John Wiley & Sons, Ltd.

Uptake of perfluoroalkyl acids in the leaves of coniferous and deciduous broad‐leaved trees

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Analytical methods for determining perfluoroalkyl acids (PFAAs) in leaves were developed to quantify a suite of analytes in both coniferous and deciduous broad‐leaved trees. Sodium hydroxide‐methanol and solid‐phase extraction was selected as extracting and cleaned‐up strategy for PFAAs analysis. Ten perfluorocarboxylic acids (PFCAs) and four perfluorosulfonic acids (PFSAs) were monitored in seven kinds of leaves grown in the urban areas of Dalian, China. Results show that the coniferous tree leaves uptake more PFAAs than the broad‐leaved tree leaves, with the highest amount of 150 ng/g in the pine needles. And leaf PFCAs levels were much higher than PFSAs. Short carbon chain PFCAs with 3–6 perfluorinated carbons account for approximately 40–80% of the total leaf PFAAs amount, where the uptake decreased with the increasing carbon chain length. Temporal observation in leaf PFAAs revealed no significant variation of PFAAs concentrations in the leaves over weekly interval, and the absence of significant seasonal change in pine needle, and sophora. The present study provides some evidence for the accumulation mode of PFAAs in leaves, which is valuable for the understanding of their environmental behavior and the development of alternative bioindicator. This article is protected by copyright. All rights reserved

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