Polarography of the bottom sediments in the Sevastopol Bay

2009 ◽  
Vol 19 (2) ◽  
pp. 111-123 ◽  
Author(s):  
N. A. Orekhova ◽  
S. K. Konovalov
Keyword(s):  
Bottom Sediments ◽  
Sevastopol Bay

scholarly journals Peculiarities of Macro- and Microelement Accumulation in Bottom Sediments of the Crimean Coastal Water Areas (the Black Sea) with Different Water Exchange Intensity based on XRF Data

2021 ◽  
Author(s):  
E. A. Kotelyanets ◽  
Keyword(s):  
Black Sea ◽  
Bottom Sediments ◽  
Water Exchange ◽  
Fluorescence Analysis ◽  
The Black Sea ◽  
Geochemical Background ◽  
Local Pollution ◽  
Kerch Strait ◽  
Sevastopol Bay ◽  
High Concentrations

The paper analyzes content and spatial distribution peculiarities of macro- and microelements in the bottom sediments of Sevastopol bays, Feodosiya Gulf and Kerch Strait. Bottom sediment sampling was performed from 2005 to 2008 as well as in 2015, 2016, and 2018. Concentrations of macro- (Ti, Fe, Mn) and microelements (As, Pb, Zn, Cu, Ni, Co, Cr, V, Sr) were studied by X-ray fluorescence analysis using Spectroscan MAKS-G spectrometer. The maximal content of Cr, Co, Ni, Zn, Pb, Sr exceeding the geochemical background was found in the water areas with difficult water exchange, which include bays of the Sevastopol region under intense anthropogenic influence: the Yuzhnaya Bay, Gollandiya Bay and Kilen-Bay. In the Kazachya Bay, the least polluted in the Sevastopol bay system, the content of Cr, Co, Ni, Zn, Pb, As, Sr also exceeded their geochemical background. As illustrated by the Balaklava Bay, the paper shows the influence of local pollution sources (the Balaklavka River runoff and municipal waste water) on the microelement distribution. Sevastopol bays are characterized by high concentrations of the studied elements in the bottom sediments. In the water areas with active water exchange, i. e. Feodosiya Gulf and Kerch Strait, concentration of the studied elements, except for Ni, Zn and Cr, did not exceed on the average the geochemical background of the open Black Sea shelf areas.

scholarly journals Biogeochemical characteristics of the Sevastopol Bay sedimentation self-purification from radionuclides, mercury and chlorogenic contaminants

2018 ◽  
Vol 3 (2) ◽  
pp. 40-52 ◽  
Author(s):  
V. N. Egorov ◽  
S. B. Gulin ◽  
L. V. Malakhova ◽  
N. Yu. Mirzoyeva ◽  
V. N. Popovichev ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Marine Ecosystems ◽  
Concentration Coefficient ◽  
Chemical Pollutants ◽  
Sevastopol Bay ◽  
Using Data ◽  
Sedimentation Processes

The work is focused on the study of characteristics of sedimentational self-purification from radioactive and conservative chemical pollutants in Sevastopol Bay waters. Using data on the distribution of 90Sr, 137Cs, 239,240Pu, 210Po, Hg, ΣPCB5, and ΣDDT in the surface (0–5 cm) layer of bottom sediments in different areas of the bay, it is shown that the concentrating ability of living and inert matter concerning contaminants (characterized by the concentration coefficient) is one of the major parameters in realization of biogeochemical mechanism of water self-purification. The effect of sedimentation processes is aimed at maintaining the radionuclides and chemical homeostasis of marine ecosystems by the Le Chatelier – Brown principle. Hg, ΣPCB5 and ΣDDT are shown to be the main pollutants of Sevastopol Bay waters at present.

scholarly journals Polycyclic Aromatic Hydrocarbons in the Bottom Sediments of the River – Sea Mixing Zone on the Example of the River Chernaya and the Sevastopol Bay (the Black Sea)

2021 ◽  
Vol 28 (3) ◽  
Author(s):  
O. V. Soloveva ◽  
E. A. Tikhonova ◽  
O. A. Mironov ◽  
T. O. Barabashin ◽  
◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Contact Zone ◽  
Bottom Sediments ◽  
Aromatic Hydrocarbons ◽  
High Performance ◽  
River Estuary ◽  
The Black Sea ◽  
Chromatography Method ◽  
Sevastopol Bay ◽  
Polycyclic Aromatic

