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Molecular differences between water column and sediment porewater SPE-DOM in ten Swedish boreal lakes
German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Neuherberg, Germany.
German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Neuherberg, Germany; Technische Universit€at München, Chair Analytical Food Chemistry, Freising, Weihenstephan, Germany.
University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, USA.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Federal University of Rio de Janeiro, Department of Botany, Rio de Janeiro, Brazil.
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2020 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 170, article id 115320Article in journal (Refereed) Published
Abstract [en]

Boreal lakes are considered hot spots of dissolved organic matter (DOM) processing within the globalcarbon cycle. This study has used FT-ICR mass spectrometry and comprehensive data evaluation to assessthe molecular differences of SPE-DOM between lake column water SPE-DOM and sedimentary porewater SPE-DOM in 10 Swedish boreal lakes of the Malingsbo area, which were selected for their largediversity of physicochemical and morphological characteristics. While lake column water is well mixedand fairly oxygenated, sedimentary pore water is subject to depletion of oxygen and to confinement ofmolecules. Robust trends were deduced from molecular compositions present in all compartments andin all 10 lakes (“common compositions”) with recognition of relative abundance. Sedimentary pore waterSPE-DOM featured higher proportions of heteroatoms N and S, higher average H/C ratios in presence ofhigher DBE/C ratios, and higher average oxygenation than lake column water SPE-DOM. These trendswere observed in all lakes except Ljustj€arn, which is a ground water fed kettle lake with an unique lakebiogeochemistry. Analogous trends were also observed in case of single or a few lakes and operated alsofor compounds present solely in either lake column water or sedimentary pore water. Unique compoundsdetected in either compartments and/or in a few lakes showed higher molecular diversity thanthe “common compositions”. Processing of DOM molecules in sediments included selective preservationfor polyphenolic compounds and microbial resynthesis of selected molecules of considerable diversity.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 170, article id 115320
Keywords [en]
Solid phase extraction; DOM; FTICR-MS; Lake; Sediment; Microbial oxidation
National Category
Geochemistry Oceanography, Hydrology and Water Resources Environmental Sciences
Identifiers
URN: urn:nbn:se:liu:diva-162681DOI: 10.1016/j.watres.2019.115320ISI: 000509611300078PubMedID: 31837638Scopus ID: 2-s2.0-85076316717OAI: oai:DiVA.org:liu-162681DiVA, id: diva2:1379163
Note

Supplementary data to this article can be found online at https://doi.org/10.1016/j.watres.2019.115320

Funding agencies: Swedish Research Councils VRSwedish Research Council [2012-00048]; STINT [2012-2085]; European Research Council (ERC)European Research Council (ERC) [725546]; Brazilian National Council of Technological and Scientific Development (CNPq)National Council fo

Available from: 2019-12-16 Created: 2019-12-16 Last updated: 2020-03-02Bibliographically approved

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Enrich Prast, AlexBastviken, David

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