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AlexandratosS．D．等人合成了一种具有高容量的双官能团单膦酸／磺酸离子交换树脂，并用含有铕、钐和不同酸度的硝酸铁溶液，在加或不加硝酸钠的条件下，对这种树脂络合金属离子的能力进行了研究。从0．5mol／L和1mol／L的硝酸溶液中络合Eu（Ⅲ）时，这种二官能团树脂的络合能
AlexandratosS. D. Et al. Synthesized a bifunctional monophosphonic acid / sulfonic acid ion exchange resin having a high capacity and treated this solution with europium, samarium and ferric nitrate solutions of different acidity with or without sodium nitrate The ability to complex metal ions has been studied. When complexing Eu (Ⅲ) with 0.5 mol / L and 1 mol / L nitric acid solution, the complex energy of the difunctional resin