Determination of 20 organochlorine and pyrethroid pesticides residues in water by dispersive liquid-liquid microextraction
In this study,a method for the determination of 20 organochlorine and pyrethroid pesticide residues in drinking water was established by dispersive liquid-liquid microextraction(DLLME).The influencing factors related to DLLME extraction were optimized by expanding the extraction of pesticide residues in water by expanding dispersive liquid-liquid microextraction:0.4 mL of chloroform and 4 mL of acetonitrile were used as extractants and dispersants for 40 mL of water samples,extracted and centrifuged and dried with nitrogen,and 100 μL of n-hexane solvent was replaced by gas chromatography electron capture detector(GC-ECD)for detection.The results showed that the linearity of 20 organochlorine and pyrethroid pesticides in water was good in the concentration range of 0.002-0.10 μg·mL-1 and 0.01-0.20 μg·mL-1,respectively,the correlation coefficient was 0.998,and the detection limit of the method was 0.001-0.002 μg·L-1,the enrichment folds of the method were 168-206,the recoveries of the high,medium and low concentrations were 83.30％-116.70％,and the relative standard deviation(RSD)was 0.84％-9.87％.The established method was used to test 135 rural drinking water samples,and the results were below the limit values.This method has high sensitivity,accuracy,good stability,and is more operable in batch analysis,and is suitable for the qualitative and quantitative analysis of organochlorine and pyrethroid in drinking water.
万方数据
维普
