Unravelling metal mobility under complex contaminant signatures
Metals are concerning pollutants in estuaries, where contamination can undergo significant remobilisation driven by physico-chemical forcing. Environmental concentrations of metals in estuarine sediments are often higher than natural backgrounds, but show no contiguity to potential sources. Thus, be...
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| Veröffentlicht in: | The Science of the total environment 2018-05, Vol.622-623, p.373-384 |
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| creator | de Souza Machado, Anderson Abel Spencer, Kate L. Zarfl, Christiane O'Shea, Francis T. |
| description | Metals are concerning pollutants in estuaries, where contamination can undergo significant remobilisation driven by physico-chemical forcing. Environmental concentrations of metals in estuarine sediments are often higher than natural backgrounds, but show no contiguity to potential sources. Thus, better understanding the metal mobility in estuaries is essential to improve identification of pollution sources and their accountability for environmental effects. This study aims to identify the key biogeochemical drivers of metal mobilisation on contaminated estuarine sediments through (1) evaluation of the potential mobilisation under controlled conditions, and (2) investigation of the relevance of metal mobilisation for in situ pollution levels in an area with multiple contaminant sources. Sediments from a saltmarsh adjacent to a coastal landfill, a marina, and a shipyard on the Thames Estuary (Essex, UK) were exposed in the laboratory (24h, N=96, 20°C) to water under various salinity, pH, and redox potential. Major cations, Fe(II), and trace metal concentrations were analysed in the leachate and sediment. Salinity, pH and redox had a significant effect on metal mobilisation (p |
| doi_str_mv | 10.1016/j.scitotenv.2017.11.239 |
| format | Article |
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[Display omitted]
•Laboratory experiments and field survey were performed for pollution assessment.•Contaminated sediments leached significant amounts of metals to overlying water.•Metal mobilisation varied ~1000-fold depending on sediment pH, salinity, and redox.•Metal mobility affected concentration in sediment and contamination signatures.•Assessment of metal mobility in estuarine sediments is essential to infer environmental impacts.</description><identifier>ISSN: 0048-9697</identifier><identifier>EISSN: 1879-1026</identifier><identifier>DOI: 10.1016/j.scitotenv.2017.11.239</identifier><identifier>PMID: 29216472</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>Coastal landfill ; Contaminant mixtures ; Estuaries ; Pollution assessment ; Sediment geochemistry</subject><ispartof>The Science of the total environment, 2018-05, Vol.622-623, p.373-384</ispartof><rights>2017 Elsevier B.V.</rights><rights>Copyright © 2017 Elsevier B.V. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c420t-d1567207b31b34981d7516f6a019c8a63c094176680e065c9539649b135a82d73</citedby><cites>FETCH-LOGICAL-c420t-d1567207b31b34981d7516f6a019c8a63c094176680e065c9539649b135a82d73</cites><orcidid>0000-0001-6969-7430</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.scitotenv.2017.11.239$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,777,781,3537,27905,27906,45976</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/29216472$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>de Souza Machado, Anderson Abel</creatorcontrib><creatorcontrib>Spencer, Kate L.</creatorcontrib><creatorcontrib>Zarfl, Christiane</creatorcontrib><creatorcontrib>O'Shea, Francis T.</creatorcontrib><title>Unravelling metal mobility under complex contaminant signatures</title><title>The Science of the total environment</title><addtitle>Sci Total Environ</addtitle><description>Metals are concerning pollutants in estuaries, where contamination can undergo significant remobilisation driven by physico-chemical forcing. Environmental concentrations of metals in estuarine sediments are often higher than natural backgrounds, but show no contiguity to potential sources. Thus, better understanding the metal mobility in estuaries is essential to improve identification of pollution sources and their accountability for environmental effects. This study aims to identify the key biogeochemical drivers of metal mobilisation on contaminated estuarine sediments through (1) evaluation of the potential mobilisation under controlled conditions, and (2) investigation of the relevance of metal mobilisation for in situ pollution levels in an area with multiple contaminant sources. Sediments from a saltmarsh adjacent to a coastal landfill, a marina, and a shipyard on the Thames Estuary (Essex, UK) were exposed in the laboratory (24h, N=96, 20°C) to water under various salinity, pH, and redox potential. Major cations, Fe(II), and trace metal concentrations were analysed in the leachate and sediment. Salinity, pH and redox had a significant effect on metal mobilisation (p<0.001), e.g. under certain conditions Fe(II) leaching was increased ~1000-fold. Measurements in situ of surface and subsurface sediment cores revealed that landfill proximity poorly explained metal spatial distribution. However, physicochemical parameters explained up to 97% of geochemically normalized metal concentrations in sediments. Organic matter and pH were dominant factors for most of the metal concentrations at the sediment surface. At subsurface, major cations (Ca, Na, Mg and K) were determinant predictors of metal concentrations. Applying the empirical model obtained in the laboratory to geochemical conditions of the studied saltmarsh it was possible to demonstrate that Fe mobilisation regulates the fate of this (and other) metal in that area. Thus, present results highlight the importance of metal mobility to control sediment pollution and estuarine fate of metals.
