A deterministic quantitative method for the determination of 6 plasticizers(PAEs) and 14 polycyclic aromatic hydrocarbons(PAHs) in edible oils by gas chromatography-series mass spectrometry(GCMS/MS) was established. The sample was preperaed by methylene chloride-acetone (V∶V, 1∶1), vortex extraction(2 000 r/min) 30 s, and ultrasonic extraction for 8 min, 10 000 r/min centrifugation 5 min. When the liquid solution is fully separate, the sample is placed at -20 ℃ for 60 min to remove fat, spray dry with low-temperature nitrogen gas, and dissolve in 2 mL dichloromethane. 20 persistent pollutants were simultaneously detected by qualitative and quantitative analysis of keeping time and specific ion under MRM mode and external standard method. The results show that the 20 targets are well linear in the 5-200 μg/L range, and the linear correlation coefficients are all greater than 0.995. The recovery rate of standard addition at three levels are 51.34%-116.2%, and the relative standard deviation is 0.9%-12.1%. Both PAEs and PAHs were detected to different degrees, compared with the 12.5% excess rate of benzopyrene(a) pyrene(BaP) in China. The method is simple, rapid, accurate and has less interference. It is suitable for the detection of edible oil plasticizer and polycyclic aromatic hydrocarbons.
LIU Xiaoxiao
,
ZHANG Jingjing
,
LI Chenxi
,
WU Fuxiang
,
JI Liangliang
,
DING Hui
,
PENG Tao
. Determination of 20 persistent pollutants in edible oil byfreeze-degreasing-GCMS/MS[J]. Food and Fermentation Industries, 2020
, 46(5)
: 292
-298
.
DOI: 10.13995/j.cnki.11-1802/ts.021039
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