Evaluation of the Potential Release Tendency of Metals and Metalloids from the Estuarine Sediments: Case Study of Raša Bay

April 29, 2022

CRAES,Ru ¯der Boškovi´c Institute, uses EasySensor DGT to publish the article as below:


Assessing the environmental quality of coastal systems is important not only for the management and protection of such areas, but also for improving the quality of water resources. Since sediment itself can often be a source of certain toxic elements, in addition to information on the distribution of metals in the water column and in the sediment itself, it is useful to determine the bioavailable forms of individual elements, particularly toxic ones. In this study, water and sediment geochemical data were supplemented with oxyanion mobility in sediments estimated by diffusion gradients in thin film (DGTs). The data obtained indicate that the chemical composition of the water in the Raša River estuary primarily reflects the high input of suspended sediment from the catchment, the mixing of freshwater and seawater, and to a lesser extent the effects of anthropogenic activities. Although sediment composition is primarily determined by geological and hydrodynamic conditions in the catchment, it also indicates moderate enrichment in Co, Cr, Mo and Ni. In contrast, the distribution of oxyanions in sediment pore water indicates the influence of sediment as a source of some elements in the bottom water; e.g., sediment contributes to 40% of the arsenic bottom water budget. The obtained depth profiles of the oxyanion distribution in the sediment pore water indicate an early onset of suboxic to anoxic conditions in Raša Bay, which is prone to rapid sedimentation. All this demonstrates the need to consider the bioavailable forms of elements when assessing environmental quality, as the lack of such information can lead to an incomplete assessment, especially in dynamic coastal systems such as estuaries. View Full-TextKeywords: estuarine sedimentsoxyanionsDGTgeochemical composition

Figure 2. Vertical distributions of DGT-labile As, Cr, Mo, Sb, V and Se in the sediment-overlying water profifiles at studied locations.

(a) Map of the study area, its geographical position; (b) Sampling area; (c) A more detailed view of the research area (d) Studied estuary, with indicated sampling sites.

Writers:Fiket, Ž.; Petrovi´c, M.; Meduni´c, G. et al., Evaluation of the Potential Release Tendency of Metals and Metalloids from the Estuarine Sediments: Case Study of Raša Bay. Molecules 2021, 26, 6656.https://doi.org/10.3390/molecules26216656.