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dc.contributor.authorLodeiro, Pablo
dc.contributor.authorRey Castro, Carlos
dc.contributor.authorDavid, Calin
dc.contributor.authorPuy Llorens, Jaume
dc.contributor.authorAchterberg, Eric P.
dc.contributor.authorGledhill, Martha
dc.description.abstractThe physicochemical characteristics of dissolved organic matter (DOM) strongly influence its interactions with inorganic species such as protons and trace elements in natural waters. We collected water samples at Boknis Eck, a time series station in the Baltic Sea with a low exposure to freshwater inputs, to investigate how seasonal fluctuations impact the proton binding properties of the isolated DOM. We used potentiometric titrations to assess the binding properties of solid-phase extracted DOM (SPE–DOM) over a seasonal cycle. We report and critically analyze the first NICA parameters estimates of carboxylic-like and phenolic-like sites for brackish water SPE–DOM. The total amount of functional groups (QmaxH,tot) showed no seasonal fluctuations and an average value of 136 ± 5.2 mmol·mol C–1. The average proton affinity (logKH) and binding site heterogeneity (m) showed a relatively minor variability for samples obtained between April and September, when the water remained stratified. These results contribute to a better understanding of the ion binding characteristics of DOM in natural brackish waters.ca_ES
dc.description.sponsorshipThe authors gratefully acknowledge support from the Deutsche Forschungsgemeinschaft (Project GL 807/2), the German Helmholtz Association, and Grants PID2019-107033GB-C21 and PID2020-117910GB-C21 funded by MCIN/AEI/10.13039/501100011033. P.L. also acknowledges current support from the Ministerio de Ciencia, Innovación y Universidades of Spain and University of Lleida (Beatriz Galindo Senior award number BG20/00104).ca_ES
dc.publisherACS publicationsca_ES
dc.relation.isformatofReproducció del document publicat a
dc.relation.ispartofEnvironmental Science & Technology, 2021, vol. 55, núm. 23, p. 16215-16223ca_ES
dc.rightscc-by (c) Lodeiro, et al., 2021ca_ES
dc.subjectSolid-phase extractionca_ES
dc.subjectProton bindingca_ES
dc.subjectLog KHca_ES
dc.subjectSolid-phase extractionca_ES
dc.subjectNonideal competitive adsorption (NICA)ca_ES
dc.titleSeasonal variations in proton binding characteristics of dissolved organic matter isolated from the southwest baltic seaca_ES

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