白鋳鉄中ケイ素のモリブデン青吸光光度分析 フッ素イオンを配合した溶解酸の適用
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In the case of determining silicon in iron and steel spectrophotometrically by molybdenum blue method, white cast iron is generally excluded from this application as it shows abnormally low analytical values.<BR>The authors have established a quantitative procedure for the determination of silicon in white cast iron without annealing the sample. The procedure recommended was as follows. The dissolving acid was prepared by mixing sulfuric acid (1+11) and 15% hydrogen peroxide in volume ratio 3 : 1, to. which was added 1.5% ammonium fluoride. After the sample was dissolved, the excess of fluoride ions was masked with boric acid, and silicon was subsequently determined by the usual analytical procedure.<BR>The values obtained by this method were in good agreement with those by gravimetric method. The variation coefficient was 1% for both white cast iron and annealed samples.