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用偶氮氯膦Ⅲ在磷酸介质中测定钍较盐酸介质测定选择性好,文献早有报道,但因稀土和铀仍有严重干扰,在矿石分析中未见推广使用。我们根据偶氮氯膦Ⅲ和钍、铀皆能生成有色配合物的这一性质,对偶氮氯膦Ⅲ和钍、铀在磷酸体系中的显色行为作了研究,提出以TRPO-GDX-301萃取色层分离稀土、钛、锆等干扰元素,用双波长分光光度法同时测定铀矿石中钍和铀的方法。样品考核结果表明,本法操作简便,省力省物,测定矿石中0.0X—0.X％的钍和铀时,相对标准偏差约为5％,准确度良好。
Determination of chlorophosphonazo III in phosphoric acid medium has better selectivity than hydrochloride medium. It has long been reported in the literature, but rare earths and uranium still have serious interference and no general application has been found in ore analysis. According to the properties of chlorophosphonazo Ⅲ, thorium and uranium all can produce colored complex, we studied the chromogenic behavior of chlorophosphonazo Ⅲ, thorium and uranium in phosphoric acid system, and proposed the method of using TRPO-GDX-301 Extraction chromatographic separation of rare earths, titanium, zirconium and other interfering elements, simultaneous determination of thorium and uranium in uranium ores by dual-wavelength spectrophotometry. Sample test results show that this method is simple, labor-saving provinces, the determination of ore 0.0X-0.X% thorium and uranium, the relative standard deviation of about 5%, with good accuracy.