Distribution of Redox-sensitive Elements in Bottom Waters,Porewaters and Sediments of Rogoznica Lake (Croatia) in Both Oxic and Anoxic Conditions |
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Authors: | Irena Ciglene?ki Sr?an Pichler Esad Prohi? Bo?ena ?osovi? |
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Institution: | (1) Department of Marine and Environmental Research, Ruđer Bošković Institute, Bijenička 54,, 10000 Zagreb, Croatia;(2) Department of Mineralogy and Petrography, Faculty of Science, University of Zagreb, Horvatovac bb, Zagreb, Croatia |
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Abstract: | Geochemical, mineralogical and sedimentological analyses were carried out to contrast two different sites (respectively characterized
by permanently oxic and anoxic conditions) in a small, meromictic, seawater lake. In fact, due to relatively high organic
matter content, and reduced water exchange, the Rogoznica Lake has almost permanent anoxic conditions below the depth of 12 m,
where sediment can be considered an anoxic–sulphidic sedimentary environment. Different water column and sediments redox conditions
affect the distribution and speciation of major redox-sensitive metals (Fe, Mn, Mo), reduced sulphur species (RSS) and dissolved
organic C (DOC). Trace metals, especially those that accumulate in anoxic–sulphidic environments (Fe, Mo) showed a marked
enrichment in the solid phase, whereas the low solubility of sulphides leads to low porewater concentrations. The relatively
high sedimentary enrichment of Mo (up to 81 mg/kg) also confirms highly anoxic conditions within the Rogoznica Lake sediments.
Results clearly show that chemical species within the sediments will tend towards equilibrium between porewater and solid
phase according the prevailing environment conditions such as redox, pH, salinity, DOC. |
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Keywords: | anoxia geochemistry Fe Mn Mo porewater sulphide sediment Rogoznica Lake |
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