15mm×105mm CL-TBP萃淋树脂柱分离铀中Th,进行ICP-MS测量。Th回收率在91%~94%之间,相对标准偏差在5%以内(n=5),分析方法的检测下限为0.037μg/g(以UF4计)。更多还原

【Abstract】 A method for determination of thorium i.e 23 trace elements in UF4 is established.In this work,UF4 was dissolved by HNO3andφ=30% H2O2 with a volume ratio 1∶1,then evaporated to dry repeatedly for the removal of F-.By using a15mm×105mm CL-TBP column extraction chromatography,Al i.e 22 trace elements were separated with uranium in3mol/L HNO3,the sixth to fifteenth mL eluent were collected for determination by ICPAES.The recovery of these elements is between 97%-113%,and the relative standard deviation(sr)is better than 5%(n=5)unless Al,Ca,Ba and Bi.In 6 mol/L HCl,the uranium was separated by TBP levextred resin chromatography,and the thorium was determined by ICP-MS.The recovery of Th is between 91%-94%,and the sris within 5%(n=5),and the detection limit of this separation method is 0.037μg/g UF4.更多还原