Abstract: To establish a method of QuEChERS-gas chromatography-mass spectrometry for detection of the 15 kinds of pesticide residues in edible vegetable oil. The sample was extracted and purified by QuEChERS method, extracted with acidified acetonitrile, purified by PSA and C18 matrix dispersion, simultaneously measured by the selected ion mode, and quantified by external standard method. The results showed that the good linear ranges of 15 pesticides were 0.050 0~0.500 0 μg/mL and the correlation coefficients were 0.995 3~0.999 3. The average recoveries were in the range of 83.4%~106.8%. The relative standard deviations were between 2.4% and 4.8%. The limits of quantification were in range of 0.030~0.088 μg/mL. The method is simple, accurate, and rapid, and it can meet the needs of simultaneous detection of 15 pesticide residues in vegetable oil.

Key words: QuEChERS, gas chromatography-mass spectrometry, vegetable oil, pesticide residues