硫氟磺酰胺防控药剂在红火蚁防治区土壤中的残留动态研究

Residual Tendency of Flursulamid in Soil of the Red Imported Fire Ant Prevented and Cured Region

应用气相色谱(电子捕获)建立了土壤中硫氟磺酰胺残留的测定方法,并对广西北流红火蚁防治区不同生境类型土壤进行了测定。结果表明,硫氟磺酰胺在土壤中的消解较快,30d后在草坪、荒地和农田土壤中的消解率都超过了75%。其中硫氟磺酰胺在草坪红壤中的消解最快,其次为荒地砂土和农田水稻土,其半衰期分别为7.8d、8.2d和9.6d。根据国内农药在土壤中的残留期划分标准,硫氟磺酰胺属于易降解类农药。

A method was developed for the residue analysis of flursulamid in soil based on gas chromatography with electron capture detector, and the flursulamid residues were determined in the different eco-environment region of red imported fire ants prevented and cured in Beiliu, Guangxi province. The results showed that flursulamid degraded rapidly in the soil, with degradation efficiency more than 75% after 30 days in three soils of eco-environment. Degradation of flursulamid in red soil of lawn was quicker than that in sand soil of wastelands and paddy soil of farmland. The half lives of flursulamid in three soils were 7.8, 8.2 and 9.6 days respectively, so flursulamid belonged to easily degraded insecticide based on the Chinese remaining period dividing standard of pesticide in soil.