Oxidation and decomposition kinetics of thiourea oxides.
Oxidation and decomposition kinetics of thiourea oxides.
复制标题
DOI：
10.1021/jp063956q
复制
发表时间：
2007-01
期刊：
影响因子：
--
通讯作者：
Q. Gao;Bing Liu;L. Li;Jichang Wang
中科院分区：
文献类型：
--
作者：
Q. Gao;Bing Liu;L. Li;Jichang Wang
本文采用反相离子对高效液相色谱法研究了二氧化硫脲和三氧化硫脲的分解和氧化动力学。高效液相色谱法可以同时测定和定量（NH2）2CSO2、（NH2）2CSO3、（NH2）2CO、SO3(2-) （HSO3-）等几种含硫试剂。实验表明，硫脲氧化物的分解为一级反应，反应速率常数随溶液pH值的增大而增大。过氧化氢对硫脲氧化物的氧化作用在研究的pH值为4.0和8.0之间的两种试剂中均为一级。测定了不同pH条件下的氧化速率常数，结果表明，增加反应溶液的pH可显著加速氧化过程。
In this report the decomposition and oxidation kinetics of thiourea dioxide and thiourea trioxide are investigated with a reversed-phase ion-pair high-performance liquid chromatography (HPLC) method. The HPLC method allows us to simultaneously determine and quantify several sulfur-containing reagents such as (NH2)2CSO2, (NH2)2CSO3, (NH2)2CO, and SO3(2-) (HSO3-). Experiments illustrate that the decomposition of thiourea oxides is a first-order reaction, in which the rate constants increase with the pH of the solution. Oxidations of thiourea oxides by hydrogen peroxide are first order with respect to both reagents within the studied pH range between 4.0 and 8.0. Oxidation rate constants are measured under different pH conditions, which show that increasing the pH of the reaction solution significantly accelerates the oxidation process.