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 K̅H) and heterogen...
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ACS (American Chemical Society)
2023
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Online Access: | https://oceanrep.geomar.de/id/eprint/59631/ https://oceanrep.geomar.de/id/eprint/59631/7/lodeiro-et-al-2023-proton-binding-characteristics-of-dissolved-organic-matter-extracted-from-the-north-atlantic.pdf https://pubs.acs.org/doi/10.1021/acs.est.3c01810 https://doi.org/10.1021/acs.est.3c01810 |
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ftoceanrep:oai:oceanrep.geomar.de:59631 2024-02-11T10:06:14+01:00 Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic Lodeiro, Pablo Rey-Castro, Carlos David, Calin Humphreys, Matthew P. Gledhill, Martha 2023-12-05 text https://oceanrep.geomar.de/id/eprint/59631/ https://oceanrep.geomar.de/id/eprint/59631/7/lodeiro-et-al-2023-proton-binding-characteristics-of-dissolved-organic-matter-extracted-from-the-north-atlantic.pdf https://pubs.acs.org/doi/10.1021/acs.est.3c01810 https://doi.org/10.1021/acs.est.3c01810 en eng ACS (American Chemical Society) https://oceanrep.geomar.de/id/eprint/59631/7/lodeiro-et-al-2023-proton-binding-characteristics-of-dissolved-organic-matter-extracted-from-the-north-atlantic.pdf Lodeiro, P., Rey-Castro, C., David, C., Humphreys, M. P. and Gledhill, M. (2023) Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic. Open Access Environmental Science & Technology, 57 (50). pp. 21136-21144. DOI 10.1021/acs.est.3c01810 <https://doi.org/10.1021/acs.est.3c01810>. doi:10.1021/acs.est.3c01810 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2023 ftoceanrep https://doi.org/10.1021/acs.est.3c01810 2024-01-15T00:28:03Z 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 K̅H) 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 K̅H 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 (m1= 0.666 ± 0.009) ca. 10% higher than those observed in surface open ocean or coastal samples. On the contrary, the log K̅H 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 m2 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. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Environmental Science & Technology 57 50 21136 21144 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
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 K̅H) 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 K̅H 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 (m1= 0.666 ± 0.009) ca. 10% higher than those observed in surface open ocean or coastal samples. On the contrary, the log K̅H 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 m2 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. |
format |
Article in Journal/Newspaper |
author |
Lodeiro, Pablo Rey-Castro, Carlos David, Calin Humphreys, Matthew P. Gledhill, Martha |
spellingShingle |
Lodeiro, Pablo Rey-Castro, Carlos David, Calin Humphreys, Matthew P. Gledhill, Martha Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic |
author_facet |
Lodeiro, Pablo Rey-Castro, Carlos David, Calin Humphreys, Matthew P. Gledhill, Martha |
author_sort |
Lodeiro, Pablo |
title |
Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic |
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 |
publisher |
ACS (American Chemical Society) |
publishDate |
2023 |
url |
https://oceanrep.geomar.de/id/eprint/59631/ https://oceanrep.geomar.de/id/eprint/59631/7/lodeiro-et-al-2023-proton-binding-characteristics-of-dissolved-organic-matter-extracted-from-the-north-atlantic.pdf https://pubs.acs.org/doi/10.1021/acs.est.3c01810 https://doi.org/10.1021/acs.est.3c01810 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/59631/7/lodeiro-et-al-2023-proton-binding-characteristics-of-dissolved-organic-matter-extracted-from-the-north-atlantic.pdf Lodeiro, P., Rey-Castro, C., David, C., Humphreys, M. P. and Gledhill, M. (2023) Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic. Open Access Environmental Science & Technology, 57 (50). pp. 21136-21144. DOI 10.1021/acs.est.3c01810 <https://doi.org/10.1021/acs.est.3c01810>. doi:10.1021/acs.est.3c01810 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1021/acs.est.3c01810 |
container_title |
Environmental Science & Technology |
container_volume |
57 |
container_issue |
50 |
container_start_page |
21136 |
op_container_end_page |
21144 |
_version_ |
1790603813249351680 |