Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic.

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

SUBMITTER: Lodeiro P 

PROVIDER: S-EPMC10734258 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature