Determination of 18 Phthalate Acid Esters in Soya Bean Milk Using the Modified QuEChERS Sample Preparation Method and Gas Chromatography-Mass Spectrometry
This work reports a rapid,specific and sensitive multi-residue method based on the Quick Easy Cheap Effective Rugged and Safe(QuEChERS) sample preparation method and gas chromatography with mass spectrometry detection in the selected ion monitoring mode(GC-MS-SIM) using isotope internal standard for the routine analysis of 18 phthalate acid esters(PAEs) in Soya bean milk.Matrix effect and QuEChERS methods was carefully investigated.Soya bean milk was extracted by acetonitrile,then cleaned-up using solid phase extraction with mixed sorbents of anhydrous magnesium sulfate,PSA,LCC18 and Envi-carb.18 PAEs showed good linearity with all R2 higher than 0.9976.The recovery and relative standard devition(RSD) were 84.6％-101.1％ and 2.1％ 5.8％,respectively.The method was sensitive with the detection limits lower than 0.05 mg/kg (S/N =3).The developed method has been proved to be convenient,time-saving,environmental-friendly,accurate and sensitive.
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