Biogeochemical Mechanisms of Selenium Exchange between Water and Sediments in Two Contrasting Lentic Environments

The biogeochemical mechanisms of Se exchange between water and sediments in two contrasting lentic environments were assessed through examination of Se speciation in the water column, porewater, and sediment. High-resolution (7 mm) vertical profiles of

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Veröffentlicht in:	Environmental science & technology 2011-04, Vol.45 (7), p.2605-2612
Hauptverfasser:	Martin, Alan J, Simpson, Stephanie, Fawcett, Skya, Wiramanaden, Cheryl I. E, Pickering, Ingrid J, Belzile, Nelson, Chen, Y.-W, London, Jacqueline, Wallschläger, Dirk
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Sprache:	eng
Schlagworte:	Applied sciences Biogeochemistry Carbon - analysis Characterization of Natural and Affected Environments Ecological and Environmental Phenomena Environment Exact sciences and technology Fresh Water - chemistry Geologic Sediments - chemistry Hydrogen-Ion Concentration Nitrogen - analysis Oxidation-Reduction Pollution Recycling Sediments Selenium Selenium - analysis Selenium - chemistry Selenium - metabolism Spectrum analysis Vegetation Water Pollutants, Chemical - analysis Water Pollutants, Chemical - chemistry Water Pollutants, Chemical - metabolism
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creator	Martin, Alan J Simpson, Stephanie Fawcett, Skya Wiramanaden, Cheryl I. E Pickering, Ingrid J Belzile, Nelson Chen, Y.-W London, Jacqueline Wallschläger, Dirk
description	The biogeochemical mechanisms of Se exchange between water and sediments in two contrasting lentic environments were assessed through examination of Se speciation in the water column, porewater, and sediment. High-resolution (7 mm) vertical profiles of
doi_str_mv	10.1021/es103604p
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At both sites Se(VI) is removed from solution in suboxic near-surface porewaters demonstrating that the sediments are serving as diffusive sinks for Se. X-ray absorption near edge spectroscopy (XANES) of sediments suggests that elemental Se and organo-Se represent the dominant sedimentary sinks for dissolved Se. Dissolved Se(IV) and organo-Se are released to porewaters in the near-surface sediments resulting in the diffusive transport of these species into the water column, where between-site differences in the depths of release can be linked to differences in redox zonation. The presence or absence of emergent vegetation is proposed to present a dominant control on sedimentary redox conditions as well as on the recycling and persistence of reduced Se species in bottom waters.</description><identifier>ISSN: 0013-936X</identifier><identifier>EISSN: 1520-5851</identifier><identifier>DOI: 10.1021/es103604p</identifier><identifier>PMID: 21446766</identifier><identifier>CODEN: ESTHAG</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Applied sciences ; Biogeochemistry ; Carbon - analysis ; Characterization of Natural and Affected Environments ; Ecological and Environmental Phenomena ; Environment ; Exact sciences and technology ; Fresh Water - chemistry ; Geologic Sediments - chemistry ; Hydrogen-Ion Concentration ; Nitrogen - analysis ; Oxidation-Reduction ; Pollution ; Recycling ; Sediments ; Selenium ; Selenium - analysis ; Selenium - chemistry ; Selenium - metabolism ; Spectrum analysis ; Vegetation ; Water Pollutants, Chemical - analysis ; Water Pollutants, Chemical - chemistry ; Water Pollutants, Chemical - metabolism</subject><ispartof>Environmental science & technology, 2011-04, Vol.45 (7), p.2605-2612</ispartof><rights>Copyright © 2011 American Chemical Society</rights><rights>2015 INIST-CNRS</rights><rights>Copyright American Chemical Society Apr 1, 2011</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a437t-2c23ccadcfc96454b5f05dd31c4a2d6fd32cbef9d500eff5c5e4305a478155d3</citedby><cites>FETCH-LOGICAL-a437t-2c23ccadcfc96454b5f05dd31c4a2d6fd32cbef9d500eff5c5e4305a478155d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/es103604p$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/es103604p$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,776,780,2752,27053,27901,27902,56713,56763</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=24024992$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/21446766$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Martin, Alan J</creatorcontrib><creatorcontrib>Simpson, Stephanie</creatorcontrib><creatorcontrib>Fawcett, Skya</creatorcontrib><creatorcontrib>Wiramanaden, Cheryl I. 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High-resolution (7 mm) vertical profiles of <0.45 μm Se species across the sediment-water interface demonstrate that the behavior of dissolved Se(VI), Se(IV), and organo-Se are closely linked to redox conditions as revealed by porewater profiles of redox-sensitive species (dissolved O2, NO3 −, Fe, Mn, SO4 2-, and ΣH2S). At both sites Se(VI) is removed from solution in suboxic near-surface porewaters demonstrating that the sediments are serving as diffusive sinks for Se. X-ray absorption near edge spectroscopy (XANES) of sediments suggests that elemental Se and organo-Se represent the dominant sedimentary sinks for dissolved Se. Dissolved Se(IV) and organo-Se are released to porewaters in the near-surface sediments resulting in the diffusive transport of these species into the water column, where between-site differences in the depths of release can be linked to differences in redox zonation. The presence or absence of emergent vegetation is proposed to present a dominant control on sedimentary redox conditions as well as on the recycling and persistence of reduced Se species in bottom waters.