Silver release from nano-silver containing plastic food containers

A. Mackevica, M.E. Olsson and S.F. Hansen
Technical University of Denmark, DK

Keywords: nano-silver, migration, food containers


The potential migration of nano-silver from consumer products such as e.g. food contact materials has been poorly addressed; however, it is essential for the purpose of human and environmental exposure assessment. In this study, total amount of silver and the migration rates into three different food simulants (Milli-Q water, 10% ethanol,and 3% acetic acid) for 10 days at 40°C was investigated for four brands of commercially available plastic food storage containers. The total content of silver in the containers was determined by ICP-MS and resulting concentrations varied from 13 to 42 µg/g. The highest migration was observed in the acetic acid food simulant for all four brands of containers, with total silver release ranging from 1.9 to 3.1 ng/cm2 after 10 days. Further analysis(TEM imaging, single particle ICP-MS) is essential for obtaining the sizes of particles in the products and migration solutions, and distinguishing between silver in dissolved and particulate fraction. Moreover, experiments reflecting multiple-use are needed to reflect the long-term silver emissions, which can be used for consumer and environmental exposure assessment.