CL-TBP萃淋树脂分离和络合物吸附波测定八氧化三铀中的微量镍和钴  

SEPARATION AND CONCENTRATION OF NICKEL AND COBALT WITH CL-TBP EXTRACTANT-CONTAINING RESIN IN U_3O_8 AND ITS DETERMINATION BY ADSORPTION COMPLEX WAVE

作　　者：宋玉珍[1] 陈静兰[1] 

机构地区：[1]核工业北京化工冶金研究院,101149

出　　处：《铀矿冶》1992年第2期56-59,共4页Uranium Mining and Metallurgy

摘　　要：试样预先经CL-TBP萃淋树脂分离大量的铀后,在三乙醇胺-氯化铵介质中,Ni(Ⅱ)和Co(Ⅱ)与了二酮肟形成络合物,分别于—1.05V和—1.30V(相对饱和甘汞电极)处产生灵敏的络合物吸附波。确定的最佳底液条件是0.2mol/L三乙醇胺-0.5mol/L氯化铵-0.02％丁二酮肟,pH为9.27,测定浓度范围Ni(Ⅱ)是0.002—0.1μS/ml,Co(Ⅱ)是0.003—0.1μS/ml。方法适用于八氧化三铀中微量Ni和Co的同时测定,精密度分别为±3.5％和±6.3％,加入回收分别为93％—105％和10％—96％。A simple and sensitive method has been proposed for the determination of Ni(Ⅱ) and Co(Ⅱ) in U3O8. As a result of the formation of electroactive complexes by the reaction of Ni(Ⅱ) and Co(Ⅱ) with diacetylaioxime in a suitable supporting electrolyte of 0. 2 mol/L triethanolamine,0. 5 mol/L ammonium muriate and 0. 02% diacetylaioxime,a sensitive adsorption wave appeared with peak patentials of Ni(Ⅱ) - 1. 05V and Co(Ⅱ) - 1. 30V (vs. S. C. E. ). The height of the adsorption wave was recti-linearly related to the concentration of Ni(Ⅱ) in the range 0. 002-0. 1 g/ml and Co(Ⅱ) in the range 0. 003 - 0. 1 g/ml. The separation of Ni(Ⅱ) and Co(Ⅱ) was carried out with CL-TBP extractant-containing resin. The precisions of the method for determination of Ni(Ⅱ) and Co(Ⅱ) were 3. 5% and 6. 3% respectively. The rates of recovery were 93-105% and 90 - 96% for Ni(Ⅱ) and Co (Ⅱ) respectively.

关 键 词：八氧化三铀 络合物 吸附波 镍 钴 

分 类 号：O614.62[理学—无机化学]