Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
| one publication added to basket [381441] |
Proton binding characteristics of dissolved organic matter extracted from the North Atlantic
Lodeiro, P.; Rey-Castro, C.; David, C.; Humphreys, M.P.; Gledhill, M. (2023). Proton binding characteristics of dissolved organic matter extracted from the North Atlantic. Environ. Sci. Technol. 57(50): 21136-21144. https://dx.doi.org/10.1021/acs.est.3c01810
In: Environmental Science and Technology. American Chemical Society: Easton. ISSN 0013-936X; e-ISSN 1520-5851, meer
|   |
| Author keywords |
DOM; nonideal competitive adsorption (NICA); Donnan; proton binding; acid-base; log K¯ H; solid-phase extraction; seawater; heterogeneity |
| Auteurs | | Top |
- Lodeiro, P.
- Rey-Castro, C.
- David, C.
|
- Humphreys, M.P., meer
- Gledhill, M.
|
|
| Abstract |
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 (m1= 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 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. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
