溴菌腈在苹果和土壤中的残留消解动态研究

The Dynamics of Bromothalonil Residue Disappearance in Apples and Soil

采用田间试验及气相色谱检测方法,研究了溴菌腈在苹果和土壤中的残留消解动态。结果表明,溴菌腈在苹果和土壤中消解较快。在苹果中半衰期为0.9-1.0d,药后14d消解90%以上;在土壤中的半衰期为0.8-1.2d,药后21d消解90%以上。25%溴菌腈可湿性粉剂,施药浓度2000-4000mg·kg-1(有效成分500-1000mg·kg-1),施药3-4次,药后7、14、21d苹果和土壤中残留量均未超过0.1mg·kg-1。

Bromothalonil is commonly used for control of apple diseases. To determine the dynamics of bromothalonil residue disappearance, apple and soil samples were collected after bromothalonil application on apple trees. Residues were extracted with toluene, acetone and dichloromethane, cleaned up by SPE cartridge, and determined with GC equipped by ECD detector. Bromothalonil decomposed quickly in apples and soil, with half-lives of 0.9～1.0 d and 0.8～1.2 d, respectively. Bromothalonil decomposed more than 90% after 14 d in apples and after 21 d in soil. When bromothalonil 25 WP at 500 mg·L^-1 and 1 000 mg·L^-1 dilutions was applied 3 or 4 times on apple trees, detectable residues were less than 0.1 mg·kg^-1 in apples and soil 7,14 and 21 d after the last application.