摘要
为研究烯效唑在在环境中的降解特性,采用室内模拟试验方法,测定了烯效唑在水体中光解、水解及其在3种不同类型土壤中的降解特性,并对其降解特性进行了评价。结果表明,常温(25℃)下,烯效唑在pH值分别为5.0、7.0和9.03种缓冲溶液中的210d内未发生显著的水解作用,其水解半衰期均大于1a,属难水解性化合物;在人工光源氙灯条件下,该农药的光解半衰期仅为2.07h,这说明烯效唑较易光解;烯效唑在江西红壤、河南二合土与东北黑土中的降解较慢,降解半衰期均大于3个月,烯效唑在土壤中较难降解。综上所述,烯效唑在环境中具有较强的稳定性,尤其在避光条件难以降解。因此应严格掌握其使用量和使用时期;同时建议加强对烯效唑残留的跟踪监测。
The degradation of uniconazole via various mechanisms, i.e. hydrolysis, photolysis in aqueous phase, and biodegradation in soil, was investigated under laboratory conditions in order to understand the attenuation of this chemical in environment. The results indicate that uniconazole is not readily to be hydrolyzed under normal conditions. No significant loss was observed within 210 clays at pH 5.0, 7.0, and 9.0. The half-life was more than 1 year. The biodegradation at matrixes of Jiangxi red soil, Henan Erhe soil and Northeast black soil at 25 ℃ was slow, with the half-life of 128.4, 130.8, and 108.3 days, respectively. Photolysis is likely to represent the most important degradation mechanism of the chemical in environment. A half-life of 2.07 hour was found with the radiation generated by Xe lamp. The results suggest that uniconazole is stable in environment, especially under conditions without sunlight. Consequently, the dosage as well as the period of application should be well controlled and the residue should be monitored consistently at the same time.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第3期1190-1193,共4页
Journal of Agro-Environment Science
基金
国家重点基础研究发展规划(973)项目(2002CB410805)
关键词
烯效唑
光解
水解
土壤降解
uniconazole
photolysis
hydrolysis
degradation in soil
