発光分光分析および蛍光X線分析による鉄鋼中の希土類元素の定量の研究

概要

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By the iron oxide powder-d.c.arc spectrographic method, the concentration of lanthanum from. 0.005 to 1 per cent and cerium from 0.008 to 0.6 per cent in iron and steel are determined with a standard deviation less than 0.02 per cent.By using these samples as the standard in the ingot. spectrographic method, the excitation was performed by a high voltage a.c.arc or a spark depending on the concerned elements.The high voltage a.c.arc method is better than the spark method because of the wide range of detection and the linearity and the repeatability of the calibration curves for these elements.By using the same standard sample, the concentration of lanthanum from 0.005 to 0.73 per cent and cerium from 0.008 to 0.35 per cent are determined with a standard deviation less than 0.008 per cent by the fluorescent x-ray method with LaLa and CeLα line.And by the copper spark spectrographic method, the concentration of lanthanum, cerium, praseodymium, neodymium, . samarium, europium, gadolinium and terbium of 1 to 5γ/m<I>l</I> in iron and steel are determined by the extraction method with methyl iso-butyl ketone.