采用电感耦合等离子体质谱法测定离子型稀土矿中钪、钇、镧、铈、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥等16种离子吸附型稀土元素的含量。采用40 g·L-1硫酸铵溶液对离子型稀土矿样品进行了间歇式搅拌浸出,对浸出液进行两次高温蒸干处理去除盐分。钪、钇、镧、铈以103Rh为内标,其他元素以187Re为内标。16种稀土元素在一定的质量分数范围内与其光谱强度呈线性关系,方法的检出限(3σ)在0.01~0.08 μg·g-1之间。方法应用于离子型稀土矿样品的分析,测定值与国家标准方法测定结果相符,测定值的相对标准偏差(n=11)在0.80%~2.9%之间。

ICP-MS was applied to the determination of 16 ionic adsorptive rare earth elements, i.e. Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in ionic rare earth ores. The sample of ionic rare earth (RE) ore was leached with 40 g·L-1 (NH4)2SO4 solution by intermittent stirring. The leachate obtained was desalted twice by evaporation to dryness at high temperature. 103Rh was used as internal standard for Sc, Y, La and Ce, while 187Re was used as internal standard for the remainders in ICP-MS. Linear relationships between values of spectral intensity and mass concentration of the 16 RE elements were kept in definite ranges. Detection limits (3σ) found were in the range of 0.01-0.08 μg·g-1. The proposed method was used in the analysis of substantial ore sample, giving results in consistency with the values obtained by the GB method, and values of RSD′s (n=11) were found in the range of 0.80%-2.9%.