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Assessment and Management of Mercury Leaching from a Riverbank

The South River located in the city of Waynesboro, Virginia, contains mercury (Hg) contamination due to historical releases from an industrial facility operating between 1929 and 1950. In 2015, two sampling events were conducted in two of the contaminated bank regions (Constitution Park and North Pa...

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Autores principales: Ziaei, Hasti, Rao, Balaji, Wood, Tea V., Garza-Rubalcava, Uriel, Alborzi, Ashkan, Zhou, Huayun, Bireta, Paul, Grosso, Nancy, Reible, Danny
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9962584/
https://www.ncbi.nlm.nih.gov/pubmed/36851054
http://dx.doi.org/10.3390/toxics11020179
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author Ziaei, Hasti
Rao, Balaji
Wood, Tea V.
Garza-Rubalcava, Uriel
Alborzi, Ashkan
Zhou, Huayun
Bireta, Paul
Grosso, Nancy
Reible, Danny
author_facet Ziaei, Hasti
Rao, Balaji
Wood, Tea V.
Garza-Rubalcava, Uriel
Alborzi, Ashkan
Zhou, Huayun
Bireta, Paul
Grosso, Nancy
Reible, Danny
author_sort Ziaei, Hasti
collection PubMed
description The South River located in the city of Waynesboro, Virginia, contains mercury (Hg) contamination due to historical releases from an industrial facility operating between 1929 and 1950. In 2015, two sampling events were conducted in two of the contaminated bank regions (Constitution Park and North Park) to evaluate non-particulate total mercury (THg) and methylmercury (MeHg) concentrations in bank interstitial waters during river base flows and during bank drainage after flooding events. Porewater THg and MeHg at the bank–water interface were measured using diffusive gradient in thin-film devices (DGTs). The results showed THg mercury concentrations during bank drainage were approximately a factor of 3 higher than during base flow conditions. To have a better understanding of the parameters that control Hg leaching, a series of laboratory experiments were designed using South River sediments. The field and laboratory assessment showed that drainage/inundation cycles can lead to high THg concentration leachate from contaminated sediment due to increased partitioning from solids under oxic bank conditions and mobilization by the drainage waters. The results also demonstrated that methyl mercury concentrations at the bank–water interface are highest under base flow when conditions are more reduced due to the absence of oxic water exchange with the surface water. A remedial approach was implemented involving partial removal of surficial sediments and placement of biochar (to reduce non-particulate THg) and an armoring layer (to reduce erosion). DGT Measurements after bank stabilization showed THg decreased by a factor of ~200 and MeHg concentration by a factor of more than 20.
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spelling pubmed-99625842023-02-26 Assessment and Management of Mercury Leaching from a Riverbank Ziaei, Hasti Rao, Balaji Wood, Tea V. Garza-Rubalcava, Uriel Alborzi, Ashkan Zhou, Huayun Bireta, Paul Grosso, Nancy Reible, Danny Toxics Article The South River located in the city of Waynesboro, Virginia, contains mercury (Hg) contamination due to historical releases from an industrial facility operating between 1929 and 1950. In 2015, two sampling events were conducted in two of the contaminated bank regions (Constitution Park and North Park) to evaluate non-particulate total mercury (THg) and methylmercury (MeHg) concentrations in bank interstitial waters during river base flows and during bank drainage after flooding events. Porewater THg and MeHg at the bank–water interface were measured using diffusive gradient in thin-film devices (DGTs). The results showed THg mercury concentrations during bank drainage were approximately a factor of 3 higher than during base flow conditions. To have a better understanding of the parameters that control Hg leaching, a series of laboratory experiments were designed using South River sediments. The field and laboratory assessment showed that drainage/inundation cycles can lead to high THg concentration leachate from contaminated sediment due to increased partitioning from solids under oxic bank conditions and mobilization by the drainage waters. The results also demonstrated that methyl mercury concentrations at the bank–water interface are highest under base flow when conditions are more reduced due to the absence of oxic water exchange with the surface water. A remedial approach was implemented involving partial removal of surficial sediments and placement of biochar (to reduce non-particulate THg) and an armoring layer (to reduce erosion). DGT Measurements after bank stabilization showed THg decreased by a factor of ~200 and MeHg concentration by a factor of more than 20. MDPI 2023-02-15 /pmc/articles/PMC9962584/ /pubmed/36851054 http://dx.doi.org/10.3390/toxics11020179 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ziaei, Hasti
Rao, Balaji
Wood, Tea V.
Garza-Rubalcava, Uriel
Alborzi, Ashkan
Zhou, Huayun
Bireta, Paul
Grosso, Nancy
Reible, Danny
Assessment and Management of Mercury Leaching from a Riverbank
title Assessment and Management of Mercury Leaching from a Riverbank
title_full Assessment and Management of Mercury Leaching from a Riverbank
title_fullStr Assessment and Management of Mercury Leaching from a Riverbank
title_full_unstemmed Assessment and Management of Mercury Leaching from a Riverbank
title_short Assessment and Management of Mercury Leaching from a Riverbank
title_sort assessment and management of mercury leaching from a riverbank
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9962584/
https://www.ncbi.nlm.nih.gov/pubmed/36851054
http://dx.doi.org/10.3390/toxics11020179
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