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本文应用高效液相色谱法．在C18反相柱上，以0．25mol／L乳酸作流动相，采取pH梯度．对16个稀土元素进行分离。除Dy－Y和Gd－Eu两对未完全分离外．其余稀土在55min全部洗脱达到分离、对完全分开的稀土元素，采用内标法同时定量测定．而两对元素Dy－Y和Gd－Eu采用铁消因子分析方法，进行了定量计算，取得了满意的结果。
This application of high performance liquid chromatography. On a C18 reverse phase column, 0.25 mol / L lactic acid was used as the mobile phase and a pH gradient was used. 16 rare earth elements were separated. In addition to Dy-Y and Gd-Eu two pairs of incomplete separation. The rest of the rare earth eluted in 55min to achieve full separation of completely separated rare earth elements, using internal standard method simultaneously quantitative determination. The two pairs of elements, Dy-Y and Gd-Eu, were quantitatively calculated by the iron-vanishing factor analysis method and satisfactory results were obtained.