Simultaneous determination for residues of chlorpyrifos, difenoconazole and pyridaben in fruits by gas chromatography with electron capture detector

An analytical method for simultaneous determination of chlorpyrifos, difenoconazole and pyridaben residues in fruits using gas chromatography with electron capture detector (GC-ECD) was developed. The samples were extracted with acetonitrile, and further clean-up on NH2-SPE. It showed that good linearity was obtained from range 0.02 to 1.0 mg/L with correlation coefficients above 0.99. The limits of detection were 0.006-0.007 mg/kg and the limits of quantification were 0.02 mg/kg. Fortified recoveries at 0.02, 0.05 and 0.1 mg/kg were from range 78% to 108% with relative standard deviations (RSDs) from range 2.9% to 16%, respectively.The results showed the method was suitable for the determination of chlorpyrifos, difenoconazole and pyridaben in fruits.