丙草胺在水稻中的残留消解动态研究
毕业论文关键词：丙草胺；消解动态；最终残留；气相色谱；水稻
The Study on the Degradation of Pretilachlor in Paddy Field
Abstract：As a kind of amides selective herbicides, pretilachlor is widely used for control weeds in paddy field. In order to evaluate the degradation regularity and safety of propachlor in paddy field, a method was established for determination the pertilachlor residue in rice, plant, soil, paddy field water and grain. Pretilachlor residue in soil and water were extracted by ethyl acetate and extracted by acetonitrile in rice grain and plant. Then samples were purified by Florisil-SPE and determined GC with ECD-detector．The results showed that the minimum detective limit of pretilachlor was 0.0011ng and the minimum detective concentration was 0.02-0.04mg/kg in paddy water, soil, plants and rice, respectively．The average recoveries of pretilachlor ranged from 82.4% to 107.7% with the relative standard deviation between 1.6% and 7.9%． The half-lives of pretilachlor were 1.5-1.9,1.2-1.8 and 1.8-5.3d in plants, paddy water, soil. The final residue was lower than the minimum detectable concentration.
Keywords：Pretilachlor; Degradation dynamics; Final residue; Gas chromatography; Paddy
目录
摘要 1
关键词 1
Abstract 1
Key words 1
引言 2
1 材料与方法 2
1.1 试验药剂 3
1.2仪器设备 3
1.3 试剂 3
1.4 田间实验 3
1.4.1 消解动态田间试验设计 3
1.4.2 最终残留试验 3
1.4.3 样品采集 3
1.4.4 室内样品处理 3
1.5 检测方法 4
1.5.1 样品前处理 4
1.5.2 仪器条件 5
1.5.3 添加回收试验 5
1.6 数据处理 5
2 结果与分析 6
2.1 方法验证 6
2.1.1 标准曲线 6
2.1.2 最小检测量（LOD） 7
2.1.3 最低检测浓度（LOQ） 7
2.1.4 添加回收率 7
2.2 丙草胺在水稻中的消解动态 9
2.2.1 丙草胺在植株中的消解动态 9
2.2.2 丙草胺在田水中的消解动态 10
2.2.3 丙草胺在土壤中的消解动态 11
2.3 丙草胺在水稻中的最终残留 11
3 结论与讨论 13
3.1 丙草胺在植株、田水和土壤中的消解速率评价 13
3.1.1 丙草胺在植株中的消解速率评价 13
3.1.2 丙草胺在田水中的消解速率评价 13
3.1.3 丙草胺在土壤中的消解速率评价 13