石油ピッチの低温プラズマ灰化

概要

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A 10-mg sample in a vitreous-silica cup (6.3mm i. d., 15 mm long) is placed at a distance of 15 mm downstream from the glow region in a discharge tube (12.2mm i. d., 280mm long), and exposed to a stream of activated oxygen plasma, for which a microwave of 2450 MHz and 80 W, an oxygen flow rate of 200ml min^<-1>, and a pressure of 3 Torr are employed. After 3.5 h of ashing, the resulting ash is dissolved in 100 μl of 6 M hydrochloric acid, and the solution is evaporated to dryness. The residue is dissolved in 50 μl of 1.4 M nitric acid, and an aliquot is placed in a graphite furnace for atomic absorption spectrometric measurements. The loss of iron and aluminum at the low ppm level in the sample was less in the plasma ashing than in dry ashing. Inhomogeneous distribution of these impurity elements in the sample was found by the proposed method.
社団法人日本分析化学会の論文
1983-06-05