4.7 Article

Insights into the impacts of dissolved organic matter of different origins on bioaccumulation and translocation of per- and polyfluoroalkyl substances (PFASs) in wheat

Journal

ENVIRONMENTAL POLLUTION
Volume 293, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.118604

Keywords

Per-and polyfluoroalkyl substances (PFASs); Dissolved organic matter (DOM); Bioaccumulation; Wheat; Binding

Funding

  1. Ministry of Science and Technology, China [2018YFC1801003, 2019YFC1804203]
  2. National Science Foundation of China (NSFC) [41991313, 21737003, 22111530176]
  3. Shaanxi Key R&D Program of China [2019ZDLNY01-02-01]
  4. 111 Program
  5. Yangtze River Scholar Program of the Ministry of Education, China [T2017002]
  6. Chinese Universities Scientific Fund [2452021103]
  7. [NSFC 41991313]

Ask authors/readers for more resources

The study revealed that both BSA and HA significantly inhibited the bioaccumulation and translocation of PFASs in wheat roots and shoots, with BSA having a greater impact than HA. The higher binding affinities of the four PFASs with BSA than with HA explained this difference. Additionally, the inhibition impacts of the BSA-HA mixture (1:1) were lower than BSA alone.
Per- and polyfluoroalkyl substances (PFASs) have been found to be widely present in soil. Dissolved organic matter (DOM) in soil are supposed to greatly affect the bioavailability of PFASs in soil. Herein, hydroponic experiments were conducted to understand the impacts of two kinds of typical DOM, bovine serum albumin (BSA) and humic acid (HA), on the uptake and translocation of legacy PFASs and their emerging alternatives, perfluorooctane sulfonic acid (PFOS), perfluorooctane acid (PFOA), perfluorohexane sulfonic (PFHxS) and 6:2 chlorinated polyfluoroalkyl ether sulfonate (6:2 Cl-PFESA) in wheat (Triticum aestivum L.). The results indicated that both HA and BSA significantly inhibited the bioaccumulation and translocation of PFASs in the roots and shoots of wheat, and the impacts of BSA were greater than HA. This difference was explained by the greater binding affinities of the four PFASs with BSA than with HA, as evidenced by the equilibrium dialysis and isothermal titration calorimetry (ITC) analyses. It was noting that inhibition impacts of the BSA-HA mixture (1:1) were lower than BSA alone. The results of Fourier transform infrared (FT-IR) spectroscopy and excitationemission matrix (EEM) fluorescence spectroscopy suggested that HA could bind with the fluorescent tryptophan residues in BSA greatly, competing the binding sites with PFASs and forming a cover on the surface of BSA. As a result, the binding of PFASs with BSA-HA complex was much lower than that with BSA, but close to HA. The results of this study shed light on the impacts of DOM in soil on the bioaccumulation and translocation of PFASs in plants.

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