Objective To explore an accurate and rapid pre-processing method for the extraction of chlorothalonil and deltamethrin in drinking water, which were detected by gas chromatography (GC) with capillary column.
Methods Chlorothalonil and deltamethrin in drinking water were extracted once with acetonitrile, separated by OV-1701 capillary column and detected by GC ECD detector.
Results In the detection of chlorothalonil in drinking water, the detection limit was 0.10 μg/L; the RSD were 5.2%~2.5%; the recoveries of standard addition were 96.3%~102.4%. In the detection of deltamethrin in drinking water, the detection limit was 0.47 μg/L; the RSD were 6.0%~4.7%; the recoveries of standard addition were 97.1%~103.4%. The correlation coefficient of chlorothalonil in the range of 0.80~60.00 μg/L was 0.9989 and the correlation coefficient of deltamethrin in the same range was 0.9975.
Conclusion With this pre-processing methods, the recovery and repeatability of chlorothalonil and deltamethrin in drinking water samples detected by GC with capillary column was satisfactory.
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