Development of a Novel Method to Measure Per- and Polyfluoralkyl Substances in Paper and Textiles
Dr. Graham Peaslee and Dr. Paul DeYoung
Per- and polyfluoroalkyl substances (PFASs) are chemical compounds used as powerful, long-lived surfactants in many consumer products. Because of the environmental persistence of PFASs, their ability to bioaccumulate, and their suspected human toxicity, new methods to identify these chemicals in consumer products are needed. Current techniques to measure PFASs involve liquid chromatography-tandem mass spectrometry (LC-MS/MS) which requires significant time and expense per sample for analysis. Particle Induced gamma-ray emission (PIGE) spectroscopy is an established ion beam analysis method that utilizes a beam of accelerated protons to excite 19F nuclei in a sample. As these nuclei return to their ground state, they emit characteristic gamma rays that can be used to identify and quantify the total fluorine content in a sample. In this study, paper and textile samples were analyzed with LC-MS/MS, paired with the total oxidizable precursor (TOP) assay, and with PIGE. A set of PFAS reference standards were created by depositing known amounts of perfluorooctanoic acid onto filter paper, and these standards were used to determine the fluorine concentration on papers and textiles. In addition, preliminary results suggest that the contact angle of water on paper is roughly associated with the presence of PFAS. A comparison of these results reveals that PIGE is an effective tool to determine the presence or absence of PFASs added to these consumer products.
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