けい光 X 線分析法による高炭素フェロニッケル中のいおうけい素, ニッケル, クロムおよびコバルトの定量  [in Japanese] Determination of Sulfur, Silicon, Nickel, Chromium and Cobalt in Ferro-nickel Containing High Carbon by X-ray Fluorescent Analysis  [in Japanese]

A study has been made, by using the Shimazu-ARL X-ray quantometer, on the analytical precision of S, Si, Ni, Cr, and Co in Ferro-nickel containing high carbon as a raw material for stainless steels. Samples are prepared by pouring the melt into a metallic mold and grinded with No.80 emery paper after cutting them. No segregation of the above elements are found regardless of the high carbon content (2%<) in the sample. The multiple linear regression method is employed to improve the analytical precision of S, Si, Ni, Cr and Co. Si and C effect the determination of S. The precision and reproducibility of the above elements are as follows : (1) Precision. (σ⊿=√<Σ⊿^2/(n-1)>) S : 0.003%, Si : 0.041%, Ni : 0.137%, Cr : 0.032% and Co : 0.008% (2) Reproducibility. X^^-% R% σ% C.V.% S 0.076 0.004 0.0014 1.8 Si 1.83 0.04 0.012 0.66 Ni 24.36 0.09 0.033 0.14 Cr 1.78 0.01 0.0048 0.79 Co 0.61 0.01 0.0053 0.30