噁草酮在水稻、稻田水和土壤中的消解动态及残留  

Dynamic and Residue of Oxadiazon in Rice, Paddy Field Water and Paddy Field Soil

作　　者：左晖 何代进 刘建宇 邵丽群 张战泓[3] ZUO Hui;HE Dai-jin;LIU Jian-yu;SHAO Li-qun;ZHANG Zhan-hong(Hunan Biological Electromechanical Vocational Technical College, Changsha 410127, PRC;Hunan Institute of Plant Protection,Changsha 410125, PRC;Hunan Vegetable Research Institute, Changsha 410125, PRC)

机构地区：[1]湖南省生物机电职业技术学院,湖南长沙410127 [2]湖南省植物保护研究所,湖南长沙410125 [3]湖南省蔬菜研究所,湖南长沙410125

出　　处：《湖南农业科学》2016年第11期71-75,共5页Hunan Agricultural Sciences

基　　金：国家重点研发计划(2016ZY06003823)

摘　　要：为了评价噁草酮在水稻上使用的安全性，在湖南、海南和山东3地通过田间试验和气相色谱-质谱分析方法研究了噁草酮在水稻、稻田水及土壤中的消解动态和最终残留。添加回收试验结果表明：在0.01~1.0mg/kg添加水平下，稻米、稻壳、水稻植株、稻田水和土壤中噁草酮的添加平均回收率为85%~100%，相对标准偏差（RSD）为0.9%~4.5%。田间试验结果表明：噁草酮在水稻植株、田水和土壤中的残留消解动态规律均符合一级动力学反应模型，其消解半衰期分别为6.6~12.4、5.5~12.8和7.9~15.4d，属于易降解农药；噁草酮在稻米中的最终残留量均小于定量限（LOQ）0.02mg/kg，低于噁草酮在糙米上的最高残留限量（MRL）0.05mg/kg，建议10%噁草酮悬浮剂在水稻上施药1次，施药剂量4500g/hm2（1350a.i.g/hm2）。To evaluate the use security of oxadiazon on rice, its degradation dynamics and final residues in rice, paddy field water and paddy field soil were studied by field experiment and gas chromatography-mass spectrometry (GC-MS) in Hunan, Hainan, and Shandong.The results showed that the average recovery rates of oxadiazon in rice, rice husk, rice plant, paddy field water, paddy field soil were inthe range of 85%-100%, with their relative standard deviations of 0.9%-4.5%. The field experiments revealed that the residual dissipationdynamics of oxadiazon in rice plant, paddy water and soil conformed to the first order kinetics reaction model, and they belong to easilydegradable pesticide. Dispelling the half-life of oxadiazon in rice plant, paddy field water and paddy field soil were 6.6-12.4 d, 5.5-12.8 dand 7.9-15.4 d. The final residual mass fraction of oxadiazon in rice was lower than the limit of quantitation (LOQ) of 0.02 mg/kg and the maximum residue limit (MRL) of 0.05 mg/kg. It was suggested to use oxadiazon 1 time with the dosage of 4 500 g/hm2 in rice field.

关 键 词：噁草酮 水稻 土壤 残留 消解动态 气相色谱 

分 类 号：TQ450.2[化学工程—农药化工]