イオン交換分離/誘導結合プラズマ質量分析法による鉄鋼およびシリコン材料中極微量ホウ素の定量
1999 年 85 巻 2 号 p. 114-118
詳細
1999 年 85 巻 2 号 p. 114-118
A rapid and high sensitive analytical method for the trace amounts of boron in high-purity steel and silicon material has been investigated.
Steel sample was dissolved in HCl-HNO3 mixture, and boron nitride in the sample was decomposed completely by treatment of H2SO4 H3PO4 fuming at 290°C for over 30 min. After masking of Fe by the addition of CyDTA, the pH value of the sample solution was adjusted at 8 by aqueous ammonia. The sample solution was passed through the column of anion exchange resin (Amberlite® IRA-743), and B was adsorbed selectively as boric acid on the resin. After washing the column for the removal of Fe and H2SO4H3SO4, B was eluted by small amount of 2M HCl, and was determined by ICP-MS.
The limit of detection (estimated by the 3σ of blank values) was 0.016 μg/g for steel, and 0.006 μ/g for silicon material.
