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[Determination of 47 organophosphorus pesticide residues in drinking water by membrane extraction-gas chromatography-PFPD].

OBJECTIVE
To establish a method for the rapid determination of organophosphorus pesticide residues in drinking water by membrane extraction-gas chromatography.


METHODS
The pesticides were extracted from 1000 ml water sample with the activation of the C18 solid disk membrane. Then the extract was eluted by ethyl acetate, dehydrated by anhydrous sodium sulfate, nitrogen at least in 1 ml, set the volume to 1 ml. The volume was 2 microl for injection by gas chromatography.


RESULTS
The spiked recoveries were between 81.8%-122.8%, the RSD were 2.67%-24%, the detection limits of different organophosphorus pesticides were 0.006-0.35 microg/L and the LLOQ were 0.022-1.2 microg/L.


CONCLUSION
The method is simple, rapid, sensitive, repeatable, reliable and suitable for determination of trace organophosphorus pesticide in water.