Determination of five acylpyrazole pesticide residues in edible vegetable oils using gas chromatography-negative chemical ionization-mass spectrometry

doi:10.3724/SP.J.1123.2018.10009

Abstract

Abstract:

A method was established for the determination of five acylpyrazole pesticide residues in edible vegetable oils using gas chromatography-negative chemical ionization-mass spectrometry (GC-NCI-MS). The pesticides were extracted from a sample with acetonitrile under freezing conditions. A simple cleanup step known as QuEChERS was then conducted. After being identified by GC-NCI-MS, the extracts were quantified using an external standard method that employs a matrix correction standard curve. The linearity of the method was good between 20 and 1000 μg/L, and all limits of quantification were less than 2 μg/kg. Recoveries of all pesticides were in the range of 82.7%-112.4% at the three spiked levels of 0.01, 0.02, and 0.05 mg/kg, and all relative standard deviations were not more than 12.3%. Therefore, this method can be used to determine the residues of acylpyrazole pesticides in edible vegetable oils.

Key words: acylpyrazole pesticides, edible vegetable oils, gas chromatography-mass spectrometry (GC-MS), negative chemical ionization (NCI)

CLC Number:

O658

SHEN Weijian, WU Bin, WANG Hong, WANG Xiaoyan, YU Keyao, LU Huiyuan, HU Guoshen, LI Jingjing. Determination of five acylpyrazole pesticide residues in edible vegetable oils using gas chromatography-negative chemical ionization-mass spectrometry[J]. Chinese Journal of Chromatography, 2019, 37(1): 27-31.

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