Journal
METHODS AND PROTOCOLS
Volume 6, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/mps6010010
Keywords
per- and polyfluoroalkyl substances (PFAS); food packaging materials; total fluorine; total organic fluorine; ion selective electrode (ISE)
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This study presents a cost-effective and rapid method for measuring total fluorine and total organic fluorine in food packaging materials. The method involves oxygen combustion sample preparation and analysis using a fluoride ion-selective electrode. Detailed steps from sample preparation to analysis are provided, including critical steps to minimize contamination and interference.
Various testing methods and techniques have been used to identify and quantify per- and polyfluoroalkyl substances (PFAS) in food packaging. A common indirect measurement of PFAS is total fluorine (TF) and total organic fluorine (TOF). These methods are critical in rapidly screening food packaging materials for the >9000 PFAS and are often globally used for regulatory limits. However, this destructive approach requires careful sample preparation, combustion, and the analysis of the solution by a fluoride-specific electrode. The method described herein is a cost-effective, rapid, quantitative, and externally validated initial screening of packaging materials for fluoro-chemistry. This study presents validated protocols for measuring TF and TOF in packaging substrates using oxygen combustion sample preparation coupled with fluoride ion-selective electrode (F-ISE); the materials and required equipment are provided, and the step-by-step procedure from sample preparation to the analysis are described, including critical steps to minimize contamination and interferences during sample preparation.
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