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Evaluation of the effects of PFAS soil adsorption and transformation in the presence of divalent cations under ambient conditions

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doi: 10.1002/rem.21635
Authors:Eberle, Michael; Edelman, Michael; Denly, Elizabeth; Rabah, Nidal
Author Affiliations:Primary:
TRC Environmental Corporation, Philadelphia, PA, United States
Volume Title:Remediation (New York, NY)
Source:Remediation (New York, NY), 30(1), p.15-25. Publisher: John Wiley & Sons, New York, NY, United States. ISSN: 1051-5658
Publication Date:2019
Note:In English. 16 refs.; illus., incl. 6 tables
Summary:A bench-scale study was conducted to evaluate the effect of divalent cations on the adsorption of perfluoroalkyl and polyfluoroalkyl substances (PFAS) onto soil particles. The study entailed batch testing of a synthetic soil mixture under a range of Epsom salt (soluble magnesium sulfate heptahydrate) concentrations. The synthetic soil was produced using a mix of sand, silt, clay, and organic matter that then was mixed and saturated with water collected from a PFAS-impacted water source. The results indicate that variable concentrations of magnesium (divalent cation) had a minor effect on the sorption of perfluorooctane sulfonate with the highest sorption occurring in the strongest solution of Epsom salt. An unanticipated result of the test involved apparent biomediated transformation of polyfluorinated alkylated sulfonates (fluorotelomers or FTS) to perfluorooctanoic acid, perfluoroheptanoic acid (PFHpA), and perfluorononanoic acid. We believe this is the first time the complete transformation of 6:2 FTS to PFHpA has been observed and reported under ambient surface water-like conditions within 6 months, a relatively short timeframe. Abstract Copyright (2019), Wiley Periodicals, Inc.
Subjects:Adsorption; Alkaline earth metals; Cations; Clay minerals; Concentration; Experimental studies; Kaolinite; Laboratory studies; Magnesium; Metals; Mixing; Natural attenuation; Oxidation; PH; Pollution; Rates; Reactivity; Salinity; Saturation; Sheet silicates; Silicates; Soils; Solubility; Sorption; Toxic materials; Transformations; Fluorotelomers; Perfluoroalkyl substances; Perfluorocarboxylic acid; Perfluorooctane sulfonate; Perfluorooctanoic acid; Polyfluoroalkyl substances
Record ID:869737-4
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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