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Comprehensive asses...
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
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- Li, Siyu (författare)
- Helmholtz Munich, Germany
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- Harir, Mourad (författare)
- Helmholtz Munich, Germany; Tech Univ Muenchen, Germany
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- Schmitt-Kopplin, Philippe (författare)
- Helmholtz Munich, Germany; Tech Univ Muenchen, Germany
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- Gonsior, Michael (författare)
- Univ Maryland, MD 20688 USA
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- Enrich Prast, Alex (författare)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten,Fed Univ Sao Paolo, Brazil
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- Bastviken, David (författare)
- Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
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- Valle, Juliana (författare)
- Helmholtz Munich, Germany
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- Machado-Silva, Fausto (författare)
- Fluminense Fed Univ, Brazil; Univ Toledo, OH 43606 USA
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- Hertkorn, Norbert (författare)
- Helmholtz Munich, Germany
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(creator_code:org_t)
- ELSEVIER, 2023
- 2023
- Engelska.
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Ingår i: Science of the Total Environment. - : ELSEVIER. - 0048-9697 .- 1879-1026. ; 857
- Relaterad länk:
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https://liu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 electro-spray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI[+/-] FT-ICR MS) and nuclear mag-netic 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) Solimoes 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 Tapajos River. The Negro River (black water) supplies more highly oxygenated and high molecular weight compounds, whereas the Solimoes 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- Mixing zone; Tributaries; Environmental drivers; FT-ICR MS; NMR
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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