Abstract
Our previous studies reported that perfluorooctanoic acid (PFOA) contamination decreased in well, tap, and surface water around a fluoropolymer plant in Osaka, Japan, between 2003 and 2016. In this study, we evaluated the degradability of PFOA and perfluorohexanoic acid in river soils to identify the influence of the degradation on the perfluorocarboxylic acids (PFCAs) in the Yodo River Basin. We also investigated the influence of abiotic oxidation on the formation of PFCAs in soils and measured the fluorotelomer alcohols (FTOHs) as precursors of PFCAs in the soil and air samples collected at Osaka and Kyoto. No major degradations were observed in soils contaminated with PFCA during the 24-week experimental period, while the PFOA levels increased only in the control group. The PFCA levels significantly increased after oxidation in this group. The dominant FTOH in soils was 10:2 FTOH, whereas 6:2 FTOH was dominant in the air samples. These findings suggest that PFOA was rapidly removed from water system but persist in soils. Moreover, the results indicate the need to evaluate not only the PFCAs, but also the FTOHs and other precursors for the accurate prediction of PFCA accumulation and fates in the environment.
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Acknowledgements
This study was supported by national university grants from the Kyoto University Graduate School of Medicine and by Fujiwara Memorial Foundation. The funding sources were not involved in conducting this research.
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Funding is provided by Kyoto University and Fujiwara Memorial Foundation.
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PT—reviewing, writing, editing. PL—reviewing, writing, formal analysis, data management. YS—reviewing, writing, formal analysis, data management. BZ—reviewing, writing, formal analysis, data management. AK—conceptualization, data curation, funding acquisition, investigation, methodology, project administration, resources. KHH—conceptualization, supervision, data curation, formal analysis, funding acquisition, investigation, methodology, project administration, resources.
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Thepaksorn, P., Lee, P., Shiwaku, Y. et al. Formation and Degradability of Per- and Polyfluoroalkyl Substances in River Soils around a Fluoropolymer-Manufacturing Plant in Osaka, Japan. Arch Environ Contam Toxicol 84, 427–435 (2023). https://doi.org/10.1007/s00244-023-00998-z
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DOI: https://doi.org/10.1007/s00244-023-00998-z