Fate of Fluazinam in Pepper and Soil After Application  

作　　者：DONG Feng-shou YANG Shuang LIU Xin-gang SUN Jian-peng ZHENG Yong-quan LI Chong-jiu YAO Jian-ren 

机构地区：[1]College of Science, China Agricultural University, Beijing 100094, P.R. China [2]Key Laboratory of Pesticide Chemistry and Application Technology, Ministry of Agriculture/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, P.R.China [3]Northeast Agricultural University, Harbin 150030, P.R.China

出　　处：《Agricultural Sciences in China》2008年第2期193-199,共7页中国农业科学（英文版）

摘　　要：To discover the fate of fluazinam after its application in pepper field, an efficient residual analytical method for determining fluazinam in pepper and soil was developed. The samples were extracted by acetone, cleaned up by solid-phase extraction （SPE） florisil cartridge, and determined by gas chromatography with electronic capture detector （ECD）. The recoveries ranged from 80 to 94.6%, with repeatability relative standard deviation ≤9.3% at spiking levels of 0.1-1 mg kg^-1. The residue dynamics of fluazinam in pepper and soil were studied in a field plot. The experiment data showed that the halflives of fluazinam in peppers and soils were 2.5-3.7 days and 1.2-4.2 days, respectively. When the pepper was treated by fluazinam 50% suspension concentrate （SC） at 495 g ha^-1 4 times at 7-day intervals, the fluazinam in pepper on the 7th day after the last application was all below 0.06 mg kg^-1, which was below the maximum residue limit （MRL） fixed in Korea （0.3 mg kg^-1）. It is implied that fluazinam in pepper is nonpersistent. The results suggested that fluazinam 50% SC should be used in a pepper field at most for 4 times, and the pre-harvest interval should be 7 days.To discover the fate of fluazinam after its application in pepper field, an efficient residual analytical method for determining fluazinam in pepper and soil was developed. The samples were extracted by acetone, cleaned up by solid-phase extraction （SPE） florisil cartridge, and determined by gas chromatography with electronic capture detector （ECD）. The recoveries ranged from 80 to 94.6%, with repeatability relative standard deviation ≤9.3% at spiking levels of 0.1-1 mg kg^-1. The residue dynamics of fluazinam in pepper and soil were studied in a field plot. The experiment data showed that the halflives of fluazinam in peppers and soils were 2.5-3.7 days and 1.2-4.2 days, respectively. When the pepper was treated by fluazinam 50% suspension concentrate （SC） at 495 g ha^-1 4 times at 7-day intervals, the fluazinam in pepper on the 7th day after the last application was all below 0.06 mg kg^-1, which was below the maximum residue limit （MRL） fixed in Korea （0.3 mg kg^-1）. It is implied that fluazinam in pepper is nonpersistent. The results suggested that fluazinam 50% SC should be used in a pepper field at most for 4 times, and the pre-harvest interval should be 7 days.

关 键 词：FLUAZINAM RESIDUE PEPPER SOIL 

分 类 号：S18[农业科学—农业基础科学]