Abstract: P_(507) Extraction Chromatographic Separation-Spark Source Mass Spectrometric Determination of 14 Rare Earth Impurities in High Purity Erbium OxideSui Xiyun;Wang Zishu; Song Jiewei;Liang Yujun (Changchun institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)Abstract:The separation of rare earth impurities in high purity erbium oxide have been carried out with P507 extration chromatography. Hydrochloric acid-Ammonium chloride serves as eluant.The method of preconcentration and the determination condition of spark source mass spectrometry (SSMS) have been selected. The measured purity of erdium oxide is up to 99. 9999%.Keywords:high purity rare earth, trace analysis, SSMS