2-ヒドロキシ-1-ナフトアルデヒド-セミカルバゾンによるスカンジウムの蛍光定量 : 鉱物試料への適用(<特集>無機材料分析のためのスペクトロメトリー)

概要

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A fluorometric method for the determination of micro amounts of scandium with 2-hydroxy-l-naphth-aldehyde-semicarbazone (2-HNS) was studied and applied to the analysis of mineral samples. To a sample solution containing less than 5.0 μg of scandium, were added 2 ml of 2-HNS solution in DMF (Sc 0〜5.0 μg : 0.05%, Sc 0〜1.0 μg : 0.025%, Sc 0〜0.2 μg : 0.01%) and 1ml of 20w/v% ammonium acetate solution. The pH of the solution was adjusted to 5.9±0.1 with hydrochloric acid or ammonia water, and the solution was diluted to 25 ml with water. The fluorescence intensity was measured at 445 nm (λ_<ex.> : 405 nm) against the standard quinine sulfate solution (10 μg/ml and 1.0 μg/ml). Scandium (0.01〜0.26%) in several minerals could be determined by this method, where the scandium was separated from interfering elements by extracting with 0.4 M 2-thenoyltrifluoroacetone-benzene before the determination of scandium. The analytical results were in good agreement with those by ICP-AES.
1986-08-05