フッ化水素酸－硝酸を用いるマイクロウェーブ加圧溶解/誘導結合プラズマ発光分光分析法によるニオブ，ホウ素，ケイ素含有金属ガラスの組成分析

Metallic glasses containing iron, cobalt, niobium, boron and silicon were analyzed. The samples could be dissolved only with a mixture of hydrofluoric acid and nitric acid. After a sample dissolved, metallic elements were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES). Conventional ICP-OES instruments were not employed because hydrofluoric acid attacked the plasma torch, chamber and nebulizer, which were made of quartz or glass. When a sample solution contained hydrofluoric acid, hydrofluoric acid was removed by heating with sulfuric acid. However, this removal technique led to a loss of boron and silicon. By a microwave-assisted dissolution procedure with a mixture of hydrofluoric acid and nitric acid, boron and silicon were not vaporized. A hydrofluoric acid resisting ICP-OES instrument was employed for elemental determination. The total values of all the elements determined were almost 100%.