Proton binding characteristics of dissolved organic matter extracted from the north atlantic

Marine dissolved organic matter (DOM) presents key thermodynamic properties that are not yet fully constrained. Here, we report the distribution of binding sites occupied by protons (i.e., proton affinity spectra) and parametrize the median intrinsic proton binding affinities (log K-H) and heterogen...

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Autores: Lodeiro, Pablo, Rey-Castro, Carlos, David, Calin, Humphreys, Matthew P., Gledhill, Martha
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:10459.1/465073
Acceso en línea:https://doi.org/10.1021/acs.est.3c01810
https://hdl.handle.net/10459.1/465073
Access Level:acceso abierto
Palabra clave:DOM
Nonideal competitive adsorption (NICA)
Donnan
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spelling Proton binding characteristics of dissolved organic matter extracted from the north atlanticLodeiro, PabloRey-Castro, CarlosDavid, CalinHumphreys, Matthew P.Gledhill, MarthaDOMNonideal competitive adsorption (NICA)DonnanMarine dissolved organic matter (DOM) presents key thermodynamic properties that are not yet fully constrained. Here, we report the distribution of binding sites occupied by protons (i.e., proton affinity spectra) and parametrize the median intrinsic proton binding affinities (log K-H) and heterogeneities (m), for DOM samples extracted from the North Atlantic. We estimate that 11.4 +/- 0.6% of C atoms in the extracted marine DOM have a functional group with a binding site for ionic species. The log K-H of the most acidic groups was larger (4.01-4.02 +/- 0.02) than that observed in DOM from coastal waters (3.82 +/- 0.02), while the chemical binding heterogeneity parameter increased with depth to values (m(1)= 0.666 +/- 0.009) ca. 10% higher than those observed in surface open ocean or coastal samples. On the contrary, the log K-H for the less acidic groups shows a difference between the surface (10.01 +/- 0.08) and deep (9.22 +/- 0.35) samples. The latter chemical groups were more heterogeneous for marine than for terrestrial DOM, and m(2) decreased with depth to values of 0.28 +/- 0.03. Binding heterogeneity reflects aromatic carbon compounds' persistence and accumulation in diverse, low-abundance chemical forms, while easily degradable low-affinity groups accumulate more uniformly in the deep ocean.We thank the captain and crew of R/V Meteor, chief scientists A. Koschinsky and M. Frank, and A. Mutzberg for the nutrient analysis. The authors gratefully acknowledge support from the Deutsche Forschungsgemeinschaft (Project GL 807/2) and for funding R/V Meteor cruise M147, the German Helmholtz Association, and Grants PID2019-107033GB-C21, PID2020-117910GB-C21, and PID2022-140312NB-C21funded by MCIN/AEI/10.13039/501100011033 and FEDER funds. P.L. also acknowledges current support from the Ministerio de Ciencia, Innovacion y Universidades of Spain and University of Lleida (Beatriz Galindo Senior award number BG20/00104).American Chemical Society2024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttps://doi.org/10.1021/acs.est.3c01810https://hdl.handle.net/10459.1/465073reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a https://doi.org/10.1021/acs.est.3c01810Environmental Science & Technology, 2023, vol. 57, núm. 50, p. 21136-21144cc by (c) Lodeiro et al., 2023Attribution-NonCommercial-NoDerivatives 4.0 Internationalinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/oai:recercat.cat:10459.1/4650732026-05-29T05:05:01Z
dc.title.none.fl_str_mv Proton binding characteristics of dissolved organic matter extracted from the north atlantic
title Proton binding characteristics of dissolved organic matter extracted from the north atlantic
spellingShingle Proton binding characteristics of dissolved organic matter extracted from the north atlantic
Lodeiro, Pablo
DOM
Nonideal competitive adsorption (NICA)
Donnan
title_short Proton binding characteristics of dissolved organic matter extracted from the north atlantic
title_full Proton binding characteristics of dissolved organic matter extracted from the north atlantic
title_fullStr Proton binding characteristics of dissolved organic matter extracted from the north atlantic
title_full_unstemmed Proton binding characteristics of dissolved organic matter extracted from the north atlantic
title_sort Proton binding characteristics of dissolved organic matter extracted from the north atlantic
dc.creator.none.fl_str_mv Lodeiro, Pablo
Rey-Castro, Carlos
David, Calin
Humphreys, Matthew P.
Gledhill, Martha
author Lodeiro, Pablo
author_facet Lodeiro, Pablo
Rey-Castro, Carlos
David, Calin
Humphreys, Matthew P.
Gledhill, Martha
author_role author
author2 Rey-Castro, Carlos
David, Calin
Humphreys, Matthew P.
Gledhill, Martha
author2_role author
author
author
author
dc.subject.none.fl_str_mv DOM
Nonideal competitive adsorption (NICA)
Donnan
topic DOM
Nonideal competitive adsorption (NICA)
Donnan
description Marine dissolved organic matter (DOM) presents key thermodynamic properties that are not yet fully constrained. Here, we report the distribution of binding sites occupied by protons (i.e., proton affinity spectra) and parametrize the median intrinsic proton binding affinities (log K-H) and heterogeneities (m), for DOM samples extracted from the North Atlantic. We estimate that 11.4 +/- 0.6% of C atoms in the extracted marine DOM have a functional group with a binding site for ionic species. The log K-H of the most acidic groups was larger (4.01-4.02 +/- 0.02) than that observed in DOM from coastal waters (3.82 +/- 0.02), while the chemical binding heterogeneity parameter increased with depth to values (m(1)= 0.666 +/- 0.009) ca. 10% higher than those observed in surface open ocean or coastal samples. On the contrary, the log K-H for the less acidic groups shows a difference between the surface (10.01 +/- 0.08) and deep (9.22 +/- 0.35) samples. The latter chemical groups were more heterogeneous for marine than for terrestrial DOM, and m(2) decreased with depth to values of 0.28 +/- 0.03. Binding heterogeneity reflects aromatic carbon compounds' persistence and accumulation in diverse, low-abundance chemical forms, while easily degradable low-affinity groups accumulate more uniformly in the deep ocean.
publishDate 2024
dc.date.none.fl_str_mv 2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1021/acs.est.3c01810
https://hdl.handle.net/10459.1/465073
url https://doi.org/10.1021/acs.est.3c01810
https://hdl.handle.net/10459.1/465073
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a https://doi.org/10.1021/acs.est.3c01810
Environmental Science & Technology, 2023, vol. 57, núm. 50, p. 21136-21144
dc.rights.none.fl_str_mv cc by (c) Lodeiro et al., 2023
Attribution-NonCommercial-NoDerivatives 4.0 International
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
rights_invalid_str_mv cc by (c) Lodeiro et al., 2023
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
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