【作者】 王学东； 梁生英； 周红斌；

【Author】 Wang Xuedong~1 Zhou Hongbin~1 Wang Huili~1 Fan Defang~2 (1. College of Chemistry, Central China Normal University, Wuhan 430079) (2. Institute of Pesticide Environmental Toxicology, Zhejiang University, Hangzhou 310029)

【机构】 华中师范大学化学学院； 河南省新蔡县植保站；

【摘要】 运用模拟太阳光,探讨了咪唑烟酸在浙江四种典型土壤表面的光解动力学特征,分析了不同添加浓度,不同光强对其降解动力学的影响,结果表明,四种土壤的光解快慢顺序为:黄筋泥>黄红壤>海涂土>小粉土,其中最快的降解速率是最慢的1.38倍,影响光解半衰期最主要的因素为土壤的酸碱度,呈正相关,既土壤的pH越高,其半衰期越长;而在光照强度较高,添加浓度相对较低的情况下,咪唑烟酸的降解较快。咪唑烟酸在不同湿度土壤中的光解深度明显不同,在风干土壤中,4和土壤的光解深度分别在0.07～0.14mm之间;而在60%田间持水量的土壤中,4种土壤的光解深度比风干土壤平均提高2～3倍。更多还原

【Abstract】 The photolytic dynamic was probed on the surface of four kinds of soil, which were typical in Zhejiang province, under simulated sunlight, and the effect of different fortified cocentration, light intensity on decomposition were also analysed. The results showed that photolytic rates were in the following order huangjin mud>yellow red loam soil>coast soil>powder soil, among which the fastest degradation rate was 1.38 times as the slowest one. The most remarkable influencing factor is pH values that is proportional to photolytic half-life of imazapyr. With increasing of light intensity and decreasing of the fortified concentration, the degradation of imazapyr will be fast. The photolytic depth of imazapyr in four air-dried soil varies from 0.07 to 0.14mm, while it increases 2 or 3 times in 60%WHC as deep as in air-dried soil on average.更多还原