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Characterizing the interactions between sediment dissolved organic matter and zinc using multispectroscopic

Weiwei Lü1, Xin Yao2, Haoyu Ren3

  • 1School of Environment and Planning, University of Liaocheng, Liaocheng 252000, China; College of Water Science, Beijing Normal University, Beijing 100875, China.

Environmental Pollution (Barking, Essex : 1987)
|February 21, 2020
PubMed
Summary

Sediment dissolved organic matter (DOM) in Lake Dongping shows varied zinc (Zn) binding potential. Macrophyte-dominated DOM exhibits higher Zn binding than other regions, indicating increased humification with Zn addition.

Keywords:
2D-COSDissolved organic matter (DOM)Metal bindingPARAFACZinc

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Area of Science:

  • Environmental Chemistry
  • Aquatic Geochemistry
  • Spectroscopy

Background:

  • Sediment dissolved organic matter (DOM) plays a crucial role in metal binding in aquatic ecosystems.
  • Understanding the heterogeneity of DOM and its interaction with heavy metals is vital for environmental risk assessment.
  • Lake Dongping's distinct regions exhibit varying DOM characteristics influencing metal complexation.

Purpose of the Study:

  • To investigate the binding of zinc (Zn) with different types of DOM from Lake Dongping.
  • To characterize the fluorescent components of DOM and their response to Zn addition.
  • To compare the metal-binding potential of DOM from various lake regions.

Main Methods:

  • Principal Component Analysis (PCA) to delineate lake regions based on DOM parameters.
  • Multispectroscopic techniques, including Excitation-Emission Matrix (EEM) fluorescence and Parallel Factor Analysis (PARAFAC), to identify DOM components.
  • Synchronous Fluorescence (SF) spectra and 2D Correlation Spectroscopy (2D-COS) to analyze Zn-DOM interactions.

Main Results:

  • Three fluorescent DOM components were identified: humic-like (1 and 3) and protein-like (2).
  • Protein-like components dominated DOM in the river entrance, open lake, and tourism areas, while humic-like components prevailed in the macrophyte-dominated region.
  • Zinc addition suppressed protein-like fluorescence and enhanced humic-like fluorescence, with higher effective quenching constants (log K) for protein-like components in macrophyte-dominated DOM, indicating greater binding affinity.

Conclusions:

  • DOM from the macrophyte-dominated region of Lake Dongping exhibits a higher potential for binding zinc compared to other areas.
  • Zinc addition promotes the humification of DOM across all studied regions.
  • The findings highlight the importance of DOM composition in determining metal bioavailability and fate in freshwater systems.