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Forskningsartikel2016Vetenskapligt granskad

Sorption of perfluoroalkyl substances to two types of minerals

Hellsing, Maja S.; Josefsson, Sarah; Hughes, Arwel V.; Ahrens, Lutz


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. (C) 2016 Elsevier Ltd. All rights reserved.


Perfluoroalkyl substances (PFASs); Sorption; Neutron reflection; Mineral; Alumina; Silica

Publicerad i

2016, Volym: 159, sidor: 385-391