using the MIGRATEST1EXP version 2011 software (FABES,2003) and for diffusion coefficients lower than 1025 cm2 s1 using AKTS software (AKTS). Both softwares use numerical algorithms for migration calculation. For the calculation LDPE plaques of 3 mm thickness with a NPs loading of 0.1% (1000 mg kg1) was assumed. Additionally, storage condition of 10 days at 40 8C and KP,F = 1 was assumed.