GC Determination of Migration of 14 Benzene Compounds in Food Contact Materials and Their Migration Rules with Head Space

5.0 mL of food simulant was taken, and then appropriate amount of sodium chloride and 50 μL of DMA were added. GC was applied to the determination of migration of 14 benzene compounds in the solution with head space. The equilibrium temperature and time of head space were set at 80℃ and 30min. The analytes were separated on DB-WAX chromatographic column (30 m×0.32 mm, 0.25 μm) and detected by FID. Linear relationships between values of peak area and mass fraction of the 14 benzene compounds were kept in the same range of 0.005-0.500 mg·kg^-1, with detection limits (3S/N) in the range of 0.78-1.08 μg·kg^-1 and lower limits of determination (10S/N) in the range of 2.62-3.59 μg·kg^-1. On the base of blank sample, test for recovery was made by standard addition method; values of recovery found were in the range of 83.1%-113%, with RSDs (n=6) of recovery amounts in the range of 2.4%-9.9%. Migration rules of the 14 benzene compounds in food contact materials of PS, AS and ABS under different simulants, different time and different temperature were investigated. It was found that benzene compounds migrated more easily to simulants with high content of ethanol (simulant), longer simulated time and higher simulated temperature.