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HERO ID
5097912
Reference Type
Journal Article
Title
The role of surface charge and pH changes in tropical soils on sorption behaviour of per- and polyfluoroalkyl substances (PFASs)
Author(s)
Oliver, DP; Li, Y; Orr, R; Nelson, P; Barnes, M; Mclaughlin, MJ; Kookana, RS
Year
2019
Is Peer Reviewed?
1
Journal
Science of the Total Environment
ISSN:
0048-9697
EISSN:
1879-1026
Volume
673
Page Numbers
197-206
Language
English
PMID
30986679
DOI
10.1016/j.scitotenv.2019.04.055
Web of Science Id
WOS:000466418300022
Abstract
This study investigated the effect of surface charge on the sorption of perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS) onto 7 tropical soils as a function of pH. The net surface charge became less negative with decreasing pH (from 7.5 to 3.5) in all soils. The rate of change in net surface charge varied from -0.6 to -2.8 (cmol/kg)/pH unit. The effect on sorption behaviour of PFASs was variable among soils. For two soils, the average sorption increased 54- and 45-fold for PFOS, 33- and 9-fold for PFOA, and 39- and 400-fold for PFHxS, across the pH range 7.5 to 3.5. Sorption in another sandier soil showed negligible change with decreasing pH. Sorption in the other soils did not change significantly until the pH decreased to approximately 5.5. The soils with high contents of sesquioxides (Fe and Al oxides) showed the most marked increase in sorption with decreasing pH. This study demonstrated that in addition to hydrophobic interactions with OC and other processes, electrostatic interactions are also important in the sorption process for these chemicals in soils. In acidic, variably charged tropical soils there is the possibility that any PFOS, PFOA or PFHxS sorbed to the soils may become desorbed if management practices (e.g. liming) raised soil pH.
Keywords
PFOS; PFOA; Tropical soils; Weathered soils
Tags
PFAS
•
Additional PFAS (formerly XAgency)
•
Expanded PFAS SEM (formerly PFAS 430)
Litsearch: September 2019
PubMed
Not prioritized for screening
Perfluorooctane
•
PFAS 150
Literature Search Update December 2020
PubMed
Literature Search August 2019
PubMed
Not prioritized for screening
Ammonium perfluorooctanoate
Perfluorohexanesulfonic acid
Perfluorooctane
Perfluorooctanesulfonic acid
Perfluorooctanoic acid
•
PFHxS
Database searches
Pubmed
WOS
Scopus
Supplemental
TiAb
Environmental fate or occurrence (including food)
Literature Search Update April 2023
Supplemental
Environmental fate or occurrence (including food)
•
PFOA (335-67-1) and PFOS (1763-23-1)
LitSearch: Feb 2019 - May 2020
PubMed
WoS
Literature Search Update (Apr 2019 - Sep 2020)
PubMed
WOS
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