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OPTIMIZATION OF EXTRACTION METHODS FOR COMPREHENSIVE PROFILING OF PERFLUOROALKYL AND POLYFLUOROALKYL SUBSTANCES IN FIREFIGHTING FOAM IMPACTED SOILS
Munoz, G., P. Ray, S. Mejia-Avendano, S.V. Duy, D.T. Do, J. Liu, and S. Sauve.
Analytica Chimica Acta 1034:74-84(2018)

Data from different lines of evidence indicate that current extraction procedures previously validated with anionic and neutral PFASs may seriously underperform for cationic and zwitterionic PFASs. The extraction efficiency and instrumental response could be strongly matrix-dependent, which might preclude a robust analysis. In a study of a sample preparation procedure for the analysis of anionic, cationic, and zwitterionic PFASs in soil samples, 86 PFASs were evaluated, representing 24 chemical classes associated with aqueous film-forming foam (AFFF) formulations. Methanol with hydrochloric acid provided excellent recoveries for most cationic and zwitterionic PFASs, including fluorotelomer sulfonamidoalkyl betaines (e.g., 6:2 FTAB) and fluorotelomer betaines (e.g., 9:1:2 FTB), yet performed less satisfactorily for certain anionic PFASs and possibly caused conversion of some PFASs. Sequential extractions using methanol with ammonium acetate exhibited limited matrix effects and suitable recoveries of PFASs from soils of diverse textural classes and organic matter content.



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