Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic
[Image: see text] 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...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10734258/ http://www.ncbi.nlm.nih.gov/pubmed/38051294 https://doi.org/10.1021/acs.est.3c01810 |
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ftpubmed:oai:pubmedcentral.nih.gov:10734258 2024-01-21T10:08:27+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 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10734258/ http://www.ncbi.nlm.nih.gov/pubmed/38051294 https://doi.org/10.1021/acs.est.3c01810 en eng American Chemical Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10734258/ http://www.ncbi.nlm.nih.gov/pubmed/38051294 http://dx.doi.org/10.1021/acs.est.3c01810 © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). Environ Sci Technol Text 2023 ftpubmed https://doi.org/10.1021/acs.est.3c01810 2023-12-24T02:11:08Z [Image: see text] 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 K̅(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 K̅(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 K̅(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. Text North Atlantic PubMed Central (PMC) Environmental Science & Technology 57 50 21136 21144 |
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description |
[Image: see text] 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 K̅(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 K̅(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 K̅(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. |
format |
Text |
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 |
American Chemical Society |
publishDate |
2023 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10734258/ http://www.ncbi.nlm.nih.gov/pubmed/38051294 https://doi.org/10.1021/acs.est.3c01810 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Environ Sci Technol |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10734258/ http://www.ncbi.nlm.nih.gov/pubmed/38051294 http://dx.doi.org/10.1021/acs.est.3c01810 |
op_rights |
© 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). |
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 |
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1788699159077847040 |