重稀土三元络合物的β型显色体系的研究

Study on the β-Type Color System of Ternary Complex of Heavy Rare Earths

在盐酸—醋酸钠介质中,重稀土与对氯偶氮氯膦和钼酸钠形成β型三元络合物,于755nm波长处有最大吸收。络合物在30分钟内完全形成,可以稳定3小时。标准曲线的线性范围:0—20微克重稀土/25毫升。用于光度法测定龙南稀土矿中钇基重稀土含量。方法灵敏、快速,结果准确。

In hydrochloric acid-sodium acetate mix solution,heavy Rare Earths with P-Cl-Chlorphosphonazo and sodium molybdate to form aβ-type ternary complex,having an absorption maximum at 755 nm.The complex formation was stable at 3h,Linear range for calibration curve was O-20μg of heavy RE in 25ml of solution.A sensitive and rapidly procedure for the spectrop- hotometric determination of Yttrium subgroup Rare Earths in the Longnan Rare Earths rock is described.