As found later, this
decrease was due to migration of PAH into LDPE and the measure
of decrease depends on time of interactions and values of diffusion
coefficients of PAH (Šimko, Šimon, Khunová, Karovicˇová, & Drdák,
1994). Chen and Chen (2005) lowered B[a]P content in roasted
duck skin from 3.5 lg/kg to 0.9 lg/kg during 24 h after packaging
into LDPE film.