液相微萃取／高效液相色谱法测定环境水样中的痕量苯脲类除草剂

建立了液相微萃取／高效液相色谱联用(LPME／HPLC)技术同时测定环境水中痕量异丙隆、秀谷隆和灭草隆除草剂的分析方法.考察了不同萃取条件及测定条件对检测结果的影响.优化后的萃取条件为:6μL正辛醇作萃取剂,液滴体积3μL,搅拌速度450 r/min,萃取30 min.结果表明,在优化条件下,3种除草剂的质量浓度在0....

Determination of Trace Phenylurea Herbicides in Environmental Water by Liquid Phase Microextraction Coupled with High Performance Liquid Chromatography

A novel method was developed for the simultaneous determination of three trace phenylurea herbicides,such as isoproturon,metobromuron and monuron in environmental water,by liquid phase microextraction(LPME) coupled with high performance liquid chromatography(HPLC).The effects of differerent extraction and measuring conditions on detection were investigated.The optimal experimental conditions were as follows:organic solvent:6 mL octanol,drop volume:3 μL,stirring speed:450 r/min,extraction time:30 min.Under the optimal conditions,the enrichment factors of isoproturon,metobromuron and monuron were 510,490 and 350,respectively.There was a good linearity between peak area and concentration of three herbicides in the range of 0.5-800 μg/L,with correlation coefficient of 0.995 8-0.998 3.The detectioin limits of three phenylurea herbicides ranged from 0.2 μg/L to 0.4 μg/L.The spiked recoveries of three herbicides from environmental water samples were in the range of 62%-92% with relative standard deviations(RSDs) no more than 7.7%.The method showed the advantages of sensitivity,simplicity and fastness for the use of very small amounts of organic solvent,and could meet the requirements of the determination of trace phenylurea herbicides in environmental water samples.