微量元素の光吸収分析法の開発と環境標準試料への応用

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Recent advance in our laboratory is reviewed and some new analytical data are prensented. Spectrophotometric and atomic absorption spectrophotometric methods - mainly based on extraction separation schemes - are developed for the determination of minor and trace elements. In the spectrophotometric determination of metal ions, our research interest is directed to the use of color-forming basic dyes, i.e. triphenylmethane dyes. These dyes form ion associates with anionic complexes of metal ions (halide complexes of Sb(V), Ga(III), In(III) and Ti(III)) and much higher sensitivity is attained in the ternary system. A unique example is the spectrophotometric method for phosphate, in which heteropoly acid anions are determined as ion associates with methylene blue. Two highly sensitive spectrophotometric procedures have been developed, catalytic determination of Mn(II) and flotation-spectrophotometric determination of P(V) and Ge(IV). The principle and advantage of the flotation method is discussed and its analytical potentiality is shown. The analytical sensitivities in atomic absorption spectrophotometry are improved by preconcentrating the particular elements into organic solvent before their determination. Typical examples are as folloWs, determination of Sb, Sn, Cu and Pb (pyrrolidine dithiocarbamate-methyl isobutyl ketone (MIBK) extraction), simultaneous determination of Cr(III) and Cr(VI) (diethyl dithiocarbamate- MIBK) and indirect determination of Ge(IV) and Ta(V) (heteropoly acid complex-MIBK). The extraction-atomic absorption spectrophotometric methods have successfully been applied to the analysis of alloy, polymer, coal and coal fly ash.　In connection with environmental problems, the need for botanical materials for use in laboratory intercomparison study has prompted us to prepare and evaluate standard reference materials. Two botanical samples, ”KANBOKU (Viburnum Opulus L.)” and ”Chishima SASA (Sasa Kurilensis)” are selected and their versatility is investigated sample preparation procedures are outlined and analytical results for non-metallic elements (P, Cl, S and B) are shown.
山形大学の論文
1983-01-20

微量元素の光吸収分析法の開発と環境標準試料への応用

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