Evidence of compost contamination with per- and polyfluoroalkyl substances (PFAS) from “compostable” food serviceware

Author:

Goossen Caleb P.1ORCID,Schattman Rachel E.2ORCID,MacRae Jean D.3ORCID

Affiliation:

1. Maine Organic Farmers and Gardeners Association 1 , P.O. Box 170, Unity, Maine 04988

2. School of Food and Agriculture, University of Maine, 2 5722 Deering Hall, Orono, Maine 04469

3. Department of Civil and Environmental Engineering, University of Maine 3 , 5711 Boardman Hall, Orono, Maine 04469

Abstract

Per- and polyfluoroalkyl substances (PFAS) have been used to waterproof and greaseproof food serviceware for decades. Health concerns about these compounds have drawn attention to the potential for contamination of the food system. Finished compost (n = 3) made from manure and food serviceware labeled “compostable” generated at a large fair was found to contain 12 or 13 of the 28 PFAS compounds sampled for, in concentrations ranging from 1.1 to 183 μg/kg (Σ28PFAS range = 209–455 μg/kg). Of note, perfluorooctanoic acid, a known carcinogen, was found at concentrations between 47.2 and 55.5 μg/kg. In contrast, fresh manure contained only perfluoroctanesulfonic acid at 3.7 μg/kg, and separated food waste from the fair composted with grass clippings and livestock bedding had no detectable PFAS in 2022, and Σ28PFAS = 9.6 μg/kg in 2019. Including compostable serviceware in compost likely contaminates the finished compost and threatens surrounding groundwater and surface waters, in addition to increasing potential crop uptake.

Publisher

American Vacuum Society

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Materials Science,Biomaterials,General Chemistry

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