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The cascade water system of the Azov Sea basin is a set of geochemical barriers. Here, water masses of different mineralization mix, and the hydrological and hydrodynamic conditions change. As a result, there is a sharp change in the physical, chemical, and biogeochemical characteristics of all components of the aquatic ecosystem, including bottom sediments. Bottom sediments are a more conservative component of the aquatic landscape in comparison with the water mass. The content of pollutants in the samples taken ...

The article presents the data obtained by the authors during the expedition research in the largest bay of the Azov Sea - the Taganrog Bay. Its characteristic feature is shallowness, flowing due to water exchange with the Don, small rivers, and the development of surge phenomena. The ecosystem of the bay has been experiencing strong anthropogenic pressure for several decades. The authors analyzed the behavior and distribution of mercury dissolved and suspended forms in the surface and bottom layers of water, depen...

The article presents a detailed study of the close relationship between the content of total dissolved iron (Fetotal), Fe2+, Fe3+ on the one hand and physical and chemical parameters (Eh, pH, salinity (S), water temperature, electrical conductivity (Cond), the content of molecular oxygen and its saturation percentage in the section "Don River - Sea of Azov" on the other under various weather conditions. Correlation coefficients, as a quantitative measure of the tightness of the connection, varied over a wide range...

The long-term and high-level anthropogenic load on the aquatic ecosystem increases the probability of its adverse transformations (violations of the natural stability of its state and, as a result, the appearance of negative situations). These include diverse geochemical, biogeochemical, pathogenic biological, and, ultimately, medical and environmental consequences caused by the entry and further redistribution, and accumulation in water of highly toxic chemicals, among which heavy metals such as mercury take prio...

The Azov Sea is one of the shallowest inland reservoirs in Eurasia. The special physical and geographical location of that object determines the temporal variation of its hydrological and hydrochemical characteristics. One of the main features of the sea is the presence of run-off and surging phenomena, determined by water exchange with the Black Sea and the river flow, small area and shallow water body. The currents are considered as significant factors for many processes of matter and energy transport in the Azo...

The Sea of Azov is characterized not only by small sizes and depths for oceanic waters, but also by intensive water exchange with river waters and the waters of the Black sea. These features of the reservoir are superimposed by wind activity, which contributes to the formation of wind surges phenomena. Under their influence, the upper layer of bottom sediments is agitated, accompanied by the transition of previously deposited material into the water column. After the wind action is weakened, the reverse flow of re...

The results of the exploration of the dynamics of water level in the lake Bolshoy Tambukan for the period of more than 230 years is given. Lake Bolshoy Tambukan is a large deposit of peloids in the south part of Russia. Two periods of development of the lake are revealed: natural and natural-anthropogenic. Currently, there is a catastrophic rise of water in the lake and a decrease in its mineralization below 25 g/l. Data on fluctuations of mineralization and the most significant natural and anthropogenic events ar...

Uranium-238 is a parent radionuclide for several radioactive stable chemical elements, which presence in the therapeutic mud can cause negative consequences for patients. This paper presents the results of the study of the U-238 specific activity in the mud sediment cores of Pelenkino Lake and Bolshoi Tambukan Lake situated in two different geological and hydrological regions in the south of European Russia. The relationship between the U-238 specific activity in the mud, its pH, Eh values and the organic matter c...

Hydrogen sulfide is a gas that is formed in various water bodies due to the flow of sulphate reduction and putrefaction of organic matter of bottom sediments. Hydrogen sulfide can also get in the water of reservoirs and watercourses with wastewater of various industries and farms. In the water objects of fishery and drinking water use concentration normalized, since due to the toxicity of hydrogen sulfide deteriorates the water quality, occur hypoxic effects and death of aquatic organisms, while for ponds with mud...

Terrestrial and submarine mud volcanoes of the Taman Peninsula are confined to the continuation of the Temryuk-Kerch anticline zone. Many of them, especially submarine volcanoes, are characterized by periods of active spontaneous activity. Mud volcanoes are of interest as not only objects that can have a negative impact on the natural environment, but also as sources bringing benefits in the form of erupted mud masses that are used to treat people. Up to this point, the question of the depth and temperature of the...

The concern about the environmental contamination by 241Am is caused by the fact, that its half-life period is longer and its mobility is much higher than that of parent plutonium. That is why in soils and sediments the specific activity of the radionuclide increases over time. The alpha-decay energy of 241Am and the relatively short lifetime of the isotope create high specific radioactivity and thermal yield. In bottom sediments, the ratio of 241Am to 241Pu increases every year. All these factors result in a high...

Cesium-137 is a long-lived technogenic radionuclide. The study of its distribution in the environment is important either from ecological point of view or as it may be used as a marker for sediment core dating. Lakes are excellent objects for the application of these approaches. A scientific expedition was carried out in order to extract and to study sediment cores from the beds of Lake Maly Liman, Lake Abrau, Lake Maly Utrish (Municipality of Novorossiysk, Region of Krasnodar), and Lake Bolshoi Tambukan (at the b...

The water column of the Sea of Azov is undergoing significant transformation of Oceanographic characteristics (temperature, salinity, oxygen content). They depend on the seasons and weather situation. In the summer, despite wind activity, observed a classic for the Sea of Azov, the distribution of the parameters: water temperature decrease in the direction of the Don River ? Taganrog Bay ? the central part of the Sea of Azov ? the area of Kerch. In the fall, observed reverse pattern during the relative calm. Durin...

The regularities of distribution of methane and sulfide sulfur (total sulfide пїЅ ?H2S) in the bottom sediment deposits of therapeutic sulfide mud Lake Bolshoy (Big) Tambukan, located in the region of Caucasian Mineral Waters. Determination of methane and sulfide sulfur were produced in black and dark grey therapeutic mud, as well as in the underlying steel-grey clays and coastal sediments, represented by yellow-brown clay and loam. The formation of therapeutic sulfide mud flows through the biogeochemical environm...

The paper provides an analysis of long-term field studies in the Sea of Azov. The sea is rich in organic life and is characterized as one of the most bioproductive reservoirs in the world. During the periods of calm weathe r the stratification of water mass forms the fields of hypoxia in some areas of the sea. In the bottom layers of water pockets of hydrogen sulfide and elevated concentrations of methane and mercury are found. Mercury coming from both natural and anthropogenic sources is a priority pollutant for ...