Sorption behaviour of per- and polyfluoroalkyl substances (PFASs) in tropical soils

Oliver, Danielle P., Li, Yasong, Orr, Ryan, Nelson, Paul, Barnes, Mary, McLaughlin, Michael J., and Kookana, Rai S. (2020) Sorption behaviour of per- and polyfluoroalkyl substances (PFASs) in tropical soils. Environmental Pollution, 258. 113726.

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Abstract

The sorption behaviour of three perfluoroalkyl substances (PFASs), namely perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS), was determined on 28 tropical soils. Tropical soils are often highly weathered, richer in sesquioxides than temperate soils and may contain variable charge minerals. There are little data on sorption of PFASs in tropical soils. The highest Kd values were found for PFOS with mean values ranging from 0 to 31.6 L/kg. The Kd values for PFOA and PFHxS ranged from 0 to 4.9 L/kg and from 0 to 5.6 L/kg, respectively. While these values are in the range of literature sorption data, the average Kd values for PFOS and PFOA from the literature were 3.7 times and 3.6 times higher, respectively, than those measured in this study. Stepwise regression analysis did explain some of the variance, but with different explanatory variables for the different PFASs. The main soil properties explaining sorption for PFOS and PFOA were oxalate-extractable Al and pH, and for PFHxS was pH.

Item ID: 62091
Item Type: Article (Research - C1)
ISSN: 1873-6424
Keywords: PFOS; PFOA; PFHxS; Sorption; Tropical soils; Weathered soils
Copyright Information: Crown Copyright © 2019 Published by Elsevier Ltd. All rights reserved. Accepted Version: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date Deposited: 03 Mar 2020 23:49
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050304 Soil Chemistry (excl Carbon Sequestration Science) @ 100%
SEO Codes: 96 ENVIRONMENT > 9612 Rehabilitation of Degraded Environments > 961208 Rehabilitation of Degraded Urban and Industrial Environments @ 50%
96 ENVIRONMENT > 9614 Soils > 961407 Urban and Industrial Soils @ 50%
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