固体質量分析法による微小部分分析の研究

概要

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Some basic techniques for the microprobe analysis by a mass spectrograph with high frequency spark source were investigated, in which platinum or tungsten wire (200μ in diameter) was used as the pointed counter electrode to plane sample. The craters on the surface of samples were 400500μ in diameter and 1020μ in depth for the exposure 1×10<SUP>-10</SUP>coulombs, and 300μ and 2μ, respectively, for the exposure 3×10<SUP>-13</SUP> coulombs. The elements of 0.01% were detected by the former exposure and those of 1% by the latter. The size of crater depended on the repetition rate of pulse and the spark voltage. The ratio of ion intensities of sample to counter electrode changed in every discharge, and for the quantitative analysis the ion intensity of counter electrode had to be subtracted from the total ion intensity. By this reason, platinum having the wide range of abundance ratio of the isotopes was more suitable than tungsten as the counter electrode. The reproductivility of microprobe analysis with low alloy steel was 517% as coefficient of variation. The technique was applied for the analysis of inclusions in stainless steel samples.
社団法人日本分析化学会の論文