| 异噁唑草酮在土壤表面光解及在土壤中的降解和淋溶特性 |
|
投稿时间：2019-01-22
点此下载全文
HTML
|
| 引用本文：张春荣,汤涛,何红梅,等.异噁唑草酮在土壤表面光解及在土壤中的降解和淋溶特性[J].农药学学报,2019,21(3):352-358. |
| 摘要点击次数: 3639 |
| 全文下载次数: 968 |
|
| 基金项目:国家自然科学青年基金（31501668） |
|
| 中文摘要:为合理评估除草剂异噁唑草酮的环境风险，在实验室模拟条件下，研究了异噁唑草酮在土壤（红壤土）表面光解以及在不同质地土壤（潮土、水稻土和红壤土）中的降解和淋溶特性。结果表明：异噁唑草酮在土壤表面的光解遵循一级反应动力学方程ct = 4.23e–0.008t（r = 0.937），半衰期为82.5 h；其在潮土、水稻土和红壤土中的降解均符合一级动力学方程，好氧条件下，异噁唑草酮在3种土壤中的降解半衰期分别为10.5、43.3和139 h，厌氧条件下的降解半衰期分别为19.4、18.4和158 h；其在潮土、水稻土和红壤土中的淋溶系数（Rf）分别为0.417 0、0.083 3和0.083 3。研究表明：异噁唑草酮在土壤表面光解速率较慢，而在土壤中好氧及厌氧条件下降解速率均较快，残留期短；其在土壤中淋溶性较弱，不易对周围环境及地下水造成污染风险。 |
| 中文关键词:异噁唑草酮 土壤 光解 降解 淋溶 环境污染 风险评估 |
| |
| Photolytic properties of isoxaflutole on the soil surface and its degradation, leaching properties in soils |
|
|
| Abstract:To assess the environmental risk of isoxaflutole, the laboratory microcosm studies were conducted to investigate the photolytic properties of isoxaflutole on the red soil surface and its degradation, leaching properties in three contrasting soils (moisture soil, paddy soil and red soil). The results demonstrated that photodegradation of isoxaflutole on the surface of red soil followed the first-order kinetics model, and the equation was as follows: ct = 4.23e–0.008t (r = 0.937) with a half-life of 82.5 h. The degradation in three soils (moisture soil, paddy soil and red soil) also followed the first-order kinetics model. The aerobic degradation half-lives in three soils were 10.5, 43.3 and 139 h, respectively, and the anaerobic degradation half-lives were 19.4, 18.4 and 158 h, respectively. The leaching coefficients (Rf) in moisture soil, paddy soil and red soil were 0.417 0, 0.083 3 and 0.083 3, respectively. The results showed that the photodegradation rate of isoxaflutole on the surface of soil was slow. But its degradation rate in soils was fast under aerobic or anaerobic conditions which led to short residue period. The results indicated that it's not easy for isoxaflutole to cause pollution risk to the surrounding environment and groundwater. |
| Key words:isoxaflutole soil photodegradation degradation leaching environment pollution risk assessment |
|
查看全文
查看/发表评论
下载PDF阅读器 |
|
|
|