</description><subject>Applied sciences</subject><subject>Biogeochemistry</subject><subject>Carbon - analysis</subject><subject>Characterization of Natural and Affected Environments</subject><subject>Ecological and Environmental Phenomena</subject><subject>Environment</subject><subject>Exact sciences and technology</subject><subject>Fresh Water - chemistry</subject><subject>Geologic Sediments - chemistry</subject><subject>Hydrogen-Ion Concentration</subject><subject>Nitrogen - analysis</subject><subject>Oxidation-Reduction</subject><subject>Pollution</subject><subject>Recycling</subject><subject>Sediments</subject><subject>Selenium</subject><subject>Selenium - analysis</subject><subject>Selenium - chemistry</subject><subject>Selenium - metabolism</subject><subject>Spectrum analysis</subject><subject>Vegetation</subject><subject>Water Pollutants, Chemical - analysis</subject><subject>Water Pollutants, Chemical - chemistry</subject><subject>Water Pollutants, Chemical - metabolism</subject><issn>0013-936X</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpl0V9rFDEQAPAgFntWH_wCEgQRH1Ynf-_2UY_TFk588EDfllwyuabsJtdk1-q3N7XXHujTwMyPmWGGkBcM3jHg7D0WBkKD3D8iM6Y4NGqh2GMyA2CiaYX-cUqelnIFAFzA4gk55UxKPdd6Rq4_hrTDZC9xCNb09AvaSxNDGQpNnn7DHmOYBrr6dZveId3ieIMY6XczYqYmumpcGDCOhYZINzeJLlMcsyljiDu6roVg6Sr-DDnFv-wZOfGmL_j8EM_I5tNqszxv1l8_Xyw_rBsjxXxsuOXCWuOst62WSm6VB-WcYFYa7rR3gtst-tYpAPReWYVSgDJyvmBKOXFG3ty13ed0PWEZuyEUi31vIqapdAutueKCySpf_SOv0pRj3a0iyaVQQlT09g7ZnErJ6Lt9DoPJvzsG3e0TuocnVPvy0HDaDuge5P3VK3h9AKbUo_tsog3l6CRw2bb86Iwtx6X-H_gHevucHg</recordid><startdate>20110401</startdate><enddate>20110401</enddate><creator>Martin, Alan J</creator><creator>Simpson, Stephanie</creator><creator>Fawcett, Skya</creator><creator>Wiramanaden, Cheryl I. 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E</au><au>Pickering, Ingrid J</au><au>Belzile, Nelson</au><au>Chen, Y.-W</au><au>London, Jacqueline</au><au>Wallschläger, Dirk</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Biogeochemical Mechanisms of Selenium Exchange between Water and Sediments in Two Contrasting Lentic Environments</atitle><jtitle>Environmental science & technology</jtitle><addtitle>Environ. Sci. Technol</addtitle><date>2011-04-01</date><risdate>2011</risdate><volume>45</volume><issue>7</issue><spage>2605</spage><epage>2612</epage><pages>2605-2612</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>The biogeochemical mechanisms of Se exchange between water and sediments in two contrasting lentic environments were assessed through examination of Se speciation in the water column, porewater, and sediment. High-resolution (7 mm) vertical profiles of <0.45 μm Se species across the sediment-water interface demonstrate that the behavior of dissolved Se(VI), Se(IV), and organo-Se are closely linked to redox conditions as revealed by porewater profiles of redox-sensitive species (dissolved O2, NO3 −, Fe, Mn, SO4 2-, and ΣH2S). At both sites Se(VI) is removed from solution in suboxic near-surface porewaters demonstrating that the sediments are serving as diffusive sinks for Se. X-ray absorption near edge spectroscopy (XANES) of sediments suggests that elemental Se and organo-Se represent the dominant sedimentary sinks for dissolved Se. Dissolved Se(IV) and organo-Se are released to porewaters in the near-surface sediments resulting in the diffusive transport of these species into the water column, where between-site differences in the depths of release can be linked to differences in redox zonation. The presence or absence of emergent vegetation is proposed to present a dominant control on sedimentary redox conditions as well as on the recycling and persistence of reduced Se species in bottom waters.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>21446766</pmid><doi>10.1021/es103604p</doi><tpages>8</tpages></addata></record>
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subjects	Applied sciences Biogeochemistry Carbon - analysis Characterization of Natural and Affected Environments Ecological and Environmental Phenomena Environment Exact sciences and technology Fresh Water - chemistry Geologic Sediments - chemistry Hydrogen-Ion Concentration Nitrogen - analysis Oxidation-Reduction Pollution Recycling Sediments Selenium Selenium - analysis Selenium - chemistry Selenium - metabolism Spectrum analysis Vegetation Water Pollutants, Chemical - analysis Water Pollutants, Chemical - chemistry Water Pollutants, Chemical - metabolism
title	Biogeochemical Mechanisms of Selenium Exchange between Water and Sediments in Two Contrasting Lentic Environments
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