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Fate of a perfluoroalkyl acid mixture in an agricultural soil studied in lysimeters
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 52019 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 223, p. 180-187Article in journal (Refereed) Published
Abstract [en]

Perfluoroalkyl acids (PFAAs) are environmental contaminants of concern in both food and drinking water. PFAA fate in agricultural soil is an important determinant of PFAA contamination of groundwater and crops. The fate of C4-C14 perfluorinated carboxylic acids (PFCAs) and two perfluorinated sulfonic acids (PFSAs) in an agricultural soil was studied in a field lysimeter experiment. Soil was spiked with PFAAs at four different levels and crops were planted. PFAA concentrations in soil were measured at the beginning and end of the growing season. Lysimeter drainage water was collected and analysed. The concentrations of all PFAAs decreased in the surface soil during the growing season, with the decrease being negatively correlated with the number of fluorinated carbons in the PFAA molecule. PFAA transfer to the drainage water was also negatively correlated with the number of fluorinated carbons. For the C11-C14 PFCAs most of the decrease in soil concentration was attributed to the formation of non-extractable residues. For the remaining PFAAs leaching was the dominant removal process. Leaching was concentration dependent, with more rapid removal from the soils spiked with higher PFAA levels. Model simulations based on measured K-d values under-predicted removal by leaching. This was attributed to mixture effects that reduced PFAA sorption to soil.

Place, publisher, year, edition, pages
2019. Vol. 223, p. 180-187
Keywords [en]
PFAA, Soil, Leaching, Sorption, Mixture effect
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-169290DOI: 10.1016/j.chemosphere.2019.02.012ISI: 000465054600021PubMedID: 30776763OAI: oai:DiVA.org:su-169290DiVA, id: diva2:1320568
Available from: 2019-06-05 Created: 2019-06-05 Last updated: 2019-06-05Bibliographically approved

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