Состояние качества водной среды и донных отложений озера Донузлав в современный период
Analysis of hydrochemical, chemical and toxicological features of water and bottom sediments in Lake Donuzlav (Crimea, Russia) according to the results of environmental monitorings conducted by the Kerch Branch of FSBSI “AzNIIRKH”, as well as according to the historical data collected by YugNIRO (Southern Scientific Research Institute of Fisheries and Oceanography) since 2000, is presented for the period from 2015 to 2017. Estimations of oxygen content in water, as well as BOD5 (biochemical oxygen demand) and the content of biogenic elements were made using standard practices, of heavy metals — using the method of atomic absorption spectrophotometry, of petroleum hydrocarbons – the method of infrared spectrophotometry. It is found out that the oxygen regimen of the southern Donuzlav L. was satisfactory for hydrobionts: the average annual contents of the dissolved oxygen varied within the range of 8.77–9.40 mg/l. It is shown that seasonal variations of the biogenic elements content are mainly predetermined by natural factors. In general, water aeration was good; however, the oxygen regimen was influenced by anthropogenic pressure, which resulted in relatively low dependency between oxygen saturation and water temperature. The long-term dynamics of the content of heavy metals and petroleum hydrocarbons in the water and bottom sediments of Lake Donuzlav is given. At present, the level of water pollution with heavy metals and petroleum hydrocarbons is rather low; however, there is a risk of aggravation of anthropogenic pressure impact on Lake Donuzlav ecosystem, which is evidenced by peak concentrations of some contaminants, observed in recent years. The increasing trend in mercury, copper and zinc content in the bottom sediments of the southern Lake Donuzlav is shown, as well as the decreasing trend in the content of iron, manganese, lead, chrome and petroleum hydrocarbons. The level of bottom sediments pollution in the central part of the lake is higher in comparison with its other areas, which is preconditioned by a higher sorption capacity of the bottom soil, containing high amount of fine particle fraction.
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2018
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| Subjects: | Bottom sediments, Chemical composition, Toxicology, Long-term data, Environmental monitoring, Copper, Mercury, Zinc, Dissolved oxygen, Heavy metals, Petroleum products, Lead, Iron, Marine pollution, ASFA_2015::M::Marine pollution, |
| Online Access: | http://hdl.handle.net/1834/14185 |
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