GC Determination of Di-(2-Ethyl-Hexyl) Adipate as a Plastizizer in PVC Fresh-keeping Film for Food Package

The plasticizer,di-(2-ethyl-hexyl) adipate (DEHA) together with the PVC fresh-keeping film was dissolved with cyclohexanone,and separated from PVC by precipitation of the latter by adding absolute ethanol.The filtrate was diluted to 100 mL with absolute ethanol and used for GC determination.The HP-5-capillary chromatographic column (15 m×0.32 mm,0.25 μm) was used and worked according to the prescribed program of temperature elevation from 140 ℃ to 270 ℃,and the output signal was recorded.Retention time of the chromatographic peak was used in qualitative analysis and standard curve was used in quantitative analysis.Detection limit (3S/N) of the method found was 0.9 mg·L-1.Values of recovery obtained were in the range of 96.8% to 101.4%,and value of relative standard deviation (n=5) obtained were 1.1%.