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Sorption of perfluoroalkyl substances to two types of minerals
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
Swedish Univ Agr Sci SLU, Dept Aquat Sci & Assessment, Box 7050, SE-75007 Uppsala, Sweden.;Geol Survey Sweden, Villavagen 18, SE-75236 Uppsala, Sweden..
Harwell Oxford, Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England..
Swedish Univ Agr Sci SLU, Dept Aquat Sci & Assessment, Box 7050, SE-75007 Uppsala, Sweden..
2016 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 159, 385-391 p.Article in journal (Refereed) Published
Abstract [en]

The sorption of perfluoroalkyl substances (PFASs) was investigated for two model soil mineral surfaces, alumina (Al2O3) and silica (SiO2), on molecular level using neutron scattering. The PFASs were selected (i.e. perfluorohexanoic acid (PFHxA), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA), and perfluorooctane sulfonic acid (PFOS)) to examine the role of hydrophobic chain length and hydrophilic functional group on their sorption behaviour. All four PFASs were found to sorb to alumina surface (positively charged) forming a hydrated layer consisting of 50% PFASs. The PFAS solubility limit, which decrease with chain length, was found to strongly influence the sorption behaviour. The sorbed PFAS layer could easily be removed by gentle rinsing with water, indicating release upon rainfall in the environment. No sorption was observed for PFOA and PFOS at silica surface (negatively charged), showing electrostatic interaction being the driving force in the sorption process.

Place, publisher, year, edition, pages
2016. Vol. 159, 385-391 p.
Keyword [en]
Perfluoroalkyl substances (PFASs), Sorption, Neutron reflection, Mineral, Alumina, Silica
National Category
Other Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-303025DOI: 10.1016/j.chemosphere.2016.06.016ISI: 000380417800047PubMedID: 27323291OAI: oai:DiVA.org:uu-303025DiVA: diva2:970776
ÅForsk (Ångpanneföreningen's Foundation for Research and Development)
Available from: 2016-09-14 Created: 2016-09-14 Last updated: 2016-09-14Bibliographically approved

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