Voltammetric Study of Organic Matter Components in the Upper Reach of the Krka River, Croatia

Strmečki, Slađana; Ciglenečki, Irena; Udovič, Marija Gligora; Marguš, Marija; Bura-Nakić, Elvira; Dautović, Jelena; Plavšić, Marta

doi:10.5562/cca3443

Cited by 5 publications

(4 citation statements)

References 19 publications

(28 reference statements)

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“…whereas production during the spring and summer increases the contribution of autochthonous DOM (Strmečki et al, 2018). Our data support that in-situ production mainly releases protein-like substances, as already observed by (Osburn et al, 2012), making their contribution to the total fluorescence increasing from 11.4% in February to 30.1% in July.…”

Section: Dom In the River End-membersupporting

confidence: 88%

“…Extreme case is the Arno River with more than 10-times higher DOC concentrations (320-365 µM) (Retelletti than the Krka River. The values reported in our study are lower than those measured by (Strmečki et al, 2018) in the upper reach of the Krka River (Brljan Lake) in March, May, June, September and November of 2011 and in January 2012 (45-127 µM). Despite the wide range of DOC concentrations, 80% of reported values was lower than 60 µM during their study, whereas values >100 µM were measured only in March and May 2011.…”

Section: Dom In the River End-membercontrasting

confidence: 77%

“…The change in DOM pool is supported by 48.4% and 39.6% reduction in humic-like components (C1 and C2, respectively) and 42.9% increase in protein-like component (C3) in July with respect to February. Due to absence of anthropogenic sources through the whole year (Cukrov et al, 2008) and the low biological activity during the winter (Strmečki et al, 2018), RW contains ˝authentic˝ terrestrial DOM,…”

Section: Dom In the River End-membermentioning

confidence: 99%

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Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

et al. 2020

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In many estuarine systems, riverine discharge is the main source of dissolved organic matter (DOM). In contrast, karstic Krka River, with self-purifying ability, is characterized by very low DOM concentrations (~30 µM) and a diluting effect on DOM in the estuary. Interestingly, within the estuary a marked in-situ production is observed, particularly in summer. Pristine nature of the estuary makes it a natural laboratory to study the DOM dynamics, originated from 3 sources: the river the seawater and in-situ production. With this work we aim at reporting the first information on DOM dynamics in the Krka estuary in two contrasting seasons, winter and summer 2019. The quality of DOM was assessed using absorbance and fluorescence measurements coupled with PARAFAC analysis. During winter, the estuary is characterized by extremely low DOC concentrations, for which optical properties indicate that is mainly of terrestrial origin. In summer, due to the low riverine discharge and high temperature, DOC concentrations are higher than in winter and a marked increase in absorption and protein-like fluorescence is observed in the estuary. The permanent stratification determines DOC accumulation in the surface layer with values up to 147 µM, suggesting a decoupling between production and removal processes. Our work opens intriguing questions about the main processes responsible for DOC accumulation in this system and highlights the need of new studies combing chemical and biological information.

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Section: Dom In the River End-membersupporting

confidence: 88%

Section: Dom In the River End-membercontrasting

confidence: 77%

Section: Dom In the River End-membermentioning

confidence: 99%

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Dissolved organic matter dynamics in the pristine Krka River estuary (Croatia)

et al. 2020

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“…34.8 ± 2.8 nM GSH) on April 1st, while their concentration was lower in the corresponding ULW samples, indicating possible atmospheric impact via deposition of various aerosols such as pollen and/or BB in the SML. Moreover, RSS were detected in all SML and ULW samples at Martinska station situated in the Šibenik Bay (in Krka River estuary; Tables 2 and 3), but at higher levels than previously reported for the water column in the upper reach of the Krka River, 56 possibly due to atmospheric impact.…”

Section: Resultsmentioning

confidence: 50%