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用光谱纯石墨粉与氧化镧等量混合研匀,装入石墨电极孔穴中作阳极,在O_2∶Ar=1∶4,总流量为5升/分的氧—氩气氛中,用直流电弧激发,在二米平面光栅摄谱仪上摄谱,一次摄谱完成氧化镧中14个稀土杂质光谱测定,以logR—logC绘制工作曲线,其测定下限氧化铈、氧化镨、氧化钆、氧化铽和氧化镥为0.001%,氧化钕和氧化钐为0.0005%,氧化钇为0.0003%,氧化铕、氧化镝、氧化钬、氧化铒和氧化铥为0.0001%,氧化镱为0.00001%。总杂质量为0.0068%。变异系数:高含量为2～19%,低含量为4.5～12%。
The pure graphite powder and lanthanum oxide were evenly mixed and homogenized, and filled into the graphite electrode hole for an anode. The sample was excited by a DC electric arc in an oxygen-argon atmosphere of O 2: Ar = 1: 4 and a total flow rate of 5 liters / , The spectrograph was taken on a two-meter plane grating spectrograph, and the spectrum of 14 rare-earth impurities in the lanthanum oxide was determined by one-time spectroscopy. The working curve was plotted by logR-logC, and the lower limit cerium oxide, praseodymium oxide, gadolinium oxide, 0.001% of lutetium oxide, 0.0005% of neodymium oxide and samarium oxide, 0.0003% of yttrium oxide, 0.0001% of europium oxide, dysprosium oxide, holmium oxide, erbium oxide and lutetium oxide, and 0.00001% of ytterbium oxide. The total amount of impurities is 0.0068%. Coefficient of variation: high content of 2 to 19%, low content of 4.5 to 12%.