Cited by 125Per- and polyfluoroalkyl substances researchWastewater Treatment and ReusePharmaceutical and Antibiotic Environmental Impacts

Incidence of Pfas in soil following long-term application of class B biosolids

Pepper, Ian L., Brusseau, Mark L., Prevatt, Frank J., Escobar, Barbara A.·2021·Science of The Total Environment

Abstract

This field study investigated the impact of long-term land application of biosolids on PFAS presence in soils that received annual repetitive land application of Class B biosolids from 1984 to 2019. Soil samples were collected from three depths of 30.5, 91 and 183 cm below land surface. Biosolid and groundwater samples used for irrigation were also collected. Concentrations measured for 18 PFAS compounds were evaluated to assess incidence rates and potential impact on groundwater. No PFAS analytes were detected at the three sampling depths for soil samples collected from undisturbed sites with no history of agriculture, irrigation, or biosolids application (background control sites). Relatively low mean concentrations of PFAS ranging from non-detect to 1.9 μg/kg were measured in soil samples collected from sites that were used for agriculture and that received irrigation with groundwater, but never received biosolids. PFAS concentrations in soils amended with biosolids were similarly low, ranging from non-detect to a mean concentration of 4.1 μg/kg. PFOS was observed at the highest concentrations, followed by PFOA for all locations. PFAS detected in the irrigation water were also present in the soil. These results indicate that biosolids and irrigation water are both important sources of PFAS present in the soils for all of the study sites. Not all PFAS detected in the biosolids were detected in the soil. Very long chain PFAS present in the biosolids were not detected or were detected at very low levels for soil, suggesting potential preferential retention within the biosolids. The precursor NMeFOSAA was present at the second highest concentrations in the biosolids but not detected in soil, indicating possible occurrence of transformation reactions. The total PFAS soil concentrations exhibited significant attenuation with depth, with a mean attenuation of 73% at the 183 cm depth. Monotonically decreasing concentrations with depth were observed for the longer-chain PFAS.

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Crossref · 10.1016/j.scitotenv.2021.148449

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  • Soils near primary sources, such as fluorochemical manufacturing facilities, are at higher risk of PFAS contamination, leading to indirect exposure through secondary pathways.

    “Soils near primary sources, such as fluorochemical manufacturing facilities, are at higher risk of PFAS contamination, leading to indirect exposure through secondary pathways [157,158].”
  • Secondary point sources of soil PFAS contamination include applying fertilizers such as wastewater sludge or compost and irrigating agricultural areas with recycled wastewater.

    “Secondary point sources are more widespread and include practices like applying fertilizers (e.g., wastewater sludge or compost) and irrigating agricultural areas with recycled wastewater [157].”

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Authors
Pepper, I. L., Brusseau, M. L., Prevatt, F. J., & Escobar, B. A.
Affiliations
University of Arizona (US)
Corresponding author
Pepper, Ian L.
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2021-11
Volume
793
Pages
148449
ISSN
0048-9697 (ISSN-L)
OpenAlex
W3174334026
Cited by
125
References
32
Citations by year
2026: 26 · 2025: 35 · 2024: 27 · 2023: 17 · 2022: 20
FWCI
6.05
Type
journal article
Language
en
Open access
closed
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Physical Sciences › Environmental Science › Waste Management and Disposal › Wastewater Treatment and Reuse
  • Physical Sciences › Environmental Science › Pollution › Pharmaceutical and Antibiotic Environmental Impacts
Keywords
PFAS, biosolids, Class B biosolids, land application, soil contamination, groundwater irrigation, PFOS, perfluorooctanoic acid, long-chain PFAS, groundwater contamination
MeSH terms
Biosolids, Fluorocarbons, Soil, Soil Pollutants, Incidence, Groundwater

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