三环唑和嘧菌酯在水稻植株和田间的残留及消解动态  

Residues and dissipation dynamics of tricyclazole and azoxystrobin in rice plant and field

作　　者：宋世明[1] 陈兆杰[1] 韦婕[1] 邓程[1] 谭辉华[1] 李雪生[1] 

机构地区：[1]广西大学农药与环境毒理研究所,广西南宁530005

出　　处：《华南农业大学学报》2017年第4期80-86,共7页Journal of South China Agricultural University

基　　金：广西农业厅重点项目(桂农业发[2014]35号)

摘　　要：【目的】研究三环唑和嘧菌酯在水稻植株、稻田水和土壤中的残留及消解动态。【方法】水稻样品用乙腈或二氯甲烷提取,提取液浓缩后经高效液相色谱(三环唑)和气相色谱(嘧菌酯)分析。【结果】三环唑和嘧菌酯的最低检出限(LOQ)分别为0.05和0.01 mg·L^(-1),平均回收率分别为78.5%~100.8%和73.9%~109.7%,相对标准偏差(RSD)分别为1.0%~12.9%和3.1%~12.9%;三环唑和嘧菌酯在水稻植株、稻田水和土壤中的残留消解动态规律符合一级动力学方程,三环唑和嘧菌酯的半衰期分别为2.4~13.1和4.3~16.1 d。【结论】三环唑和嘧菌酯属于易降解农药,检测方法的灵敏度、准确度及精密度均符合农药残留分析要求。【Objective】To study the residues and dissipation dynamics of tricyclazole and azoxystrobin in rice plant, soil and paddy water.【Method】Rice samples were extracted with acetonitrile or dichloromethane, the extracts were enriched and then analyzed by high performance liquid chromatography（tricyclazole） and gas chromatography（azoxystrobin）.【Result】The limits of quantification（LOQ） were 0.05 and 0.01 mg·L-1, the average recovery rates ranged from 78.5% to 100.8% and 73.9% to 109.7%, and the relative standard deviations （RSD） ranged from 1.0% to 12.9% and 3.1% to 12.9% for tricyclazole and azoxystrobin respectively. The dissipation dynamics of tricyclazole and azoxystrobin residues in rice plant, soil and paddy water fitted the first-order kinetic equations. The dissipation half-lives of tricyclazole and azoxystrobin in rice ranged from 2.4 to 13.1 and 4.3 to 16.1 d respectively. 【Conclusion】Tricyclazole and azoxystrobin are both easily degradable pesticides. The sensitivity, accuracy and precision of the detection methods all meet the requirements for pesticide residue analysis.

关 键 词：三环唑 嘧菌酯 水稻植株 土壤 稻田水 残留 消解动态 

分 类 号：S511[农业科学—作物学] S502