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Binding strength of mercury (II) to different dissolved organic matter: The roles of DOM properties and sources TEXT SIZE: A A A
Dissolved organic matter (DOM) influences the environmental fate and toxic effects of trace metals such as mercury (Hg). However, because of limits in DOM analytical techniques and lack of sample diversity in past studies, it remains unclear whether the binding strength of DOM complexed with Hg(II) is related to the DOM properties. In this study, different DOM isolates (n = 26) from various sources were used to determine the conditional stability constant (logK) of DOM-Hg complexes using the equilibrium dialysis ligand exchange (EDLE) method. UV-Vis and fluorescence spectrometry were used to evaluate the correlation between logK values and DOM properties, such as chromophoric moieties, aromaticity, and molecular weight. Results demonstrated that the DOM from different sources presented an extensive range of binding strengths to Hg(II), because of their heterogeneous properties. Moreover, DOM chromophores, including aromaticity and molecular weight, are critical indicators of the DOM-Hg affinity in ambient-relevant circumstances. Significantly, higher terrestrial DOM led to greater DOM-Hg affinity. Additionally, this study supports that UV-Vis and fluorescence spectroscopy can be used to estimate DOM composition and its binding strength with Hg(II). Furthermore, the observed relationship between logK and DOM properties provided a possible pathway of explanation for the spatial co-variations between Hg(II) concentrations and DOM characters observed in previous field investigations. (C) 2021 Elsevier B.V. All rights reserved.

Publication name

 SCIENCE OF THE TOTAL ENVIRONMENT Volume807 Part3 Article Number150979 DOI10.1016/j.scitotenv.2021.150979 PublishedFEB 10 2022

Author(s)

 Wang, Yuqin; Liu, Jiang; Van Liem-Nguyen; Tian, Shanyi; Zhang, Siqi; Wang, Dingyong; Jiang, Tao

Corresponding author(s) 

 JIANG Tao 
 jiangtower666@163.com  
 Southwest Univ, Coll Resources & Environm, Interdisciplinary Res Ctr Agr Green Dev Yangtze R, Chongqing 400716, Peoples R China

Author(s) from IGCAS   LIU Jiang

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