The possibility of rare earth elements (REE) separation by ion interaction chromatography (IIC) employing their complexes with diglycolic acid (ODA) in anion exchange mode has been studied theoretically and experimentally. Calculations, assuming that only trivalent complex is significantly uptaken by the stationary phase, indicated that at at pH 4–6, the retention in the lanthanide series should increase from La to the Tb–Dy–Ho region with yttrium showing apparent atomic number (App.At.No.) of 67½ and then decrease with further increase of atomic number. Chromatographic experiments in the system: Column: Eternity C₁₈—mobile phase 5 mM ODA/8.6 mM TBAOH/0.6 mM HNO₃; pH 4.60 confirmed theoretically predictions. It was found that scandium at pH ≥ 4.0 elutes in front of the whole REE group but at low pH enters the region of light lanthanides. The non-monotonical change of affinity of the REE with the increase of atomic number results in quite unusual order of elution of REE namely: Sc < La < Ce < Lu < Pr < Yb < Nd < Tm < Sm < Eu < Er≈Y < Gd < Ho < Tb≈Dy.

从理论上和实验上研究了通过离子相互作用色谱法（IIC）将其与二乙醇酸（ODA）配合使用的稀土元素（REE）分离阴离子的可能性。计算（假设只有三价络合物被固定相显着吸收）表明，在pH值为4-6时，镧系元素的保留量应从La增加到Tb-Dy-Ho区，钇表现出明显的原子序数（App （原子序数）为67½，然后随着原子序数的进一步增加而降低。系统中的色谱实验：色谱柱：Eternal C _18-流动相5 mM ODA / 8.6 mM TBAOH / 0.6 mM HNO ₃; pH 4.60证实了理论上的预测。已发现，pH≥4.0的scan在整个REE组之前洗脱，但在低pH时进入轻镧系元素区域。稀土元素亲和力的非单调变化随原子序数的增加而导致稀土元素的洗脱顺序非常不同，即：Sc <La <Ce <Lu <Pr <Yb <Nd <Tm <Sm <Eu <Er≈Y <Gd <Ho <Tb≈Dy。