论文部分内容阅读
A new method for the determination of trace non rare earth elements (NREEs) impurities in high purity lanthanum oxide by HPLC combined with ICP AES is proposed. The chromatographic retention behaviors of matrix (La) and NREEs were studied using 2 ethylhexyl hydrogen 2 ethylhexyl phosphonate (P507) chelating resin as the stationary phase and dilute nitric acid as the mobile phase. It is found that the use of pH 1.7 nitric acid enables effective elution of NREEs from HPLC column, but the lanthanum remains on the column. The experimental results show that a favorable separation between matrix lanthanum and NREEs can be obtained within 15 min. The method proposed is applied to the determination of 8 NREEs impurities in high purity La 2O 3. The recoveries of 8 NREEs are in the range of 90%～110%.
A new method for the determination of trace non rare earth elements (NREEs) impurities in high purity lanthanum oxide by HPLC combined with ICP AES is proposed. The chromatographic retention behaviors of matrix (La) and NREEs were studied using 2 ethylhexyl hydrogen 2 ethylhexyl phosphonate (P507) chelating resin as the stationary phase and dilute nitric acid as the mobile phase. It is found that the use of pH 1.7 nitric acid enables effective elution of NREEs from HPLC column, but the lanthanum remains on the column. that a favorable separation between matrix lanthanum and NREEs can be obtained within 15 min. The method proposed is applied to the determination of 8 NREEs impurity in high purity La 2O 3. The recoveries of 8 NREEs are in the range of 90% to 110% .