Sorption of PFOS in 114 Well-Characterized Tropical and Temperate Soils: Application of Multivariate and Artificial Neural Network Analyses
Article
Article Title | Sorption of PFOS in 114 Well-Characterized Tropical and Temperate Soils: Application of Multivariate and Artificial Neural Network Analyses |
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ERA Journal ID | 4674 |
Article Category | Article |
Authors | Umeh, Anthony C. (Author), Naidu, Ravi (Author), Shilpi, Sonia (Author), Boateng, Emmanuel B. (Author), Rahman, Aminur (Author), Cousins, Ian T. (Author), Chadalavada, Sreenivasulu (Author), Lamb, Dane (Author) and Bowman, Mark (Author) |
Journal Title | Environmental Science and Technology |
Journal Citation | 55 (3), pp. 1779-1789 |
Number of Pages | 11 |
Year | 2021 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 0013-936X |
1520-5851 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acs.est.0c07202 |
Web Address (URL) | https://pubs.acs.org/doi/10.1021/acs.est.0c07202 |
Abstract | The influence of soil properties on PFOS sorption are not fully understood, particularly for variable charge soils. PFOS batch sorption isotherms were conducted for 114 temperate and tropical soils from Australia and Fiji, that were well-characterized for their soil properties, including total organic carbon (TOC), anion exchange capacity, and surface charge. In most soils, PFOS sorption isotherms were nonlinear. PFOS sorption distribution coefficients (Kd) ranged from 5 to 229 mL/g (median: 28 mL/g), with 63% of the Fijian soils and 35% of the Australian soils showing Kd values that exceeded the observed median Kd. Multiple linear regression showed that TOC, amorphous aluminum and iron oxides contents, anion exchange capacity, pH, and silt content, jointly explained about 53% of the variance in PFOS Kd in soils. Variable charge soils with net positive surface charges, and moderate to elevated TOC content, generally displayed enhanced PFOS sorption than in temperate or tropical soils with TOC as the only sorbent phase, especially at acidic pH ranges. For the first time, two artificial neural networks were developed to predict the measured PFOS Kd (R2 = 0.80) in the soils. Overall, both TOC and surface charge characteristics of soils are important for describing PFOS sorption. |
Keywords | Anion exchange capacity; Charge characteristics; Distribution coefficient; Multiple linear regressions; Positive surface charge; Sorption isotherms; Total Organic Carbon; Variable charge soils |
ANZSRC Field of Research 2020 | 410599. Pollution and contamination not elsewhere classified |
Byline Affiliations | University of Newcastle |
Stockholm University, Sweden | |
Department of Defence, Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6z18/sorption-of-pfos-in-114-well-characterized-tropical-and-temperate-soils-application-of-multivariate-and-artificial-neural-network-analyses
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