Sorption of PFOS in 114 Well-Characterized Tropical and Temperate Soils: Application of Multivariate and Artificial Neural Network Analyses

Article


Umeh, Anthony C., Naidu, Ravi, Shilpi, Sonia, Boateng, Emmanuel B., Rahman, Aminur, Cousins, Ian T., Chadalavada, Sreenivasulu, Lamb, Dane and Bowman, Mark. 2021. "Sorption of PFOS in 114 Well-Characterized Tropical and Temperate Soils: Application of Multivariate and Artificial Neural Network Analyses." Environmental Science and Technology. 55 (3), pp. 1779-1789. https://doi.org/10.1021/acs.est.0c07202
Article Title

Sorption of PFOS in 114 Well-Characterized Tropical and Temperate Soils: Application of Multivariate and Artificial Neural Network Analyses

ERA Journal ID4674
Article CategoryArticle
AuthorsUmeh, 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 TitleEnvironmental Science and Technology
Journal Citation55 (3), pp. 1779-1789
Number of Pages11
Year2021
PublisherAmerican Chemical Society
Place of PublicationUnited States
ISSN0013-936X
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.

KeywordsAnion exchange capacity; Charge characteristics; Distribution coefficient; Multiple linear regressions; Positive surface charge; Sorption isotherms; Total Organic Carbon; Variable charge soils
ANZSRC Field of Research 2020410599. Pollution and contamination not elsewhere classified
Byline AffiliationsUniversity of Newcastle
Stockholm University, Sweden
Department of Defence, Australia
Institution of OriginUniversity of Southern Queensland
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