摘要
为检测水稻中稻瘟酰胺残留及评价其在水稻上使用的安全性,建立了稻瘟酰胺在水稻植株、土壤和田水中的残留分析方法。样品采用乙酸乙酯提取,Florisil小柱净化,气相色谱—电子捕获检测器(GC-ECD)测定。稻瘟酰胺在水稻植株、土壤和田水中的添加浓度为0.05～5.00 mg.kg-1时,平均回收率为74.98%～102.96%,相对标准偏差(RSD)为0.68%～8.07%。稻瘟酰胺在水稻植株、土壤和田水中的最低检测浓度(LOQ)均为0.05 mg.kg-1。田间试验结果表明,稻瘟酰胺在稻田样品中的消解动态符合一级动力学方程,其在水稻植株、土壤和田水的半衰期分别为3.62～5.51 d,3.60～24.32 d,2.29～26.66 d。稻瘟酰胺在水稻植株、土壤和田水中均属易降解农药。
The method for the determination of fenoxanil residues in paddy plant, soil and water were estimated for evaluating the safety of fenoxanil in paddy field. The samples were extracted with ethyl acetate, cleaned-up using a Florisil solid phase extraction cartridge, and subsequently determinate by gas chromatography-electron capture detector（GC-ECD）. Average recoveries of fenoxanil in paddy plant, soil and water were found in the range of 74. 98% - 102. 96% at the three spiking levels from 0. 05 mg·kg^-1 to 5.00 mg·kg^-1 with relative standard deviations of 0. 68% -8.07%. The limits of quantification （LOQ） in paddy plant, soil and water were 0.05 mg·kg^-1. The field experiments demonstrated that the decline curves of fenoxanil in paddy field were accorded with the first-order kinetics e- quation. The half-lives of fenoxanil in paddy plant, soil and water were 3.62 -5.51, 3.60 -24. 32, 2. 29 -26. 66 d, respectively. Fenoxanil is easily degradable pesticide in paddy plant, soil and water.
出处
《浙江农业学报》
CSCD
北大核心
2012年第5期860-864,共5页
Acta Agriculturae Zhejiangensis
基金
国家自然科学基金(21007061)
