SPE followed by HPLC for the sensitive determination of organic phosphorus pesticides in environmental water

A solid-phase extraction(SPE) method followed by the high-performance liquid chromatography(HPLC) was established for the determination of organic phosphorus pesticides in environmental water samples.Water samples were filtered twice with 0.22 μm membrane.C18 solid phase extraction was used for the enrichment of organic phosphorus pesticides.The compounds were eluted by acetonitrile.The eluent was analyted by HPLC directly.The experimental results showed that the scope of the work curve of methyl parathion were 2.0-80 μg/L、 fenitrothion 3.0-80 μg/L、 parathion 3.0-100 μg/L、 phoxim 5.0-100 μg/L;the limit of detection(LOD) of methyl parathion,fenitrothion parathion phoxim were 0.11 μg/L、 0.52 μg/L、 0.45 μg/L、 0.85 μg/L,respectively.and recoveries were 84.2% 102.2%.The method is simple,fast,low-cost,high recovery rate and enrichment factor,and so it is suitable to the detection of organic phosphorus residues in environmental water samples.