Reciprocal influence of per- and polyfluoroalkyl substances (PFAS) and soil organic matter on their fate in soils
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View abstract on PubMed
Summary
This summary is machine-generated.Per- and polyfluoroalkyl substances (PFAS) accumulate in soils, impacting soil organic matter (SOM). PFAS sorption depends on SOM hydrophobicity, while PFAS alter dissolved organic matter (DOM) quality and quantity, affecting soil carbon storage.
Area Of Science
- Environmental Chemistry
- Soil Science
- Organic Geochemistry
Background
- Per- and polyfluoroalkyl substances (PFAS) global accumulation in soils poses risks to soil quality.
- The influence of soil organic matter (SOM) quality on PFAS sorption and the reciprocal effects of PFAS on SOM dynamics are not well understood.
Purpose Of The Study
- To investigate the reciprocal impacts of PFAS and SOM on each other's environmental fate.
- To understand how SOM quality affects PFAS sorption and how PFAS influence SOM characteristics, including dissolved organic matter (DOM) quantity and quality.
Main Methods
- Sorption experiments of three PFAS (PFOS, PFOA, PFBA) in three distinct soils.
- Analysis of dissolved organic matter (DOM) mobilization and characterization using <sup>13</sup>C and <sup>1</sup>H NMR spectroscopy.
- Quantification of PFAS sorption percentages and assessment of SOM components like polycyclic aromatic hydrocarbons (PAHs).
Main Results
- PFOS exhibited the highest sorption (61-98%), followed by PFOA and PFBA, with sorption driven by hydrophobic SOM components, especially those containing PAHs.
- PFAS presence increased DOM release in soils with less hydrophobic SOM, with changes influenced by soil component chemistry.
- <sup>1</sup>H NMR revealed PFAS altered DOM structure, increasing hydrophobic and decreasing hydrophilic constituents.
Conclusions
- PFAS sorption is strongly linked to SOM hydrophobicity.
- PFAS can alter both the quantity and quality of SOM, potentially impacting soil carbon sequestration and long-term soil health.
- Understanding these reciprocal interactions is crucial for assessing the environmental risks of PFAS contamination.
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