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Influence of vegetation on heavy metal Cr release process from bottom sediment under unidirectional flows and regular waves.

Authors :
Lou S
Zou Y
Wang H
Zhou F
Liu S
Tu J
Fedorova IV
Source :
Marine pollution bulletin [Mar Pollut Bull] 2024 Jul; Vol. 204, pp. 116535. Date of Electronic Publication: 2024 Jun 03.
Publication Year :
2024

Abstract

As human activities become more intensive, a substantial number of heavy metals are discharged into estuarine or wetland environments. Due to the poor degradability, heavy metals are prone to adsorption and deposition on suspended particles in bottom sediments. Subsequently, under the influence of disturbances, there is a potential for their re-release, causing secondary pollution. To investigate the release process of the heavy metal Cr from sediment, laboratory experiments were conducted under both unidirectional flow and regular wave conditions. At the initial stage, the temporal trends of particulate (Cr <subscript>P</subscript> ) and dissolved (Cr <subscript>D</subscript> ) Chromium concentrations were both characterized by initial increments followed by stabilization and continuous escalation. Vertically, the stable concentrations of Cr <subscript>P</subscript> and Cr <subscript>D</subscript> increased with the presence of vegetation and the enhancement of hydrodynamics. The Elovich equation, pseudo-second-order kinetic equation, Double constant equation (Freundlich model), and parabolic diffusion equation were employed to predict the release process of Cr <subscript>D</subscript> from bottom sediment. The Elovich equation proved most suitable for describing the release process of Cr <subscript>D</subscript> , with an R <superscript>2</superscript> exceeding 0.9. In order to assess the influence of vegetation on the Cr release process, the Stem-Reynolds were introduced to modify the Elovich equation. The final maximum error was 12 % (excluding the initial stage), which was much lower than that using the original Elovich equation (maximum error of 32 %). The study findings provide practical support for estuarine and wetland managers to formulate effective heavy metal management measures, which contribute to the conservation and sustainable management of aquatic ecosystems.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1879-3363
Volume :
204
Database :
MEDLINE
Journal :
Marine pollution bulletin
Publication Type :
Academic Journal
Accession number :
38833948
Full Text :
https://doi.org/10.1016/j.marpolbul.2024.116535