| A method for determining concentrations of chlorothaonil and 6 pyrethroid pesticides in surface water was developed by using GC ECD with capillary column, the contaminants being extracted from surface water by n-hexane. The linear ranges of 7 pesticides were 10.0 μg/L～200 μg/L(chlorothaonil) and 50.0 μg/L～1 000 μg/L(fenpropathrin, cyhalothrin, permethrin, cypermethrin, fenvalerate, deltamethrin).The average recoveries of pesticides by spiking ranged from 91.3% to 118%;RSD ranged from 0.8% to 4.9%. The method detection limits are: chlorothaonil 0.054 μg/L, fenpropathrin 0.62 μg/L, cyhalothrin 0.68 μg/L, permethrin 0.40 μg/L, cypermethrin 0.65 μg/L, fenvalerate 0.78 μg/L, deltamethrin 0.15 μg/L. |
