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本文以反相萃取色层法分离,偶氮胂Ⅲ比色测定钍铀锆矿中微量总稀土。采用新型萃取剂DOSO 为固定相,0.2NNH_4SCN-1NHCl 为淋洗的移动相,取得了较好的分离效果。同时,还试验了其它干扰元素与稀土的分离及在硫氰化铵体系中显色等条件。对人工矿样和矿石的分析,结果令人满意。回收百分率波动于100～102%之间,相对误差为-4.4%～+6.7%。方法简便、快速,可用于矿石中微量稀土的测定。
In this paper, reversed-phase extraction chromatographic separation method, arsenazo Ⅲ colorimetric determination of trace amounts of total rare earth thorium uranium ore. The new extractant DOSO as the stationary phase, 0.2NNH_4SCN-1NHCl as the leaching mobile phase, and achieved a better separation. At the same time, we also tested the separation of other interference elements and rare earths and the conditions of color development in ammonium thiocyanate. Analysis of artificial ore samples and ores showed satisfactory results. The recovery percentage fluctuated between 100 and 102% with a relative error of -4.4% to + 6.7%. The method is simple, rapid and can be used for the determination of trace rare earths in ores.