Influence of pH and dissolved organic matter on photolysis of metsulfuron-methyl

摘要：

　　The chemical degradation of the herbicide metsulfuron-methyl was investigated in aqueous solutions at different pH values and dissolved organic matter (DOM) addition.The results indicated that the photoreaction rate of metsulfuron-methyl was conformed to first-order kinetics behavior in all case.Expose to the same light intensity,the photodegradation rate of metsulfuron-methyl was much faster in acidic than in neutral or basic conditions.The presence of DOM derived from rice straw (RS) and pig manure (PM) reduced degradation rates and had a quenching effect on the photodecomposition of metsulfuron-methyl,the quenching effect increases with increasing and RS and PM concentration in aqueous solutions.RS has a greater ability to quenching the photolysis compared to PM.

关键词： metsulfuron-methyl photolysis DOM pH UV absorption spectra

作者: Ninghui Song Diandian Wang Zhengjun Shan Lili Shi

作者单位: Nanjing Institute of Environmental Science, Ministry of Environmental Protection of the Peoples of Nanjing Institute of Environmental Science, Ministry of Environmental Protection of the Peoples of

会议类型: 国际会议

会议名称: 2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)

会议地点: 大连

会议语种:英文

页码: 462-466

在线出版日期: 2013-06-04（万方平台首次上网日期，不代表论文的发表时间）