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农学学报 ›› 2013, Vol. 3 ›› Issue (1): 26-31.

• 植物保护 • 上一篇    下一篇

丙溴磷在柑桔和土壤中的残留研究

王思威 孙海滨 曾繁娟 刘明津 刘艳萍   

  • 收稿日期:2012-10-09 修回日期:2012-11-30 出版日期:2013-01-20 发布日期:2013-01-20

Residue Dynamics of Profenofo in Orange and Soil

  • Received:2012-10-09 Revised:2012-11-30 Online:2013-01-20 Published:2013-01-20

摘要:

研究丙溴磷在柑桔及土壤中的消解规律及环境评价,采用田间小区试验研究了50 %丙溴磷?炔螨特乳油在柑桔和土壤中的残留消解趋势。样品采用甲醇提取,石油醚液液分配萃取,弗罗里硅土柱层析净化,GC-ECD检测分析。2010-2011年广东、广西和福建三地的田间试验结果表明:丙溴磷在柑桔和土壤中半衰期分别为4.3~7.2天、5.5~8.1天。施药浓度333 mg/kg,2次施药,药后21 d,柑桔全果中丙溴磷最终残留量<0.01-0.04 mg/kg,柑桔果肉中丙溴磷的最终残留量均小于0.01 mg/kg,均低于我国规定的丙溴磷在柑桔上的最大残留限量值0.2 mg/kg,果皮中的残留量为0.03~0.30 mg/kg,可知,施用后的丙溴磷大部分残留于柑桔果皮中。按照推荐施药剂量为333 mg/kg处理,安全间隔期为21 d,施药次数不超过2次,食用柑桔果肉是安全的,柑桔果皮需经过加工处理不能直接食用。

关键词: 玉米大斑病, 玉米大斑病, 链格孢菌, 毒力测定, 异菌脲, 室内试验, 病原菌分离鉴定

Abstract:

Field trial and Gas chromatography are carried out to study residual decline and final residues of profenofos in the orange and soil. The GAP of profenofos in application was discussed. The half-lives of profenofos were 4.3~7.2 d and 5.5~8.1 d in orange and soil. The decline rules of profenofos in orange and soil followed the first order chemical reactions dynamics equation. The orange was sprayed two times with 50% EC according to the recommended dosage 333 mg/kg, the results revealed that the profenofos terminal residues in the whole orange was <0.01~0.04 mg/kg at the 21 d after the last application, the residue in the flesh was all below the 0.01 mg/kg. The residue were all below the MRL in China (0.2 mg/kg). Its recommended that the pre-harvest interval of profenofos in orange set at 21 d, the maximum application times is safe for orange below two by applying 333 mg/kg of 50 % profenofos EC.