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ACCUMULATIONS OF TRACE METALS IN BOTTOM SEDIMENTS OF THE SEVASTOPOL BAY (BLACK SEA)
Abstract
The content of pollutants in the bottom sediments of coastal waters with limited water exchange characterize the total load on the water area and catchment of bays. This paper presents the definition of the total content of trace elements such as Cr, Co, Ni, Pb, Zn, V, Sr (mg/kg) and metal oxides TiO2, MnO, Fe2O3 (%). Samples were taken in the surface layer of bottom sediments of the Sevastopol Bay in 2016. The bottom sediments of the Sevastopol bays accumulate a wide range of organic and inorganic pollutants entering the bays from industrial, domestic, agricultural, stormwater, and also from ships. According to the concentration of individual toxicants, bottom sediments of some areas of the Sevastopol Bay are classified as highly polluted, for example, South Bay: the lead content is 534 mg/kg. In comparison with the data obtained in 2002, the content of lead, cobalt, chromium and iron in the water area of South Bay increased. The content of chromium and iron in the area of the central part of the bay, on the contrary, decreased in 2016 in comparison with the data obtained earlier. Also, according to the data of 2016, the maximum concentrations of lead content (756 mg/kg) were detected in the Artillery Bay area. The dynamics of the Sevastopol Bay bottom sediments pollution was assessed by examining the physical (particle size) and chemical (trace element content: Ti, Pb, Zn, Ni, Co, Cr, V, Sr, Fe, Mn), characteristics that determine the anthropogenic press on the water area. As a result of the research, features of the spatial distribution of trace metals were revealed, zones of increased content of Ti, Pb, Zn, Ni, Co, Cr, V, Sr, Fe, Mn in the surface layer of bottom sediments were identified. It was noted that as a result of the intensification of various natural and anthropogenic processes in the water area of the Sevastopol Bay from 2002 to 2016, the ratio of important geochemical parameters significantly changed.
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References9
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