水-有機混合溶媒中の塩基(または酸)の電位差定量

概要

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The potentiometric determination method of bases (or acids) in water-organic solvent mixture, combining additions of reactant (concentration: c_r, addition volume: V_r), diluent (titration volume: v_d, final addition volume: v_<d0>) and titrant (concentration: c_t, titration volume: v_t), was presented. The concentration of n-acidic base (or, n-basic acid), c_x, is determined from the slope f of linear plots of 10^<ΔE/S> vs. {v_d-0.5v_<d0>} of the following equation: 10 ^<ΔE/S>=1+f{v_d-0.5v_<d0>} where ΔE=E_t-E_d (E_d and E_t are electromotive forces in additions of the diluent and titrant respectively), f=c_t/(c_rV_r-nc_xV_x) and S is a response slope of the pH-sensing glass electrode. Since the adjustments of ionic strength and solvent composition are unnecessary, in this method, it is advantageous to apply to the sample in which solvent composition and ionic strength are unknown. The present method can be applied successfully to base (or acid) in water-organic solvent mixture with almost the same accuracy and precision as in aqueous solution.
中部大学の論文