应用中空纤维液相微萃取-高效液相色谱法测定水中二氯喹啉酸、特丁噻草隆、戊炔草胺等3种除草剂的残留量.样品以聚丙烯中空纤维为支撑,正辛醇萃取,以600 r·min-1转速在40 ℃的条件下萃取20 min.所得净化液以Inertsil ODS-SP C18色谱柱为分离柱,以甲醇-水(82+18)混合液为流动相,在检测波长220 nm处进行测定.3种除草剂在一定的质量浓度范围内与其峰面积呈线性关系,方法的检出限(3S/N)在0.20~0.35 μg·L-1之间.以地表水样为基体进行加标回收试验,所得回收率在90.6%~106%之间.方法的相对标准偏差(n=6)在3.1%~6.8%之间.

HPLC was applied to the determination of residual amounts of 3 herbicides,i.e. quinclorac,tebuthiuron and propyzamide in water with hollow fiber liquid phase microextraction. The sample was extracted with N-octanol using polypropylene hollow fibrous membranes. The extraction was carried out for 20 min at the rate of 600 r·min-1 at 40 ℃. Inertsil ODS-SP C18 chromatographic column was used as stationary phase,and a mixture of methanol and water (82+18) as mobile phase. UV-detection at 220 nm was adopted in the determination. Linear relationships between values of peak area and mass concentration of the 3 herbicides were kept in definite ranges. Detection limits (3S/N) found were ranged from 0.20 to 0.35 μg·L-1. On the sample of surface water,test for recovery was made by standard addition method;values of recovery found were in the range of 90.6%-106%. RSD′s (n=6) of the method found were in the range of 3.1%-6.8%.