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Sorption of perfluoroalkyl substances (PFASs) to an organic soil horizon - Effect of cation composition and pH.

Abstract：

:Accurate prediction of the sorption of perfluoroalkyl substances (PFASs) in soils is essential for environmental risk assessment. We investigated the effect of solution pH and calculated soil organic matter (SOM) net charge on the sorption of 14 PFASs onto an organic soil as a function of pH and added concentrations of Al3+, Ca2+ and Na+. Often, the organic C-normalized partitioning coefficients (KOC) showed a negative relationship to both pH (Δlog KOC/ΔpH = -0.32 ± 0.11 log units) and the SOM bulk net negative charge (Δlog KOC = -1.41 ± 0.40 per log unit molc g-1). Moreover, perfluorosulfonic acids (PFSAs) sorbed more strongly than perfluorocarboxylic acids (PFCAs) and the PFAS sorption increased with increasing perfluorocarbon chain length with 0.60 and 0.83 log KOC units per CF2 moiety for C3-C10 PFCAs and C4, C6, and C8 PFSAs, respectively. The effects of cation treatment and SOM bulk net charge were evident for many PFASs with low to moderate sorption (C5-C8 PFCAs and C6 PFSA). However for the most strongly sorbing and most long-chained PFASs (C9-C11 and C13 PFCAs, C8 PFSA and perfluorooctane sulfonamide (FOSA)), smaller effects of cations were seen, and instead sorption was more strongly related to the pH value. This suggests that the most long-chained PFASs, similar to other hydrophobic organic compounds, are preferentially sorbed to the highly condensed domains of the humin fraction, while shorter-chained PFASs are bound to a larger extent to humic and fulvic acid, where cation effects are significant.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Campos Pereira H,Ullberg M,Kleja DB,Gustafsson JP,Ahrens L

doi

10.1016/j.chemosphere.2018.05.012

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

183-191

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(18)30854-3

journal_volume

207

pub_type

杂志文章

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