Fluorometric determination of tin(IV) in the presence of tin(II) based on different rates of complexation with morin.

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  • モリンとの錯形成速度の差を用いるスズ（ＩＩ）共存下でのスズ（ＩＶ）の蛍光定量
  • モリン ト ノ サク ケイセイ ソクド ノ サ オ モチイル スズ 2 キョ

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Abstract

The kinetics and thermodynamics of the complexation reactions of tin(II) and tin(IV) with morin have been studied fluorometrically in sulfuric and perchloric acids to design a differential analysis of tins. The time necessary to complete the reaction in 0.53 M of the respective acids was about 5 s in sulfuric acid and about 10 s in perchloric acid for tin(II), and about 3-8 min in sulfuric acid and about 1 min in perchloric acid for tin(IV). Taking these results together with the effect of acid concentration on the fluorescence intensities of the respective complexes and morin into consideration, the conditions, in which the concentrations of morin and sulfuric acid are 8×10-4 M and 1.5 M, respectively, were selected for the determination of tin(IV) in the presence of tin(II). Under these conditions, although the fluorescence intensities of the respective complexes are almost the same, tin(II) reacts with morin about 60 times faster than tin(IV) does. Employing the difference in fluorescence intensities measured at two reaction times (20 s and 1 min) as a calibration parameter, tin(IV) up to 1× 10-5 M was selectively determined with a detection limit of 2×10-7 M. The proposed method was applied to follow the air oxidation of tin(II).

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 45 (3), 265-270, 1996

    The Japan Society for Analytical Chemistry

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