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<p>Large-scale estuaries of Tumenjiang River, Liaohe River, Yellow River, Huaihe River, Changjiang River, and Zhujiang River in the north-west Pacific are confronted with latent heavy metal pollution. Here, we revealed copper pollution behavior and fate by copper(II)-binding with dissolved organic matter combined with fluorescence and 2-dimensional correlation spectra. Seven components were identified from titrants. Free amino acid-like, tryptophan-like, microbial-derived humic-like, polycyclic aromatic hydrocarbon-like, and fulvic-like occurred in all estuaries, whereas the latter two components were absent in the Tumenjiang River Estuary. Humic-like existed only in the Tumenjiang River Estuary, and D’tryptophan-like in the Yellow River Estuary. Polycyclic aromatic hydrocarbon-like exhibited a strong sensitivity of copper(II)-binding in Liaohe River, Changjiang River, and Zhujiang River estuaries, so did humic-like, microbial-derived humic-like, and free amino acid-like, respectively in Tumenjiang River, Yellow River, and Huaihe River estuaries. These findings would be conducive to a further comprehension of copper(II) environmental behaviors and preventing its ecological risks.</p><p></p>

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Complexation between copper(II)-dissolved organic matter shows heavy metal pollution in large-scale estuaries in the north-west Pacific

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月22日

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  • Benxin Yu,
  • Dongping Liu,
  • Zhipeng Yao,
  • Fang Yang,
  • Hongjie Gao,
  • Zhaoyong Bian

摘要

Large-scale estuaries of Tumenjiang River, Liaohe River, Yellow River, Huaihe River, Changjiang River, and Zhujiang River in the north-west Pacific are confronted with latent heavy metal pollution. Here, we revealed copper pollution behavior and fate by copper(II)-binding with dissolved organic matter combined with fluorescence and 2-dimensional correlation spectra. Seven components were identified from titrants. Free amino acid-like, tryptophan-like, microbial-derived humic-like, polycyclic aromatic hydrocarbon-like, and fulvic-like occurred in all estuaries, whereas the latter two components were absent in the Tumenjiang River Estuary. Humic-like existed only in the Tumenjiang River Estuary, and D’tryptophan-like in the Yellow River Estuary. Polycyclic aromatic hydrocarbon-like exhibited a strong sensitivity of copper(II)-binding in Liaohe River, Changjiang River, and Zhujiang River estuaries, so did humic-like, microbial-derived humic-like, and free amino acid-like, respectively in Tumenjiang River, Yellow River, and Huaihe River estuaries. These findings would be conducive to a further comprehension of copper(II) environmental behaviors and preventing its ecological risks.