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Sorption of PFOS isomers on goethite as a function of pH, dissolved organic matter (humic and fulvic acid) and sulfate
Örebro University, School of Science and Technology. (Man-Technology-Environment Research Centre (MTM))
Örebro University, School of Science and Technology. (Man-Technology-Environment Research Centre (MTM))ORCID iD: 0000-0001-6800-5658
Örebro University, School of Science and Technology. (Man-Technology-Environment Research Centre (MTM))ORCID iD: 0000-0002-2674-4994
2019 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 233, p. 896-904Article in journal (Refereed) Published
Abstract [en]

Understanding the distribution of PFOS isomers between the aqueous phase and goethite is crucial, since it is an abundant sorbent and thus may have a large influence on the mobility of PFOS. This study was conducted to understand the effects of pH, humic acid (HA), fulvic acid (FA) and sulfate on sorption of PFOS isomers. The results will increase the understanding about what parameters may control the fate and transport of PFOS in surface and ground water.

The study was conducted by adding PFOS spiked water to a goethite slurry with different aqueous chemistry. Levels of total PFOS and PFOS isomers were quantified using an Ultra-Performance Liquid Chromatograph coupled to a triple quadrupole mass spectrometer. Results showed that sorption of PFOS was mainly dependent on pH; sorption decreased as pH increased. Presence of HA increased log K-d from 1.29 to 2.03, 1.76 to 1.92 and 1.51 to 1.96 at pH 5.50-7.50 for 3-/4-/4-PFOS, 6-/2-PFOS and L-PFOS, respectively. Changes in the aqueous chemistry also affected the behaviour of PFOS as the addition of Na2SO4 enhanced the sorption of PFOS. Results showed that L-PFOS was more readily sorbed to goethite at pH < 4.35 both in the presence and in the absence of humic or fulvic acids. At pH > 4.5 the 3-/4-/5-PFOS isomer group was more associated to goethite. Besides electrostatic interactions, which controlled the sorption of PFOS, this study indicate that the presence of dissolved humic substances in the aqueous phase enhances the sorption via hydrophobic mechanisms.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 233, p. 896-904
Keywords [en]
Goethite, Perfluorooctane sulfonate, Sorption, Humic substances, Electrostatic and hydrophobic interactions
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:oru:diva-75699DOI: 10.1016/j.chemosphere.2019.05.252ISI: 000477691500099PubMedID: 31340417Scopus ID: 2-s2.0-85067315052OAI: oai:DiVA.org:oru-75699DiVA, id: diva2:1342871
Funder
Knowledge Foundation, 20160019Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-14Bibliographically approved

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Yeung, Leo W. Y.Bäckström, Mattias

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Uwayezu, Jean-NoelYeung, Leo W. Y.Bäckström, Mattias
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