Abstract
We used 14 C-radiolabelling to study the non-extractable residues (NERs) formation of tetrabromobisphenol A (TBBPA) in a humic acid (HA) suspension under catalysis of laccase in the presence of copper. When entering the suspension after TBBPA adsorbing to HA supramolecular associates, Cu2+ at low concentrations (even without toxicity to laccase) significantly reduced the amount and first-order kinetic constant of the NER formation, while Cu2+ had no significant effect on the formation after it was complexed with HA. The inhibition effect of Cu2+ on the NER formation is explained to be attributed to the prevention of laccase-induced oxidation of TBBPA in the voids of HA associates by complexation of Cu2+ with periphery molecules of the associates. The results provide insights into varying effects of heavy metals on the environmental fate of organic contaminants and suggest that co-existing heavy metals could increase their environmental risk by reducing their NER formation.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (Grant No. 2021YFA0910300), National Natural Science Foundation of China (NSFC) (No. 31861133003, 21607071), Fujian Department of Science and Technology (No. 2021J05107), and Quanzhou Bureau of Science and Technology (No. 2020CT002).
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Zhou, Y., Jiang, B., Wang, Y. et al. Effect of Cu2+ on the Laccase-Inducted Formation of Non-Extractable Residues of Tetrabromobisphenol A in Humic Acids. Bull Environ Contam Toxicol 109, 1162–1166 (2022). https://doi.org/10.1007/s00128-022-03602-7
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DOI: https://doi.org/10.1007/s00128-022-03602-7