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目的建立水中有机磷农药残留的圆盘膜萃取-气相色谱-串联质谱快速测定方法。方法将1000 ml水样用活化了的C18固相圆盘膜萃取,用10 ml乙酸乙酯洗脱,无水硫酸钠脱水,氮吹至少于1 ml,定容至1 ml,进样1μl,气相色谱仪-串联质谱测定。结果本法加标回收率为75.1%~117.9%,方法精密度(RSD)为0.5%~26.3%,检出限为1.5#10-6~1.1#10-2μg/L,定量下限为5.0×10-6~3.66×10-2μg/L之间。结论该法简单、快速、准确、灵敏,结果重现性好,定性结果可靠,适用于水中痕量有机磷农药的测定。
Objective To establish a rapid method for the determination of organophosphorus pesticide residues in water by disk-membrane extraction-gas chromatography-tandem mass spectrometry. Methods 1000 ml of water sample was extracted with activated C18 solid-phase disk membrane, eluted with 10 ml of ethyl acetate, dehydrated with anhydrous sodium sulfate, diluted to 1 ml with nitrogen and diluted to 1 ml with 1 ml of nitrogen. Gas chromatography - tandem mass spectrometry. Results The recovery of this method was 75.1% ~ 117.9%, the method precision was 0.5% ~ 26.3%, the detection limit was 1.5 # 10-6 ~ 1.1 # 10-2μg / L and the limit of quantitation was 5.0 × 10-6 ~ 3.66 × 10-2μg / L. Conclusion The method is simple, rapid, accurate, sensitive and reproducible. It has good qualitative results and is suitable for the determination of trace organophosphorus pesticides in water.