Glass migration cells were prepared fixing a 0.40 dm2 round piece of paperboard between a spiked round piece of donor paper and covered with 2 g of the food simulant Tenax1, on its food contact side. The donor paper (0.40 dm2) was previously spiked with 100 ml of a mixture of all even n-alkanes, from C10 to C40 50 mg l1 in n-heptane each, and allowed to dry under a fume-hood for 3 min.