Determination of chlorpyrifos,triazophos and profenofos in water by gas chromatography with solid-phase extraction using multi-walled carbon nanotubes as adsorbent

A method based on multi-walled carbon nanotubes as the solid phase extraction material had been developed for the determination of chlorpyrifos,triazophos and profenofos in water by solid phase extraction-gas chromatography.The results showed that these pesticides had a good linearity in the range of 0.005—1.0mg /L and the correlations were greater than 0.9993.The limits of detection were 2.69×10-4—7.43×10-4mg/L.The recoveries rates were between 72.3% and 116.7% with RSD less than 13.6% in 0.005,0.01,0.05mg/kg three different added amount.The method meet the requirements of pesticide residue analysis.