Kinetics of sulphur(IV) oxidation by hydrogen peroxide in basic aqueous solution
Kinetics of sulphur(IV) oxidation by hydrogen peroxide in basic aqueous solution
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DOI：
10.1016/1352-2310(95)00422-x
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发表时间：
1996-04
影响因子：
5
通讯作者：
J. Lagrange;C. Pallarès;G. Wenger;P. Lagrange
中科院分区：
文献类型：
--
作者：
J. Lagrange;C. Pallarès;G. Wenger;P. Lagrange
用分光光度法测定了低H+浓度下的反应速率。研究了反应动力学与[SO32−]、[H+]和过氧化氢总浓度([H2O2]TOTAL=[H2O2]+[H02−])的关系。速率方程为：速率={(2.41×10~(−)4+2.61×10~(10)[H~+])/(1+1.10×10~(11)[H~+])}[SO_2~(−)][H_2O_2]与实验条件之和为：−−[H~+]>；8.5；1moll−_1NaCl04；25°C。实验数据可以假设最重要的反应是发生在S032−和H_2O_2之间以及S032−和H_2O_2之间的两个双分子过程(速率常数分别为K_1和K_2)。测定了几种不同浓度的离子介质NaCl04、NaCl4和Na2SO4的速率常数k1。K1的变化以扩展的德拜-胡克尔公式的形式写成离子强度的函数。在25°C时，K1=0.247−1ls−1的值外推为零离子强度。
The reaction rate has been determined at low H+ concentration by spectrophotometric measurements. The kinetics were studied as a function of [SO32−], [H+] and total hydrogen peroxide concentration ([H2O2]total= [H2O2] + [H02−]). The rate law is expressed as: Rate= {(2.41 × 10−4+ 2.61 × 1010[H+])/(1 + 1.10 × 1011[H+])}[SO32−][H2O2]totalwith the experimental conditions : − log [H+] > 8.5; 1 moll−1NaCl04; 25°C. The experimental data may be interpreted on the assumption that the most significant reactions are two bimolecular processes occurring between S032−and H2O2and between S032−and HO2−(rate constants, respectively, k1and k2). The rate constant k1was determined for several concentrations of different ionic media NaCl04, NaCl and Na2SO4. The variation of k1is written as a function of the ionic strength in the form of an extended Debye-Hu¨ckel formula. The value of k1= 0.247 mol−1ls−1was extrapolated to zero ionic strength at 25°C.