Abstract：Copper powder, as the conductive medium, was mixed evenly with lanthanum oxide powder and tableted. Then the contents of some impurity elements in high purity lanthanum oxide powder were determined by direct current glow discharge mass spectrometry (dc-GDMS). The glow discharge conditions like the discharge current, the discharge gas flow rate and the ion source temperature as well as the tableting conditions including the mixing ratio of the two powders and the tableting machine pressure were investigated in terms of their impact on the discharge stability and the sensitivity in order to optimize the experimental conditions. Meanwhile, the total signal of La, O and Cu was normalized and then the content of impurity elements in high purity lanthanum oxide powder were obtained by subtraction. Copper powder was considered a reagent blank, and determined for eleven times to obtain the detection limit for analyte elements in the range of 0.005-0.34 μg/g. The high purity lanthanum oxide powder sample was determined independently for six times. The results were consistent with those obtained by inductively coupled plasma mass spectrometry, and the relative standard deviations (RSD, n=6) were less than 20%.
胡芳菲, 王长华, 李继东. 直流辉光放电质谱法测定高纯氧化镧中25种杂质元素[J]. 冶金分析, 2014, 34(3): 24-29.
HU Fang-fei, WANG Chang-hua, LI Ji-dong. Determination of twenty-five impurity elements in high purity lanthanum oxide by direct current glow discharge mass spectrometry. , 2014, 34(3): 24-29.
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