【摘要】 建立了利用固相萃取-气相色谱(SPE-GC)测定水体中胺鲜酯残留量的方法。考查了3种不同固相萃取柱(C18、florisil、OasisRHLB)对水溶性农药胺鲜酯的吸附效果,发现它们对水中胺鲜酯的萃取效率依次为8%、13%和96%;进一步研究了利用OasisRHLB萃取水中胺鲜酯的最佳条件(洗脱剂二氯甲烷用量4~8 mL),OasisRHLB(60 mg)小柱对胺鲜酯的保留容量高达200μg.柱-1。运用该方法测定胺鲜酯光解试验样品,结果表明胺鲜酯质量浓度的对数与光照时间呈良好的线性关系。胺鲜酯在氙灯下的光化学降解符合一级动力学反应,光解半衰期为82 m in,较易光解。更多还原

【Abstract】 A method has been developed for monitoring DA-6 in water using the solid phase extraction(SPE) method combined with gas chromatography.Three different SPE cartridges(C18,florisil and OasisR HLB)were tested in extracting DA-6,showing a recovery rate of 8%,13% and 96%,respectively.The solid phase extraction method using an OasisR HLB cartridge was further studied for its optimal operating conditions,which were found to be 4-8 mL dichloromethane as eluting solvent;the reserved capacity of an OasisR HLB cartridge(60 mg) reaches as high as 200 μg·cartridge-1.This method was applied to a photochemical degradation test of DA-6,with results showing that the photolysis of DA-6 in water followed the first order reaction,and its half-life was 82 min under xenon lamp.更多还原