Affiliation:
1. Environmental Science Department, University of Arizona, 429 Shantz Bldg, Tucson, AZ 85721, USA
Abstract
The impact of chain length on the sorption of anionic PFAS by soils and sediments was investigated by aggregating and synthesizing data sets from the literature. Quantitative structure/property relationship (QSPR) analysis was applied to characterize the influence of molecular size and soil properties on sorption. The log of the organic carbon-normalized equilibrium sorption coefficient (Koc) exhibited a biphasic relationship with molar volume, wherein the log Koc values for the short-chain PFAS were generally greater than would be predicted using the QSPR correlation determined for the long-chain PFAS. This enhanced differential sorption is observed to different degrees for all studies, which are compiled and synthesized for the first time. The results reveal remarkable congruency across a wide array of soils comprising a large range of properties and indicate that the observed enhanced differential sorption of short-chain PFAS is a prevalent phenomenon. Aggregating the long-chain PFAS data for all soils and sediments with organic carbon contents > 1% produced a strong correlation, indicating that the resultant QSPR model can produce representative log Koc values irrespective of the other properties of the medium. Silt+clay content was shown to be an important soil component for the short-chain PFAS for most soils, as well as the long-chain PFAS for soils with organic carbon contents < 1%. The results indicate that while the simple Koc-foc approach may produce reasonable estimates of Kd values for long-chain anionic PFAS, particularly for soils and sediments with larger organic carbon contents, it is unlikely to do so for short-chain anionic PFAS.
Funder
Hydrologic Sciences Program of the NSF
Arizona Board of Regents TRIF Program
Subject
General Environmental Science,Renewable Energy, Sustainability and the Environment,Ecology, Evolution, Behavior and Systematics
Reference35 articles.
1. PFAS concentrations in soils: Background levels versus contaminated sites;Brusseau;Sci. Total Environ.,2020
2. EPA (1996). Soil Screening Guidance, User’s Guide Publ. 9355.
3. ECETOC (2023, August 03). Environmental Exposure Assessment of Ionisable Organic Compounds. Technical Report No. 123, European Centre for Ecotoxicology and Toxicology of Chemicals. Available online: https://www.ecetoc.org/publication/tr-123-environmental-risk-assessment-of-ionisable-compounds/.
4. OECD (2018). Considerations for Assessing the Risks of Combined Exposure to Multiple Chemicals, Environment, Health and Safety Division, Environment Directorate. Series on Testing and Assessment No. 296.
5. van Leeuwen, C.J., and Vermeire, T.G. (2007). Risk Assessment of Chemicals: An Introduction, Springer. [2nd ed.].
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献