Simultaneous Determination of 22 Phthalate Acid Esters in Edible Oils by Gas Chromatography/Mass Spectrometry Coupled with Gel Permeation Chromatography

A method for the simultaneous determination of 22 phthalate acid esters in edible oils by gas chromatography-mass spectrometry coupled with gel permeation chromatography was developed.The correlation coefficients(R) of 22 phthalate acid esters were over 0.999 with detection limits from 0.09~11.83 mg/kg.The average recoveries of 22 phthalate acid esters in edible oils were ranged from 81.45%~113.90%.In addition,the relative standard deviations(RSDs) were in the range of 1.55%~9.41%.The level of phthalate acid esters plasticizers in edible oils was investigated by this method,and di-iso-butyl phthalate,dibutyl phthalate,bis(2-ethylhexyl) phthalate were found in some real samples.The simplicity,sensitivity and precision of the method made it be well suitable for the analysis of phthalate acid esters in edible oils.