Sorption of Perfluorooctane sulfonate (PFOS) including its isomers on hydrargillite as a function of pH, humic substances and Na2SO4

Uwayezu, Jean-Noel; Yeung, Leo W. Y.; Bäckström, Mattias

doi:10.1016/j.jes.2021.03.041

Cited by 10 publications

(14 citation statements)

References 38 publications

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“…The raw water used to perform sorption experiment was collected from Lake Vättern (south of Stora Hammarsundet). Physicochemical properties of Lake Vättern water is provided in our previous publications (Uwayezu et al, 2019, Uwayezu et al, 2022. Four different soils were sampled in Kvarntorp, Kumla, Sweden.…”

Section: Methodsmentioning

confidence: 99%

“…Spiked solutions used in sorption experiments were prepared following procedures published in our recent works (Uwayezu et al, 2019, Uwayezu et al, 2022. Briefly, 3 mg of PFOS salt containing linear and branched isomers was dissolved in 25 L of Lake Vättern water and mixed using a stirrer to ensure complete dissolution.…”

Section: Batch Testsmentioning

confidence: 99%

“…pH was adjusted to between 2.5 and 11 using either HCl or NaOH. The rationale behind the selection of levels of added chemicals was discussed in details in our previous studies (Uwayezu et al, 2019, Uwayezu et al, 2022. Previous studies have shown that sorption of PFOS to soil particles reached equilibrium in 24 h (Milinovic et al, 2015;Campos Pereira et al, 2018).…”

Section: Batch Testsmentioning

confidence: 99%

“…Managing bioavailability of PFAS in soil requires a clear understanding of PFAS mobilization and their interactions with different soil components. The authors acknowledge previous efforts done to help understand the effect of different parameters such as increased PFAS sorption as pH decreases (Campos-Pereira et al, 2020;Gagliano et al, 2020;Lu et al, 2016;Uwayezu et al, 2019, Uwayezu et al, 2022, increasing PFAS sorption in presence of dissolved organic carbon (Higgins and Luthy, 2006;Uwayezu et al, 2019;Gagliano et al, 2020), enhancement of PFAS sorption in the presence of divalent metal cations (Wang et al, 2012), decreased sorption in the presence of anions (Uwayezu et al, 2019;Schulz et al, 2020) and the contribution of soil minerals (Milinovic et al, 2015;Li et al, 2018;Liu et al, 2020;Nguyen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…However, soils contain dissolved natural organic matters and other inorganic substances, which could affect the soil capacity governing the mobility of PFOS isomers. Our previous studies have shown that dissolved humic substances and sulfate may affect the distribution of PFOS isomers to goethite and hydrargillite (Uwayezu et al, 2019, Uwayezu et al, 2022. Currently, it is not fully understood how substances present in soils affect the transport of PFOS isomers in soils.…”

Section: Introductionmentioning

confidence: 99%

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Sorption of Perfluorooctane Sulfonic Acid Including Its Isomers to Soils: Effects of pH, Natural Organic Matter and Na2SO4

Uwayezu

Yeung

Bäckström

2022

Front. Environ. Chem.

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Perfluorooctane sulfonic acid (PFOS) has been produced in large quantities for the use in various applications. As a consequence, PFOS is ubiquitous in the environment. Managing transportation of PFOS requires a clear understanding of PFOS mobilization in soils and their interactions with different soil components. The current study investigated a pH-dependent sorption of PFOS isomers onto soil and the effect of dissolved humic substances and Na2SO4. Sorption experiments of PFOS isomers was conducted on top and subsoils to assess their capacity to retain PFOS. Topsoil and subsoil samples were sampled from two areas in Kvarntorp, Kumla, Sweden. Sorption experiments were performed by shaking a mixture of soil and soil solutions spiked with PFOS isomers. One way ANOVA showed that linear PFOS (L-PFOS) and branched PFOS (Br-PFOS) isomers showed different sorption behavior onto soils. Calculated logarithmic partition coefficients revealed that L-PFOS is readily sorbed onto soils sampled at area 1) at very low pH (<4.5) whereas it was the least sorbed onto soils collected at area 2) under the studied pH range. Electrostatic interactions governed the sorption of PFOS isomers during acidic conditions whereas other mechanism controlled the sorption during neutral to alkaline conditions. The presence of humic acid enhanced the sorption of all PFOS isomers whereas fulvic acid inhibited their sorption onto soil. Sorption results revealed that the topsoil had a high capacity to sorb all PFOS isomers compared to the subsoil from the same area. For soils collected from an area covered by young oak trees, a high sorption on the topsoil was attributed to a high organic content [measured as loss on ignition (LOI)] and cation exchange capacity (CEC). However, there was no correlation between sorption capacity and LOI or CEC content for soil collected from another area covered by spruce forest. This suggested that the sorption on latter soils was controlled by other physicochemical properties.

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Section: Methodsmentioning

confidence: 99%

Section: Batch Testsmentioning

confidence: 99%