Oxidation of diazinon by aqueous chlorine: Kinetics, mechanisms, and product studies

被引:78
作者
Zhang, Q [1 ]
Pehkonen, SO [1 ]
机构
[1] Univ Cincinnati, Dept Civil & Environm Engn, Cincinnati, OH 45221 USA
关键词
diazinon; oxidation; chlorine; diazoxon;
D O I
10.1021/jf981004e
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
The oxidation kinetics and mechanisms of diazinon, an organophosphorus pesticide, by aqueous chlorine were studied under different conditions. The oxidation is of first order with respect to both diazinon and chlorine. The oxidation rate is found to increase with decreasing pH. The second-order rate constants at pH 9.5, 10.0, 10.5, and 11.0 are determined to be 1.6, 0.64, 0.43, and 0.32 M-l s(-1), respectively. Based on the rate constants at different temperatures, the activation energy is calculated to be 30 kJ/mol at pH 10.0 with a chlorine-to-diazinon ratio of 11:1, 33 kc/mol at pH 11.0 with a 11:1 ratio, and 36 kJ/mol at pH 11.0 with a 5:1 ratio, respectively. Diazoxon is identified as the oxiddation product by GC-MS. Ion chromatography analysis shows an increase of sulfate concentration as the reaction proceeds, indicating that sulfur is being oxidized to sulfate. This study indicates that oxidation by aqueous chlorine can significantly affect the fate of diazinon in the environment.
引用
收藏
页码:1760 / 1766
页数:7
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