悬浮固化分散液液微萃取-毛细管电泳法测定水中磺酰脲类除草剂

建立了悬浮固化分散液液微萃取-毛细管电泳法同时测定水中磺酰脲类除草剂残留的方法。以十二醇为萃取剂、甲醇为分散剂，采用悬浮固化分散液液微萃取技术对水样进行分离提取，并结合毛细管电泳法进行测定。该方法可以有效提取、分离、检测水中残留的微量苯磺隆、吡嘧磺隆、苄嘧磺隆等9种磺酰脲类除草剂，各待测物在10.0~1000 μg/L范围内线性关系良好，相关系数r≥0.992，方法检出限为2.40~7.50 μg/L，方法精密度为6.55%~13.9%。将该方法用于实际水样的测定，取得了较满意的结果，加标回收率为82.0%~104%。该方法简便快速，适合水中磺酰脲类除草剂的同时测定。

Solidification of floating organic drop dispersive liquid-liquid microextraction combined with capillary electrophoresis for the determination of sulfonylurea herbicides in water

A novel method of solidification of floating organic drop dispersive liquid-liquid microextraction for the simultaneous determination of sulfonylurea herbicides in water samples by capillary electrophoresis was established. Sulfonylurea herbicides in water samples were extracted by solidification of floating organic drop dispersive liquid-liquid microextraction using dodecanol as extractant and methanol as dispersive solvent, and were determined with capillary electrophoresis. Nine kinds of sulfonylurea herbicides such as tribenuron-methyl, pyrazosulfuron-methyl, bensulfuron-methyl and so on were detected by this method. The good linearities were obtained in the range of 10.0-1000 μg/L. The correlation coefficiencies were not less than 0.992. The method detection limits (MDLs) ranged from 2.40 to 7.50 μg/L. The relative standard derivations (RSDs) of the method were 6.55%-13.9%. The method was applied for the determination of water samples and showed satisfactory results. The spiked recoveries ranged from 82.0% to 104%. The method is quick, sensitive and suitable for the batch analysis of sulfonylurea herbicides in water samples.