More than half of the tests were done on food contact paper, including 138 wrappers for sandwiches or burgers, 68 wrappers for dessert or bread, and 42 wrappers for Tex-Mex foods.
Overall, 46 percent of paper wrappers tested positive for PFASs. This included 38 percent of sandwich and burger wrappers, 56 percent of bread or dessert wrappers and 57 percent of wrappers for Tex-Mex food, researchers report online February 1 in Environmental Science and Technology Letters.
Tests of 30 samples from paper cups didn’t turn up any of these chemicals. But in tests of 25 other beverage containers, 16 percent did have PFASs.
Researchers also did more extensive testing on a subset of 20 samples to see what types of PFASs were in the food packaging. Six of these samples contained a type of PFASs called PFOA (perfluorooctanoic acid, or C8) that many U.S. manufacturers voluntarily stopped using in 2011 due to concerns about the potential health risks.