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Ribogospod. nauka Ukr., 2023; 3(65): 20-33
DOI: https://doi.org/10.15407/fsu2023.03.020
UDC 556.531.4(282.247.32)

Assessment of the current hydrochemical state of some fishponds of Kyiv region

L. Dragan, This email address is being protected from spambots. You need JavaScript enabled to view it. , Institute of Fisheries of the National Academy of Agrarian Sciences, Kyiv
N. Mikhailenko, This email address is being protected from spambots. You need JavaScript enabled to view it. , Institute of Fisheries of the National Academy of Agrarian Sciences, Kyiv
T. Bersan, This email address is being protected from spambots. You need JavaScript enabled to view it. , Institute of Fisheries of the National Academy of Agrarian Sciences, Kyiv

Purpose. To assess the quality of the hydrochemical regime of fishponds, the territory of which suffered massive missile strikes or was directly a combat zone or close to the front line.

Methodology. Chemical parameters of water including the content of ammonium nitrogen, nitrites, nitrates, phosphates and total iron were measured by the photometric method, while chloride concentration of chlorides by the argentometric titration method. The hydrogen indicator (pH) was determined electrometrically, and sulfate content and mineralization by the gravimetric method. All the above-mentioned methods are generally accepted in the comprehensive assessment of the ecological state of fishponds.

Findings. The total amount of mineral salts dissolved in water was studied and analyzed in laboratory conditions, namely: the concentrations of calcium, magnesium, chlorine, bicarbonate ions and sulfate ions. The determined permanganate oxidizability in the investigated ponds exceeded the normative values by 72, 49, 31, and 42%, respectively. The concentration of nitrates ranged from 19.96 to 6.34 mg N/dm3, nitrites from 0.33 to 0.11 mgN/dm3, which indicates the intensity of decomposition of organic substances and indicates a certain degree of contamination of ponds. The amount of total iron in the studied ponds ranged from 1.98 to 1.17 mgFe/dm3, respectively. A slight increase in mineral phosphorus in ponds No. 1 and No. 2 was established by 31 and 26%, respectively, which can probably be related to both the decomposition of zooplankton and the input of pollutants from the outside from the surrounding areas. The obtained results of the laboratory analysis of the chemical composition of water samples as well as their comparison with the normative values for water bodies used for aquaculture provide a basis for assessing the current hydrochemical state of the investigated ponds of Kyiv region

Originality. For the first time, a hydrochemical analysis of fishponds in Kyiv Region was conducted, the territory of which suffered massive missile strikes or was directly a combat zone or close to the front line.

Practical value. The obtained results will contribute to a better understanding of the current ecological state of fishponds in Kyiv region.

Keywords: water body, chemical analysis of water, toxic substances, ecological condition.

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