[Display omitted]
•Laboratory experiments and field survey were performed for pollution assessment.•Contaminated sediments leached significant amounts of metals to overlying water.•Metal mobilisation varied ~1000-fold depending on sediment pH, salinity, and redox.•Metal mobility affected concentration in sediment and contamination signatures.•Assessment of metal mobility in estuarine sediments is essential to infer environmental impacts.</description><subject>Coastal landfill</subject><subject>Contaminant mixtures</subject><subject>Estuaries</subject><subject>Pollution assessment</subject><subject>Sediment geochemistry</subject><issn>0048-9697</issn><issn>1879-1026</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkEtPwzAQhC0EouXxFyBHLgleJ7bjE6oQLwmJC5wtx9kiV4lTbKeCf0-qll7Zy1xmZ3Y_Qq6BFkBB3K6KaF0aEvpNwSjIAqBgpToic6ilyoEycUzmlFZ1roSSM3IW44pOI2s4JTOmGIhKsjm5-_DBbLDrnP_Mekymy_qhcZ1LP9noWwyZHfp1h9-T-mR6541PWXSf3qQxYLwgJ0vTRbzc6zn5eHx4v3_OX9-eXu4Xr7mtGE15C1xIRmVTQlNWqoZWchBLYSgoWxtRWqoqkELUFKngVvFSiUo1UHJTs1aW5-Rml7sOw9eIMeneRTvdbTwOY9SgJKfAOd9a5c5qwxBjwKVeB9eb8KOB6i09vdIHenpLTwPoid60ebUvGZse28PeH67JsNgZcHp14zBsg9BbbF1Am3Q7uH9LfgFqI4RQ</recordid><startdate>20180501</startdate><enddate>20180501</enddate><creator>de Souza Machado, Anderson Abel</creator><creator>Spencer, Kate L.</creator><creator>Zarfl, Christiane</creator><creator>O'Shea, Francis T.</creator><general>Elsevier B.V</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0001-6969-7430</orcidid></search><sort><creationdate>20180501</creationdate><title>Unravelling metal mobility under complex contaminant signatures</title><author>de Souza Machado, Anderson Abel ; Spencer, Kate L. ; Zarfl, Christiane ; O'Shea, Francis T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c420t-d1567207b31b34981d7516f6a019c8a63c094176680e065c9539649b135a82d73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Coastal landfill</topic><topic>Contaminant mixtures</topic><topic>Estuaries</topic><topic>Pollution assessment</topic><topic>Sediment geochemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>de Souza Machado, Anderson Abel</creatorcontrib><creatorcontrib>Spencer, Kate L.</creatorcontrib><creatorcontrib>Zarfl, Christiane</creatorcontrib><creatorcontrib>O'Shea, Francis T.</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>The Science of the total environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>de Souza Machado, Anderson Abel</au><au>Spencer, Kate L.</au><au>Zarfl, Christiane</au><au>O'Shea, Francis T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unravelling metal mobility under complex contaminant signatures</atitle><jtitle>The Science of the total environment</jtitle><addtitle>Sci Total Environ</addtitle><date>2018-05-01</date><risdate>2018</risdate><volume>622-623</volume><spage>373</spage><epage>384</epage><pages>373-384</pages><issn>0048-9697</issn><eissn>1879-1026</eissn><abstract>Metals are concerning pollutants in estuaries, where contamination can undergo significant remobilisation driven by physico-chemical forcing. Environmental concentrations of metals in estuarine sediments are often higher than natural backgrounds, but show no contiguity to potential sources. Thus, better understanding the metal mobility in estuaries is essential to improve identification of pollution sources and their accountability for environmental effects. This study aims to identify the key biogeochemical drivers of metal mobilisation on contaminated estuarine sediments through (1) evaluation of the potential mobilisation under controlled conditions, and (2) investigation of the relevance of metal mobilisation for in situ pollution levels in an area with multiple contaminant sources. Sediments from a saltmarsh adjacent to a coastal landfill, a marina, and a shipyard on the Thames Estuary (Essex, UK) were exposed in the laboratory (24h, N=96, 20°C) to water under various salinity, pH, and redox potential. Major cations, Fe(II), and trace metal concentrations were analysed in the leachate and sediment. Salinity, pH and redox had a significant effect on metal mobilisation (p<0.001), e.g. under certain conditions Fe(II) leaching was increased ~1000-fold. Measurements in situ of surface and subsurface sediment cores revealed that landfill proximity poorly explained metal spatial distribution. However, physicochemical parameters explained up to 97% of geochemically normalized metal concentrations in sediments. Organic matter and pH were dominant factors for most of the metal concentrations at the sediment surface. At subsurface, major cations (Ca, Na, Mg and K) were determinant predictors of metal concentrations. Applying the empirical model obtained in the laboratory to geochemical conditions of the studied saltmarsh it was possible to demonstrate that Fe mobilisation regulates the fate of this (and other) metal in that area. Thus, present results highlight the importance of metal mobility to control sediment pollution and estuarine fate of metals.
[Display omitted]
•Laboratory experiments and field survey were performed for pollution assessment.•Contaminated sediments leached significant amounts of metals to overlying water.•Metal mobilisation varied ~1000-fold depending on sediment pH, salinity, and redox.•Metal mobility affected concentration in sediment and contamination signatures.•Assessment of metal mobility in estuarine sediments is essential to infer environmental impacts.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>29216472</pmid><doi>10.1016/j.scitotenv.2017.11.239</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0001-6969-7430</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Coastal landfill Contaminant mixtures Estuaries Pollution assessment Sediment geochemistry |
| title | Unravelling metal mobility under complex contaminant signatures |
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