ICP-MS法测定地矿样品中高低含量稀土元素

Determination of Rare Earth Elements with High and Low Contents in the Mineral Samples by ICP-MS

针对地矿样品中的不同含量的稀土元素测定,本文采用两种前处理方式:敞开酸溶和碱熔法,通过选择合适的内标元素和测定同位素后经ICP-MS进行准确测定。酸溶法采用加入1毫升硫酸以达到样品完全分解的目的。对于稀土含量不高的样品,酸溶法的检出限在0.02g/g～0.3g/g之间,相对偏差在5%以内,相对标准偏差在1.99%～5.05%之间。对于高含量稀土矿石样品,碱熔法的结果优于酸溶法。

In view of the determination of high and low rare-earth elements in mineral samples, this paper uses two kinds of pretreatment methods： open acid solution and alkali fusion method. By selecting appropriate internal standard elements and measuring isotopes, the results can be measured accurately by ICP-MS. The sample can be completely decomposed by adding 1 ml of sulfuric acid in Acid soluble. For samples with low rare-earth content, acid solution was appropriate ,because it＇s detection limit was （0.02～0.3） g/g and relative deviation was within 5% and relative standard deviation is between 1.99% ～5.05%. For high content rare earth ore samples, the result of alkali fusion is better than that of acid dissolution.