Hydrochemical characteristics of the Karpych lake

Purpose. To assess the current hydrochemical characteristics of water in the Karpych Lake for determination of the possibilities for fish rearing. Methodology. The paper presents the results of determining the hydrochemical composition of water in the Karpych Lake, village Hvozdiv, Vasylkiv district, Kyiv region. The hydrochemical analysis was performed according to standard methods using the photometric method for determining pollutants in surface waters: concentration of ammonium nitrogen (with Nessler's reagent), nitrites (with Griss reagent), nitrates, phosphates (with ammonium molybdate) and total iron (with orthophenanthroline), the chloride content was determined by argentometric titration. The pH was determined electrometrically, and the content of sulfates and dry residue by gravimetric method. All above mentioned methods are key parameters in a comprehensive assessment of the ecological condition of the lake. Findings. The major ingredients of the hydrochemical composition of water, which characterize its physical properties (hydrogen index, suspended solids, hardness), salt (chlorides, sulfates, calcium, magnesium, sodium, bicarbonates), biogenic nitrogen (ammonium nitrogen, nitrites, nitrates), phosphates, iron were studied and analyzed in laboratory conditions. The results of laboratory measurements of the chemical composition of water samples, as well as the analysis of maximum allowable concentrations of substances for water bodies of fishery importance (MACrg) give grounds for certain conclusions of the current hydrochemical state of water of the studied lake Karpych. Originality For the first time, an assessment of the current hydrochemical characteristics of water in the Karpych Lake was conducted to determine the possibilities of fish rearing. Practical Value. The obtained results are necessary to establish the possibilities of using the Karpych Lake for growing and breeding commercial fish.