异烷基膦酸1-甲庚基酯负载树脂分离原子吸收光谱法测定氧化钇中痕量铕铽铒和镱

Separation of Trace Amounts of Eu,Tb,Er and Yb in Yttrium Oxide with 1-Methylheptyl Iso-alkyl Phosphonate and their Subsequent AAS Determinations

异烷基膦酸1-甲庚基酯(代号5712)是在较低酸度下具有优良稀土分离性能的萃取剂。本文测定了15种稀土(Ⅲ)在5712-负载树脂与不同浓度的HNO_3之间的分配比。研究了5712-负载树脂柱分离Y、Tb、Dy、Ho、Er的最优条件。0.58mol/L HNO_3可使这5种元素分离良好。利用5712-负载树脂分离和富集高纯氧化钇中痕量Eu、Tb、Er和Yb,然后再以原子吸收光谱法测定。经过本法分离和富集,除去了大量基体,从而提高了测定的灵敏度。

1-Methylheptyl iso-alkylphosphonate (designated as 5712) is one of the best extractants for the separation of rare earths (REs)from one another. This paper reports the distribution ratio of 15 REs (Ⅲ) between 5712-loaded resin (LR) and various concentrations of nitric acid. The optimum conditions for the separation of Y, Tb, Dy, Ho and Er with 5712-LR were investigated. Good separations of these five REs are achieved with 0. 58mol/L nitric acid as eluent. It is feasible to enrich traces of Eu,Tb,Er and Ybin high-purity yttrium oxide with 5712-LR. The removal of large amounts of matrix favors the determination of the traces with AAS.