基本式の誘導とサッカリンの定量例 : 定量班点分析の研究(第1報)
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Three types of solute stains were obtained by spotting a solution gradually on a filter paper, <I>i. e</I>., (I) a round spot of solute separated from its solvent, (II) a ring stain of solute and (III) a round spot of unseparated solute and solvent. The following equations were derived for the type (I), <BR>log[M]<SUB>σ</SUB>=<I>k</I><SUB>D</SUB><I>v</I><SUP>*</SUP>+log <I>k</I><SUB>D</SUB>-log(1+<I>k</I><SUB>D</SUB><I>v</I><SUP>*</SUP>) +log[M]<SUB>φ</SUB> where [M]<SUB>σ</SUB>: concentration of solution (mmol/<I>l</I>), [M]<SUB>φ</SUB>: amount of solution absorbed per unit area of filter paper (mmol/cm<SUP>2</SUP>), <I>v</I><SUP>*</SUP>: retention of solution per unit area of filter paper (m<I>l</I>/cm<SUP>2</SUP>) after diffusion of the solution, and <I>k</I><SUB>D</SUB>: <I>s</I><SUP>*</SUP>/<I>V</I><SUP>*</SUP>, in which <I>V</I><SUP>*</SUP> is amount of solution added (m<I>l</I>) and <I>s</I><SUP>*</SUP> is area of the spot after diffusion, and hence log[M]<SUB>σ</SUB>_??_log <I>k</I><SUB>D</SUB>+log[M]<SUB>φ</SUB>, when <I>k</I><SUB>D</SUB> is small, and log[M]<SUB>σ</SUB>_??_<I>k</I><SUB>D</SUB><I>v</I><SUP>*</SUP>+log[M]<SUB>φ</SUB>/<I>v</I><SUP>*</SUP>, when <I>k</I><SUB>D</SUB> is large.<BR>The determination was possible by using above two equations. For example, the equation was applied satisfactorily to the determination of saccharin. The presence of dulcin gaining the spot of type (III) did not interfere with the determination, and saccharin and sodium cyclamate also of type (I) could be determined simultaneously with only a little modification of the procedure.
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