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本文研究了同时测定硅酸盐岩石中钍、锆和铀的色层-分光光度方法。用 HCIO_4-HF 混合酸分解样品后,用 Fe(OH)_3和 AI(OH)_3将钍、铀和锆共沉淀。再从含有 H_2O_2的稀硫酸介质中,将它们吸附到DOWEX1阴离子交换柱上。被吸附的锆、铀、钍分别用酸性硫酸铵溶液、盐酸、高氯酸洗提而使之分离。自硫酸盐介质中吸附,接着洗提,可选择性分离钍、锆和铀,从而能直接用偶氮胂Ⅲ进行分光光度法测定。本文也列出了美国和日本地质调查所标准岩石中钍、锆和铀的测定结果。
In this paper, the chromatographic-spectrophotometric method for simultaneous determination of thorium, zirconium and uranium in silicate rocks was studied. Thorium, uranium and zirconium were coprecipitated with Fe (OH) _3 and AI (OH) _3 after the sample was decomposed with HCI04-HF mixed acid. Then from H 2 O 2 -containing dilute sulfuric acid medium, they were adsorbed to DOWEX 1 anion exchange column. Adsorbed zirconium, uranium, thorium, respectively, with acidic ammonium sulfate solution, hydrochloric acid, perchloric acid and separation. Since the sulfate medium adsorption, followed by elution, selective separation of thorium, zirconium and uranium, which can be directly arsenazo Ⅲ spectrophotometric determination. This article also lists the results of measurements of thorium, zirconium and uranium in the standard rocks of the United States and Japan Geological Survey.