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

Umeh, Anthony C. and Naidu, Ravi and Shilpi, Sonia and Boateng, Emmanuel B. and Rahman, Aminur and Cousins, Ian T. and Chadalavada, Sreenivasulu ORCID: https://orcid.org/0000-0002-5000-8313 and 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. ISSN 0013-936X


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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 17 Feb 2022 03:10
Last Modified: 18 Feb 2022 02:39
Uncontrolled Keywords: Anion exchange capacity; Charge characteristics; Distribution coefficient; Multiple linear regressions; Positive surface charge; Sorption isotherms; Total Organic Carbon; Variable charge soils
Fields of Research (2008): 05 Environmental Sciences > 0503 Soil Sciences > 050399 Soil Sciences not elsewhere classified
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Fields of Research (2020): 41 ENVIRONMENTAL SCIENCES > 4105 Pollution and contamination > 410599 Pollution and contamination not elsewhere classified
Identification Number or DOI: https://doi.org/10.1021/acs.est.0c07202
URI: http://eprints.usq.edu.au/id/eprint/46144

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