腈菌唑在豇豆及露地土壤中的沉积及消解特性  

Deposition and Degradation of Myclobutanil in Cowpea and Open Field

作　　者：刘雅楠[1] 李文卓[1] 魏鹏[1] 曹梦超 赵颖[1] 王蒙岑[1] 朱国念[1] 

机构地区：[1]浙江大学农药与环境毒理研究所,浙江杭州310058

出　　处：《生态与农村环境学报》2016年第5期832-836,共5页Journal of Ecology and Rural Environment

基　　金：农业部农药登记残留试验项目(2013F161);中央高校基本科研业务费专项(517302-172210151)

摘　　要：利用QuEChERS与气相色谱-串联质谱法（GC- MS/ MS）建立了腈菌唑在豇豆（ Figna unguiculata）及土壤中的残留分析方法;并结合田间试验,研究了腈菌唑在豇豆和露地土壤中的初始沉积及消解特性.结果表明,在0 . 0 0 1 - 2 mg. kg-1浓度范围内,腈菌唑的仪器响应值与其浓度呈良好的线性关系,其最小检出量为8.0X10-12 g.豇豆和土壤样品经乙腈提取后采用弗罗里硅土小柱净化,GC- MS/ MS测定;当豇豆和土壤空白样品基质中腈菌唑添加量为0 . 0 5 -2 mg. kg^-1时,平均回收率为8 6 . 6 % - 1 0 5 . 4 % ,相对标准偏差为3 . 0 % - 7 . 0 % .方法的准确度、精密度和灵敏度可满足豇豆及土壤中腈菌唑的残留检测要求.田间试验结果发现,腈菌唑在豇豆中的残留初始沉积量差异不显著,在土壤中的残留初始沉积量稍有差异,在豇豆和土壤中的消解半衰期分别为3. 1 - 4 . 3 和1 0 . 5-12. 1 d,豇豆的生长稀释和降雨是导致其在不同地区消解速率存在差异的主要因素.An analytical method using Qu ECh ERS extraction and GC-MS / MS( gas chromatography coupled with tandem mass spectrometry) was established for analysis of myclobutanil residues in cowpea and soil of the field,and initial deposition and degradation dynamics of myclobutanil in cowpea and soil of the field was also investigated in a field experiment.Results show that response value of the instrument was in linear relationship with concentration of myclobutanil in the range of 0. 001-2 mg·kg-1,and LOD of the instrument was 8×10-12 g. Myclobutanilin cowpea and soil samples were extracted with acetonitrile,purified with SPE Bond Elut-Fl columns and determined with GC-MS / MS. When myclobutanil content in the cowpea and soil samples was in the range between 0. 05- 2 mg · kg-1,the mean recovery rate reached 86. 6%-105. 4% with relative standard deviation being 3. 0%-7. 0%,which means the method satisfies the requirements for detection of myclobutanil residue in cowpea and soil in accuracy,precision and sensitivity. The field experiment shows that the deposition of myclobutanil in cowpea in the initial phase was not significant and differed slightly from that in the soil. The half-life of the substance in cowpea and soil ranged of 3. 1-4. 3 and 10. 5-12. 1 d and the growth-dilution effect of cowpea and precipitation are two dominant factors leading to variation of degradation rate of the substance in different regions.

关 键 词：腈菌唑 豇豆 土壤 残留 初始沉积 消解动态 

分 类 号：X592[环境科学与工程—环境工程]