Solid-phase Extraction and Gas Chromatography forDetermination of Carfentrazone-ethyl Residue in Water

The solid-phase extraction (SPE) and gas chromatography connected with electron-capture detector (GC-ECD) was used for determination of carfentrazone-ethyl residue in water.Several key parameters that influence the SPE performance were studied.The results showed that good recovery was obtained using 3 mL ethyl-acetate as the eluent and the sample volume was 500 mL at pH 7.0.The fortified recovery of carfentrazone-ethyl at concentration of 0.1,0.5 and 2.0 μg/L was in the range of 81.45%~108.7%,with the RSD of 0.74%~1.5%.The limit of detection of carfentrazone-ethyl in water was 0.02 μg/L.The established method was applied to detect two environmental water samples (tap water and river water) and the results showed that there was no detectable carfentrazone-ethyl residue in the samples.Furthermore,the fortified recovery of carfentrazone-ethyl in the tap water and river water at 0.5 μg/L was 93.8% and 79.9%,with RSD of 1.3% and 8.0% respectively.The results showed that this method was suitable for detecting carfentrazone-ethyl in environmental water samples.