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Croatica Chemica Acta, Vol. 91 No. 4, 2018.

Original scientific paper

https://doi.org/10.5562/cca3443

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

Slađana Strmečki ; Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička c. 54, HR-10000 Zagreb, Croatia
Irena Ciglenečki ; Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička c. 54, HR-10000 Zagreb, Croatia
Marija Gligora Udovič ; University of Zagreb, Faculty of Science, Department of Biology, Rooseveltov trg 6, HR-10000 Zagreb, Croatia
Marija Marguš ; Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička c. 54, HR-10000 Zagreb, Croatia
Elvira Bura-Nakić ; Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička c. 54, HR-10000 Zagreb, Croatia
Jelena Dautović ; Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička c. 54, HR-10000 Zagreb, Croatia
Marta Plavšić ; Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička c. 54, HR-10000 Zagreb, Croatia

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Abstract

The increased amount of organic matter (OM) accompanied with the development of hypoxia/anoxia and appearance of the sulphur species are indicators of eutrophication in natural waters. To predict biogeochemical and ecological changes, specific OM components in the Lake Brljan (the karst Krka River, Croatia; station B and station B2 downstream) were studied during 2011 and in January 2012 using voltam¬metry. Surface‒active substances (eq. 0.018 to 0.150 mg dm–3 Triton‒X‒100) and Cu complexing capacity (54‒680 nmol dm–3) showed the highest values in surface water layer in May 2011 (B) and in November 2011 (B2), associated with the highest dissolved (0.505‒1.530 mg C dm–3) and particulate (0.051‒0.725 mg C dm–3) organic carbon and phytoplankton biomass. Autochthonously produced OM did not cause hypoxia/anoxia during the investigated period. Brljan's lake water could be characterised as oligotrophic with occasionally elevated OM concentration depending on season and Krka River water regime.

This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

Lake Brljan; Krka River; organic matter; voltammetry; phytoplankton production; oligotrophy

Hrčak ID:

216741

URI

https://hrcak.srce.hr/216741

Publication date:

30.12.2018.

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