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矿石中少量铀和钍一般采用分别比色测定的方法,但同时测定铀、钍显得操作冗长。本文在前人工作基础上,采用三辛基氧膦(TOPO)作为萃取剂,在2N硝酸介质中同时萃取铀和钍,使之与大量稀土和铁等伴生元素分离。此时,锆也被萃取,并严重干扰钍的测定,但可借助磷钇矿中大量磷酸根,在浓度大的酸溶液中使锆成磷酸锆沉淀而除去。铀钍萃取液用乙醇使之与水互溶,以常用的显色剂直接进行分光测定。本法与其它方法对照,结果吻合,相对标准偏差不超过5%。方法简便、快速。试剂:缓冲液—200毫升三乙醇胺与600毫升水混匀,用高氯酸调至pH8～8.3,加水至1升;混合掩蔽剂—取5克氟化钠,34.6克CyDTA及40克磺
A small amount of uranium and thorium in the ore are generally used for colorimetric determination of the method, but the simultaneous determination of uranium, thorium appears lengthy operation. Based on the previous work, trioctylphosphine oxide (TOPO) was used as extractant to simultaneously extract uranium and thorium in 2N nitric acid medium and separate it from a large amount of accompanying elements such as rare earth and iron. At this point, zirconium is also extracted and severely interferes with the determination of thorium but can be removed by precipitation of zirconium phosphate into zirconium phosphate in a large concentration of acid solution by means of a large amount of phosphate in the xenotime. Uranium thorium extract with ethanol to make it miscible with water, commonly used color reagent direct spectrophotometry. This Law and other methods of control, the results match, the relative standard deviation of not more than 5%. The method is simple and fast. Reagents: Buffer - 200 ml Triethanolamine and 600 ml of water were mixed, adjusted to pH8 ~ 8.3 with perchloric acid, add water to 1 liter; mixed masking agent - Take 5 grams of sodium fluoride, 34.6 grams of CyDTA and 40 grams of sulfonated