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Li, S. ; Harir, M. ; Schmitt-Kopplin, P. ; Gonsior, M.* ; Alex-Enrich-Prast, .* ; Bastviken, D.* ; Valle Das Neves, J. ; Machado-Silva, F.* ; Hertkorn, N.

Comprehensive assessment of dissolved organic matter processing in the Amazon River and its major tributaries revealed by positive and negative electrospray mass spectrometry and NMR spectroscopy.

Sci. Total Environ. 857:159620 (2022)
Postprint DOI PMC
Rivers are natural biogeochemical systems shaping the fates of dissolved organic matter (DOM) from leaving soils to reaching the oceans. This study focuses on Amazon basin DOM processing employing negative and positive electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI[±] FT-ICR MS) and nuclear magnetic resonance spectroscopy (NMR) to reveal effects of major processes on the compositional space and structural characteristics of black, white and clear water systems. These include non-conservative mixing at the confluences of (1) Solimões and the Negro River, (2) the Amazon River and the Madeira River, and (3) in-stream processing of Amazon River DOM between the Madeira River and the Tapajós River. The Negro River (black water) supplies more highly oxygenated and high molecular weight compounds, whereas the Solimões and Madeira Rivers (white water) contribute more CHNO and CHOS molecules to the Amazon River main stem. Aliphatic CHO and abundant CHNO compounds prevail in Tapajos River DOM (clear water), likely originating from primary production. Sorption onto particles and heterotrophic microbial degradation are probably the principal mechanisms for the observed changes in DOM composition in the Amazon River and its tributaries.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter Environmental Drivers ; Ft-icr Ms ; Mixing Zone ; Nmr ; Tributaries; Solid-phase Extraction; Molecular Characterization; Bacterial Production; Optical-properties; Humic Substances; Carbon; Oxygen; Acids; Dom; Biogeochemistry
ISSN (print) / ISBN 0048-9697
e-ISSN 1879-1026
Zeitschrift Science of the Total Environment, The
Quellenangaben Band: 857, Heft: 3, Seiten: , Artikelnummer: 159620 Supplement: ,
Verlag Elsevier
Verlagsort Radarweg 29, 1043 Nx Amsterdam, Netherlands
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Research Unit BioGeoChemistry and Analytics (BGC)
Förderungen Formas
Swedish Research Council
Vinnova
Brazilian Foundation CNPq
Brazilian Foundation FAPERJ
Brazilian Foundation CAPES
China Scholarship Council
European Research Council ERC
Swedish Research Council (VR)
Swedish Research Council for Sustainable Development, FORMAS
Alexander von Humboldt Foundation