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Assessing trace metal contamination and organic matter in the brackish lakes as the major source of potable water

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Abstract

On small and medium karstic coastal islands in the Adriatic Sea, brackish lakes are often the only source of freshwater. Therefore, it is important to adequately evaluate the biogeochemical processes occurring in these complex water systems, as well as to determine the origin of contaminants present. In this study, the distribution and origin of trace metals (Tl, Hg, Cd, Pb, Cu, Zn, Ni, Co) and organic matter in the water column, sediment, and surrounding soil of the brackish lakes on Mljet Island, South Adriatic Sea, Croatia, were evaluated. Thallium and mercury concentrations in the lake water were up to two orders of magnitude higher compared to ranges found in the adjacent coastal sea water. Elevated thallium concentrations were of anthropogenic origin resulting from previous use of rodenticide, while elevated mercury content was naturally enhanced. Levels for the other metals were characteristic of uncontaminated water systems. Speciation modelling showed that dissolved trace metals such as Cu, Pb, and Zn were mostly associated with organic matter, while Tl, Co, and Ni were present predominantly as free ions and inorganic complexes. The presence of organic matter (OM) clearly influenced the speciation and distribution of some trace metals. OM was characterised by the determination of the complexing capacity for Cu ions (CuCC), surface active substances, and catalytically active compounds. Reduced sulphur species (glutathione and other thiols) representing significant Cu-binding ligands were determined and discussed as well.

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Acknowledgements

We acknowledge the financial and professional support of the Mljet National Park and the financial support of the Croatian Academy of Science and Arts for the project “The study of biogeochemical processes in brackish lakes on the island of Mljet as a potential source of drinking water and water for irrigation”. Our special thanks go to Dr. Željka Fiket (from our Division) for the statistical analysis and to Professor Renée E. Bishop-Pierce (Penn State University, Worthington Scranton, USA) for editing grammar and syntax.

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Authors and Affiliations

  1. Division for Marine and Environmental Research, Ruđer Bošković Institute, Bijenička c. 54, 10000, Zagreb, Croatia

    Vlado Cuculić, Neven Cukrov, Željko Kwokal, Slađana Strmečki & Marta Plavšić

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  1. Vlado Cuculić
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  2. Neven Cukrov
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  3. Željko Kwokal
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  4. Slađana Strmečki
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  5. Marta Plavšić
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Correspondence to Vlado Cuculić.

Electronic supplementary material

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Online Resource 1

Quality assurance data for voltammetric measurements of trace metals (PDF 99 kb)

Online Resource 2

Complete raw data of trace metal concentration measurements from all three brackish lakes and Kozarica sea water, with sample depths (m) and salinities (XLS 50 kb)

Online Resource 3

Chronopotentiometric determination of catalytically active compounds, CAC (catalytic peaks „H“) for Blato brackish lake, June 2012. Experimental conditions: accumulation potential E a = −0.6 V, accumulation time t a = 60 s, I stripp.= −1 µA; max. time of measurement 5 s (PDF 105 kb)

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Cuculić, V., Cukrov, N., Kwokal, Ž. et al. Assessing trace metal contamination and organic matter in the brackish lakes as the major source of potable water. Environ Geochem Health 40, 489–503 (2018). https://doi.org/10.1007/s10653-017-9935-4

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  • DOI: https://doi.org/10.1007/s10653-017-9935-4

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