Determination of 7 Phthalates in Vegetable Oil by GC-MS

A GC-MS method was developed for the determination of 7 phthalates in vegetable oil. The sample was extracted with n-hexane and then cleaned up by a Cleanert PAE solid-phase extraction column with the mixture of ethyl acetate and n-hexane as the mobile phase. The eluent was dried by nitrogen and dissolved in acetonitrile. The solution was separated on a DB-5 capillary column. EI-SIM was adopted in MS detection. The linear range of the mass concentration of the 7 phthalates was 0.1-5.0 mg·L-1,with detection limit of 0.02 mg·kg-1. The recovery rates measured by standard addition method were in the range of 80.0%-120%,with RSD was in the range of 1.1%-5.4%.