论文部分内容阅读
本文采用氧-氩气氛法光谱测定纯氧化镨中14个稀土元素杂质。在3.4米平面光栅摄谱仪负Ⅱ级(色散1.25埃/毫米)摄谱。对缓冲剂及相关分析条件进行了试验,选择了最佳条件,提高了测定稀土元素杂质的灵敏度,测定下限总和为285ppm。各个杂质的测定下限Y_2O_3、Er_2O_3、La_2O_3、Ho_2O_3、Gd_2O_3、Dy_2O_3和Sm_2O_3为10ppm;CeO_2、Nd_2O_3、Tb_4O_7和Lu_2O_3为50ppm;Tm_2O_3和Yb_2O_3为5ppm。准确度符合要求,变异系数13个杂质为4—18％,Tm_2O_3为6—24％。方法测定下限均低于国内外已发表的同类方法。本法适用于杂质含量大于285ppm的氧化镨的直接光谱测定。
In this paper, 14 rare earth elements impurities in pure praseodymium oxide were determined by Oxygen-Argon Atmospheric Spectrometry. In the 3.4 m plane grating spectrometer negative Ⅱ level (dispersion 1.25 / mm) spectroscopy. The buffer and related analytical conditions were tested and the best conditions were selected to improve the sensitivity of the determination of rare earth elements impurities, the lower limit of the total sum of 285ppm. The lower limit of determination of each impurity is 10ppm for Y_2O_3, Er_2O_3, La_2O_3, Ho_2O_3, Gd_2O_3, Dy_2O_3 and Sm_2O_3; 50ppm for CeO_2, Nd_2O_3, Tb_4O_7 and Lu_2O_3; 5ppm for Tm_2O_3 and Yb_2O_3. The accuracy meets the requirement, the coefficient of variation of 13 impurities is 4-18% and Tm 2 O 3 is 6-24%. The lower limits of determination were lower than the similar methods published at home and abroad. This method is applicable to the direct spectrometric determination of praseodymium oxide with an impurity content greater than 285ppm.