誘導結合プラズマ発光分析法による炭化ケイ素中のケイ素定量のための炭酸ナトリウム融解/アルカリ溶液測定法

概要

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Dissolution methods with acid solutions have generally been employed for the determination of Si in various samples by inductively coupled plasma-optical emission spectrometry (ICP-OES). However, few reports on analytical procedures with alkaline solutions have been published. Si determination in a SiC sample could be successfully performed by using a dissolution technique with an alkaline solution. The SiC sample (40 mg) in a Pt crucible was fused with 2 g of Na_2CO_3. After the melt was dissolved with water in a Teflon beaker, the solution was finished with a polypropylene flask. The alkaline solution contained Ga added as an internal standard. The solution was diluted to 100 ml and then measured by ICP-OES. For obtaining a calibration curve, SiO_2 powder was dissolved using the same procedure as that for the SiC sample. For a comparison, an acid solution was prepared by adding HCl-HNO_3 to the solution after water-dissolving a SiC sample melted with Na_2CO_3. The acid sample solution contained Zn as an internal standard. A good agreement in the analytical result of Si was obtained between the alkaline sample solution and the acid sample solution.
2003-05-05