| Migration investigations were carried out on typical antioxidant and plasticizer 3-tert-butyl-4-hydroxyanisole(BHA),2,6-di-tert-butyl-4-methylphenol(BHT) and dicyclohexyl phthalate(DCP) with the modified polyphenylene oxide(also referred to as Tenax TA) as the dry food simulant.Two types of paperboard samples,kraftpaper and lvory board,were selected to take part in a series of designed migration tests under different temperatures with different times,in order to obtain the migration behaviors of three migrants.The migration results implied that for almost all of organic compounds,their migrations underwent two steps including firstly adsorption of the released compounds from paperboard,secondly desorption of migrant from Tenax TA.During the first stage,the big pore size in paperboard microstructures and weak interaction between migrants and paper fiber could lead to high migration rate of the migrants,eventually resulted in the high adsorption efficiency of the simulant.However,when the adsorption reached an equilibrium between migrants and simulant,prolonging of the migration time would trigger desorption of migrant from the simulants,and resulted in the reduction of migration efficiency.A screening test for forty five kinds of paper packaging materials was implemented,and the results demonstrated that BHA and DCP were presented in two types of the paper packaging materials,and the migration levels were 0.027 μg/dm2 and 0.81 μg/dm2,respectively,smaller than the specific migration limits regulated in the European Commission Directive. |