Seasonal variations in proton binding characteristics of dissolved organic matter isolated from the southwest baltic sea

Ver/ Abrir
Fecha de publicación
2021Autor/a
Achterberg, Eric P.
Gledhill, Martha
Cita recomendada
Lodeiro, Pablo;
Rey Castro, Carlos;
David, Calin;
Puy Llorens, Jaume;
Achterberg, Eric P.;
Gledhill, Martha;
.
(2021)
.
Seasonal variations in proton binding characteristics of dissolved organic matter isolated from the southwest baltic sea.
Environmental Science & Technology, 2021, vol. 55, núm. 23, p. 16215-16223.
https://doi.org/10.1021/acs.est.1c04773.
Metadatos
Mostrar el registro completo del ítemResumen
The 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.
Es parte de
Environmental Science & Technology, 2021, vol. 55, núm. 23, p. 16215-16223Proyectos de investigación europeos
Colecciones
El ítem tiene asociados los siguientes ficheros de licencia: