Kinetics and mechanism of the oxidation of sulfite by chlorine dioxide in a slightly acidic medium

被引：32

作者：

Horváth, AK ^{[1
]}

Nagypál, IN ^{[1
]}

机构：

[1] Univ Szeged, Dept Phys Chem, H-6701 Szeged, Hungary

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2006年 / 110卷 / 14期

关键词：

D O I：

10.1021/jp060246b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The sulfite-chlorine dioxide reaction was studied by stopped-flow method at I = 0.5 M and at 25.0 +/- 0.1 degrees C in a slightly acidic medium. The stoichiometry was found to be 2SO(3)(2-) + 2(.)ClO(2) + H2O -> 2SO(4)(2-) + Cl- + ClO3- + 2H(+) in (ClO2)-Cl-. excess and 6SO(3)(2-) + 2(.)ClO(2) -> S2O62- + 4SO(4)(2-) + 2Cl(-) in total sulfite excess ([S(IV)] = [H2SO3] + [HSO3-] + [SO32-]). A nine-step model with four fitted kinetic parameters is suggested in which the proposed adduct (SO3ClO22-)-S-. plays a significant role. The pH-dependence of the kinetic traces indicates that SO32- reacts much faster with (ClO2)-Cl-. than HSO3- does.

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页码：4753 / 4758

页数：6

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