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Many food contact materials (FCMs) and reusable plastics in the food industry contain poly- and perfluoroalkyl substances (PFAS), a group of synthetic pollutants that are known to be potentially harmful for wildlife, humans, and the environment. PFAS may migrate from FCMs to food consumed by humans. As a replacement for plastics, often paper and other plant-based materials are used in commercial settings. This also applies to drinking straws, where plant-based and other presumably eco-friendly straws are increasingly used to reduce plastic pollution. In order to make these materials water-repellent, PFAS are added during manufacturing but can also already be present early in the supply chain due to the use of contaminated raw materials. In the present study, we examined the PFAS concentrations in 39 different brands of straws, made from five materials (i.e. paper, bamboo, glass, stainless steel, and plastic) commercially available on the Belgian market. We combined both targeted and suspect-screening approaches to evaluate a wide range of PFAS. PFAS were found to be present in almost all types of straws, except for those made of stainless steel. PFAS were more frequently detected in plant-based materials, such as paper and bamboo. We did not observe many differences between the types of materials, or the continents of origin. The presence of PFAS in plant-based straws shows that they are not necessarily biodegradable and that the use of such straws potentially contributes to human and environmental exposure of PFAS.

Assessment of poly- and perfluoroalkyl substances (PFAS) in commercially available drinking straws using targeted and suspect screening approaches