Organic Matter of Bottom Sediments of the Crimean and Caucasian Coasts (Azov and Black Seas)

E. A. Tikhonova

A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Sevastopol, Russia

e-mail: tihonoval@mail.ru

Abstract

As part of the 113d cruise of the R/V “Professor Vodyanitsky”, research was conducted on organic pollution of bottom sediments in the coastal areas of Crimea and the Caucasus, as well as the water area in front of the Kerch Strait. Concentration of chloroform-extractable substances was determined by the weight method and that of petroleum hydrocarbons was determined using infrared spectrometry. Both in 2020 and 2016 (the 83d cruise of the R/V “Professor Vodyanitsky”), properties of the bottom sediments of the Crimean and Caucasian coasts were typical of the marine soils of this region. This indicates that the studied water areas are generally in good condition. In accordance with the regional classification of bottom sediment pollution, the maximum concentrations of chloroform-extractable substances obtained for both the Black Sea and the Sea of Azov coast indicate pollution level III (23% of analysed samples). These values were found in bottom sediments in the Sevastopol water area (225 mg·100 g-1), in the coastal area of Cape Tarkhankut (120 mg·100 g-1) and Karadag (120 mg·100 g-1), the southern part of the Sea of Azov (125 mg·100 g-1) and Tuapse (110 mg·100 g-1). The content of chloroform-extractable substances in bottom sediments off the Black Sea coast of the Caucasus and the Sea of Azov coast is slightly lower than that off the Crimean coast. Pollution level II is assigned to bottom sediments in 46 % of the samples, with an average concentration of 72 mg·100 g-1 of air-dry solids. The rest (31 %) of the studied area was classified as conditionally clean (pollution level I, i. e. less than 50 mg·100 g-1). There has been a slight increase in the concentration of petroleum hydrocarbons in the bottom sediments of both the Black Sea and the Sea of Azov and their share in the total amount of chloroform-extractable substances. In general, the level of pollution of bottom sediments by organic matter remained unchanged if compared with previous years, in particular with the data from 2016.

Keywords

coastal waters, bottom sediments, chloroform-extractable substances, petroleum hydrocarbons, Azov Sea, Black Sea

Acknowledgments

The author is grateful to N. V. Burdiyan, Ph.D. (Biol.), the leading research associate of the Marine Sanitary Hydrobiology Department of IBSS, for the organization and sampling of bottom sediments during the 113th cruise of the R/V “Professor Vodyanitsky”. The work was performed under state task of IBSS on topic “Molismological and biogeochemical foundations of the marine ecosystems homeostasis” (no. 121031500515-8).

For citation

Tikhonova, E.A., 2021. Organic Matter of Bottom Sediments of the Crimean and Caucasian Coasts (Azov and Black Seas). Ecological Safety of Coastal and Shelf Zones of Sea, (3), pp. 52–67. doi:10.22449/2413-5577-2021-3-52-67 (in Russian).

DOI

10.22449/2413-5577-2021-3-52-67

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