不活性ガス融解法による高純度鉄中の極微量酸素の定量

概要

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Method of the determination of micro trace oxygen (ppm level) in the high purity iron has been studied cooperatively by 14 member laboratories in the Chemical Characterization Sub-committee, 19th Committee (steel making), Japan Society for Promotion of Science. The purposes of this study were set in the following focuses, 1) Improvement of analytical precision. 2) Clarification of detectable limit for oxygen determination with inert gas fusion method. 3) Establishment of sample pretreatment technique. Two types of high purity iron samples (oxygen content : <3 ppm and 5 ppm∿10 ppm) were prepared at the Institute for Material Reseach, Tohoku University. Purities of these samples were respectively 99.995% except of carbon used to killing agent. The oxygen contents in the surface layer of the sample gave an considerable increase to the analytical values for ppm-level analysis. So, pretreatment method of the samples were mainly studied in details. As the results, the pickling method with H_2O_2+HF aq. solution was established. The results obtained by the recommended procedure were compared with He^<3+> particles activation analytical values and the precisions of the both oxygen values in each sample were satisfactory. The detectable limit of oxygen by the inert gas fusion method was about 1.5 ppm.
社団法人日本鉄鋼協会の論文
1992-05-01