Purpose. The study is aimed at determining concentrations of the polycyclic aromatic hydrocarbons (PAHs) and at revealing their pattern distribution in the bottom sediments of the "river – sea" contact zone on the example of the Sevastopol Bay and the river Chernaya. Methods and Results. Granulometric composition of the bottom sediments was determined by the decantation and dispersion method. Identification and quantitative determination of PAHs were carried out by the high performance liquid chromatography method. The total PAHs content in the bottom sediments of the area under study varied from 12 to 670 ng/g of dry weight. The pollutant content was minimum in the river site beyond the geochemical barrier. In the area where the river Chernaya flows into the Sevastopol Bay, the PAHs content was 121 ng/g. The highest PAHs content was revealed in the Sevastopol Bay bottom sediments, more precisely, in 1.5 km southwest of the river Chernaya flowing into the bay. 14 PAHs were identified in the estuary zone of the river, 4 of them (naphthalene, 2-methylnaphthalene, fluorene, anthracene) were in the trace amounts. The maximum concentration (99%) of silty material was observed in the Sevastopol Bay water area. The silt fractions were distributed as follows: 20% – aleuritic-pelite fraction, 79% – pelitic-aleurite fraction. Directly in the area of the river inflow into the bay, accumulation of the sand fraction (7%) and the maximum portion of pelitic silts were noted. Conclusions. The recorded values of PAHs corresponded to the natural non-toxic levels. PAHs identified in the bottom sediments of the river estuary zone are of the mixed, predominantly petrogenic origin. The obtained data show that in the conditions of the "river – sea" contact zone, the PAHs accumulation in general and their individual fractions were governed mainly by presence of silt in the bottom sediments.

Analysis of state of the carbonate system of waters and variations of the content of organic carbon in bottom sediments of the Sevastopol bay in 1998–2005

2008 ◽  
Vol 18 (2) ◽  
pp. 96-105
Author(s):  
O. G. Ignat’eva ◽  
E. I. Ovsyanyi ◽  
A. S. Romanov ◽  
S. K. Konovalov ◽  
N. A. Orekhova
Keyword(s):  
Organic Carbon ◽  
Bottom Sediments ◽  
Carbonate System ◽  
Sevastopol Bay

Rating Water Quality in Sevastopol Bay by the Fluxes of Pollutant Deposition in Bottom Sediments

2018 ◽  
Vol 45 (2) ◽  
pp. 222-230
Author(s):  
V. N. Egorov ◽  
S. B. Gulin ◽  
L. V. Malakhova ◽  
N. Yu. Mirzoeva ◽  
V. N. Popovichev ◽  
...  
Keyword(s):  
Water Quality ◽  
Bottom Sediments ◽  
Pollutant Deposition ◽  
Sevastopol Bay

scholarly journals Anthropogenic plutonium radioisotopes in the ecosystem components of Sevastopol Bay (the Black Sea)

2021 ◽  
Vol 937 (2) ◽  
pp. 022075
Author(s):  
A Paraskiv ◽  
N Tereshchenko ◽  
V Proskurnin ◽  
O Chuzhikova-Proskurnina ◽  
A Trapeznikov ◽  
...  
Keyword(s):  
Surface Layer ◽  
Black Sea ◽  
Bottom Sediments ◽  
Activity Concentration ◽  
The Black Sea ◽  
Published Data ◽  
Sevastopol Bay ◽  
Deposition Density ◽  
Concentration Factors ◽  
Accumulation Ability

Abstract Modern levels (2010-2020) of 239+240Pu activity concentration in Sevastopol Bay (Black Sea) surface waters, 0-5 cm layer of bottom sediments and hydrobionts were determined by multistage radiochemical technique. The 239+240Pu activity concentrations in Sevastopol Bay surface water were on relatively low level: 1.08±0.09 - 1.54±0.17 mBqnr3. The maximum value of 239+240Pu activity concentration in the bottom sediments surface layer was observed in Sevastopol Bay mouth (993±90 mBqkg1) and it decreased with distance from the bay entrance to its tail end down to the minimum value - 276±53 mBqkg1. Based on these results as well as on published data the 239+240Pu deposition density distribution in the bay boxes and their inventory in 0-5 cm layer of bottom sediments were estimated in every boxes. Total 239+240Pu inventory in the bottom sediments surface layer was estimated at 121 MBq, with the highest deposition density value determined in the mouth part of the bay. Among studied hydrobiont species the highest 239+240Pu content was determined for mollusks (for their shells) Mytilus galloprovincialis (Lamarck, 1819) while the lowest - for fish Scorpaena poreus (Linnaeus, 1758). Accumulation ability of studied ecosystem components of Sevastopol Bay against 239+240Pu was characterized by evaluating concentration factors (Cf). It was shown that the bottom sediments of the bay were the main depot for plutonium anthropogenic radionucludes (Cf (239+240Pu) = n-105). The Cf (239+240Pu) were from two to three orders of magnitude lower for the hydrobionts of the bay: n-103 for brown algae and mollusks and n-102 for green algae and fish.

