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2020, № 4 (42) |
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ECOLOGY
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Popova N.V., Argunov M.A. |
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Ecological assessment of the state of reservoirs – the sources of drinking water supply in rural localities of the Tattinsky district, Yakutia |
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The most unfavorable environmental situation has developed in the household and drinking water supply of rural territories of the Republic of Sakha (Yakutia) in recent decades. The article presents the results of studies on the ecological state of reservoirs of water supply sources for the population and agricultural enterprises of the Tattinsky ulus (district) in Central Yakutia. Hydrochemical, sanitary-microbiological and parasitological studies of water were carried out. According to organoleptic indicators, the water quality does not meet the regulatory requirements for color. Excess of regulatory requirements for magnesium and calcium was revealed. Thus, the content of magnesium in lake water varies from 112.0±1.155 to 734.167±5.716 mg/l; of calcium – from 252.605±7.264 to 361.910±1.974 mg/l. The concentration of fluorides significantly exceeds the MPC from 11.4 to 23.3 times in the water of most of the lakes. All lake water samples contain heavy metals (Zn, Cu, Cd) in concentrations not exceeding the standard values. A slight excess of lead was found in the water of some lakes - from 1.6 MPC to 2.1 MPC. An increased content of ammonium nitrogen in the water of the following lakes: Ytyk-Kyuel (3,577±0.294 mg/l), Kyiy (2,783±0.145 mg/l), Borobul (3,682±0.117 mg/l), Kien Sysyy (2,804±0.126) mg/l was detected. The results of sanitary and parasitological research show that eggs of pathogens of bovine paramphistomatosis, fish ligulidosis, and carnivorous diphyllobotriosis were found in the water of some lakes. Thus, the water of the lakes does not meet the sanitary and hygienic standards and standards of the MPC for household and drinking purposes. Water bodies are polluted by sewage from settlements and agricultural enterprises
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