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Article: Tidal induced dynamics and geochemical reactions of trace metals (Fe, Mn, and Sr) in the salinity transition zone of an intertidal aquifer

TitleTidal induced dynamics and geochemical reactions of trace metals (Fe, Mn, and Sr) in the salinity transition zone of an intertidal aquifer
Authors
KeywordsBiogeochemical reactions
Iron (Fe)
Manganese (Mn)
Salinity transition zone
Strontium (Sr)
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/scitotenv
Citation
Science of the Total Environment, 2019, v. 664, p. 1133-1149 How to Cite?
AbstractBiogeochemical reactions in an intertidal aquifer influences the submarine groundwater discharge (SGD) associated trace metal flux to the ocean. Tidal fluctuation greatly affects the physical mixing, and biogeochemical transformation of trace metals in the intertidal aquifer. This study presents the dynamics of trace metals (Fe, Mn, and Sr) and the production of Fe2+- in the salinity transition zone is discovered. The variations of Fe2+ are led by the shifts of both physical mixing and biogeochemical reaction during tidal fluctuation. The transformation from amorphous Fe(OH)(3) to FeS is the main reason fur the enrichment of Fe2+ in the zone with a salinity of 0.5-10. Mn behaves much less active than Fe in the intertidal aquifer due to the very limited Mn in the solid phase and the major driving force of Mn2+ variation is the physical mixing rather than geochemical reaction. SC2'''' behaves conservatively and shows a synchronous with salinity in the salinity transition zone. This study found that Fe2 precipitates in a form not limited to Fe (hydro)oxides and the FeS minerals is the most possible form of precipitation in reduced aquifers. In that case, only a small part of Fe2 discharges to the sea associated with SGD, but Mn2+ has a comparatively conseivative property during the transport in the intertidal aquifer and majority of the Mn2+ originated from fresh groundwater will discharge with SGD in this study. The biogeochemical transformation pathways of Fe and Mn observed in this study provides insights into the cycles of Fe and Mn in an intertidal aquifer, which is of significance to accurately estimate the SGD derived Fe and Mn fluxes to the ocean. (C) 2019 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/274941
ISSN
2017 Impact Factor: 4.61
2015 SCImago Journal Rankings: 1.702
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLiu, Y-
dc.contributor.authorNot, CA-
dc.contributor.authorJiao, JJJ-
dc.contributor.authorLiang, W-
dc.contributor.authorLu, M-
dc.date.accessioned2019-09-10T02:32:04Z-
dc.date.available2019-09-10T02:32:04Z-
dc.date.issued2019-
dc.identifier.citationScience of the Total Environment, 2019, v. 664, p. 1133-1149-
dc.identifier.issn0048-9697-
dc.identifier.urihttp://hdl.handle.net/10722/274941-
dc.description.abstractBiogeochemical reactions in an intertidal aquifer influences the submarine groundwater discharge (SGD) associated trace metal flux to the ocean. Tidal fluctuation greatly affects the physical mixing, and biogeochemical transformation of trace metals in the intertidal aquifer. This study presents the dynamics of trace metals (Fe, Mn, and Sr) and the production of Fe2+- in the salinity transition zone is discovered. The variations of Fe2+ are led by the shifts of both physical mixing and biogeochemical reaction during tidal fluctuation. The transformation from amorphous Fe(OH)(3) to FeS is the main reason fur the enrichment of Fe2+ in the zone with a salinity of 0.5-10. Mn behaves much less active than Fe in the intertidal aquifer due to the very limited Mn in the solid phase and the major driving force of Mn2+ variation is the physical mixing rather than geochemical reaction. SC2'''' behaves conservatively and shows a synchronous with salinity in the salinity transition zone. This study found that Fe2 precipitates in a form not limited to Fe (hydro)oxides and the FeS minerals is the most possible form of precipitation in reduced aquifers. In that case, only a small part of Fe2 discharges to the sea associated with SGD, but Mn2+ has a comparatively conseivative property during the transport in the intertidal aquifer and majority of the Mn2+ originated from fresh groundwater will discharge with SGD in this study. The biogeochemical transformation pathways of Fe and Mn observed in this study provides insights into the cycles of Fe and Mn in an intertidal aquifer, which is of significance to accurately estimate the SGD derived Fe and Mn fluxes to the ocean. (C) 2019 Elsevier B.V. All rights reserved.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/scitotenv-
dc.relation.ispartofScience of the Total Environment-
dc.subjectBiogeochemical reactions-
dc.subjectIron (Fe)-
dc.subjectManganese (Mn)-
dc.subjectSalinity transition zone-
dc.subjectStrontium (Sr)-
dc.titleTidal induced dynamics and geochemical reactions of trace metals (Fe, Mn, and Sr) in the salinity transition zone of an intertidal aquifer-
dc.typeArticle-
dc.identifier.emailNot, CA: cnot@hku.hk-
dc.identifier.emailJiao, JJJ: jjiao@hku.hk-
dc.identifier.authorityNot, CA=rp02029-
dc.identifier.authorityJiao, JJJ=rp00712-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.scitotenv.2019.01.374-
dc.identifier.pmid30901786-
dc.identifier.scopuseid_2-s2.0-85061389636-
dc.identifier.hkuros302731-
dc.identifier.volume664-
dc.identifier.spage1133-
dc.identifier.epage1149-
dc.identifier.isiWOS:000460245600107-
dc.publisher.placeNetherlands-

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