原子吸光法による石炭フライアッシュ中の重金属定量におけるフッ化水素酸分解法と酸抽出法の比較検討

概要

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Various wet digestion procedures were examined for the determination of iron, manganese, zinc, copper, lead, cadmium, and nickel in coal fly ash. The recommended procedure was as follows: a 0.3g of sample was heated gently in a mixture of 15 ml of hydrofluoric acid, 20 ml of hydrochloric acid and 3 ml of hydrogen peroxide for about 2 h and the solution was evaporated to dryness. The residue was dissolved in 20 ml of 5 M hydrochloric acid by heating gently. After filtering the insoluble residue, the filtrate was adjusted to 50 ml with 0.5 M hydrochloric acid. The concentrations were determined directly, or after extraction with diethyldithiocarbamate in butyl acetate for the metals of lower concentrations, by atomic absorption spectrometry in an air-acetylene flame. In the latter case, a large amount of iron was eliminated by the extraction from 10 M hydrochloric acid with the isopentyl acetate. The present procedure was applied for the analyses of coal fly ash samples of NBS SRM1633a and the results were in good agreement with certified or tentative values. In the case of the acid digestion procedure without hydrofluoric acid, about 38 to 59 % lower values were observed for these elements, indicating that the decomposition of silicate matrix was necessary for the determination of total amount of metals in coal fly ash.
社団法人日本分析化学会の論文
1984-04-05