Polycyclic Aromatic Hydrocarbons in the Bottom Sediments of the River – Sea Mixing Zone on the Example of the River Chernaya and the Sevastopol Bay (the Black Sea)

2021 ◽  
Vol 37 (3) ◽  
Author(s):  
O. V. Soloveva ◽  
E. A. Tikhonova ◽  
O. A. Mironov ◽  
T. O. Barabashin ◽  
◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Contact Zone ◽  
Bottom Sediments ◽  
Aromatic Hydrocarbons ◽  
High Performance ◽  
River Estuary ◽  
The Black Sea ◽  
Chromatography Method ◽  
Sevastopol Bay ◽  
Polycyclic Aromatic

Purpose. The study is aimed at determining concentrations of the polycyclic aromatic hydrocarbons (PAHs) and at revealing their pattern distribution in the bottom sediments of the "river – sea" contact zone on the example of the Sevastopol Bay and the river Chernaya. Methods and Results. Granulometric composition of the bottom sediments was determined by the decantation and dispersion method. Identification and quantitative determination of PAHs were carried out by the high performance liquid chromatography method. The total PAHs content in the bottom sediments of the area under study varied from 12 to 670 ng/g of dry weight. The pollutant content was minimum in the river site beyond the geochemical barrier. In the area where the river Chernaya flows into the Sevastopol Bay, the PAHs content was 121 ng/g. The highest PAHs content was revealed in the Sevastopol Bay bottom sediments, more precisely, in 1.5 km southwest of the river Chernaya flowing into the bay. 14 PAHs were identified in the estuary zone of the river, 4 of them (naphthalene, 2-methylnaphthalene, fluorene, anthracene) were in the trace amounts. The maximum concentration (99%) of silty material was observed in the Sevastopol Bay water area. The silt fractions were distributed as follows: 20% – aleuritic-pelite fraction, 79% – pelitic-aleurite fraction. Directly in the area of the river inflow into the bay, accumulation of the sand fraction (7%) and the maximum portion of pelitic silts were noted. Conclusions. The recorded values of PAHs corresponded to the natural non-toxic levels. PAHs identified in the bottom sediments of the river estuary zone are of the mixed, predominantly petrogenic origin. The obtained data show that in the conditions of the "river – sea" contact zone, the PAHs accumulation in general and their individual fractions were governed mainly by presence of silt in the bottom sediments

scholarly journals Oxygen absorption in the oxidation of organic compounds in the coastal sediments of Sevastopol (the Black Sea)

2016 ◽  
Vol 1 (4) ◽  
pp. 44-52
Author(s):  
V. P. Chekalov
Keyword(s):  
Surface Layer ◽  
Organic Compounds ◽  
Bottom Sediments ◽  
Coastal Sediments ◽  
The Black Sea ◽  
Utilization Rate ◽  
Oxygen Absorption ◽  
Potential Contribution ◽  
Sevastopol Bay ◽  
Oxidation Of Organic Compounds

The formation of the oxygen regime of water bodies is closely related to the intensity of the biological processes in the bottom sediments. The aim of this work was the defining the role of  different groups of bacteria in the utilization of oxygen in the oxidation of organic compounds in the sediments of the coastal areas of Sevastopol, including using original methodological approaches. The total oxygen absorption of the bacterial community is considered as set of processes of aerobic utilization and oxidation of the reduced products of anaerobiosis. Oxygen absorbed in 0.01-cm surface layer is about 40 %. The values of oxygen flux through a unit surface of various mechanical composition of bottom sediments were quite comparable due to differences in the bacterial density and the depth of penetration of oxygen. The values of aerobic oxygen absorption changed from the mouth to the inner part of Sevastopol Bay from 2.69 to 1.82 mkgO2·sm-2·h-1. Utilization rate of organic carbon in the surface layer of Sevastopol Bay sediments was evaluated within 1.57–2.76 mkgС·sm-2·h-1 and reached 1.13 and 0.34 mkg in paleoriverbeds of Chernaya and Belbek. The production of reduced compounds in recalculation on H2S ranged from 0.096 to 0.65 mkg·sm-2·h-1. The share of active anaerobic microflora of the maximum possible in conditions of real temperature was 7.5–87.5 % and oxyphilic — 0.2–31 %. Thus, the ratio of aerobic oxygen demand and, through metabolism products oxidation, anaerobic microbiota determines their potential contribution to processes of decomposition of organic matter. However, realization of this possibility is limited by the factors of actual oxygen content and temperature.

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