2. Articole

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    STAREA ACTUALĂ A NISTRULUI INFERIOR ȘI A AFLUENȚILOR SĂI DE DREAPTA PE TERITORIUL REPUBLICII MOLDOVA ÎN PRIMĂVARA ANULUI 2024
    (CEP USM, 2024) Jurminskaia, Olga; Şuberneţkii, Igor
    The aim of the paper is to assess the ecological state of the Lower Dniester and its right tributaries - the Răut, Bâc and Botna rivers. During the spring 2024 expeditions to the Dniester River Basin within the Republic of Moldova, the Laboratory of Hydrobiology and Ecotoxicology of the Institute of Zoology collected samples for hydrochemical, microbiological and hydrobiological investigations. The results of determinations of hydrochemical parameters such as water temperature, hydrogen ion concentration, dissolved oxygen concentration and biochemical oxygen demand are used in the presented paper. Determination of the quality classes was carried out on the basis of the limit values of quality indicators regulated by the normative document of the RM in the field of water legislation.
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    DINAMICA FORMELOR DE AZOT ÎN FLUVIUL NISTRU
    (CEP USM, 2024) Borodin, Natalia; Bagrin, Nina
    The present investigation provides data of some ions, namely N-NH4+, N-NO2-, N-NO3-, Nmin, Norg, Ntot, in water samples collected from the Dniester River during spring in 2024. In the study are examines the spatial dynamics of the forms of mineral nitrogen, total nitrogen and the correlation between organic and mineral nitrogen. The content of nitrates, nitrites and ammonium ions was determined by the spectrophotometric method to the spectrophotometer UV-VIS Specord 210 Plus. The pH, temperature, have also been determined to asses the chemical status and pollution levels of these water sources. Limits of ammonium ion concentration in the Dniester River varied between 0.045 mg N/L and 0.722 mg N/L, nitrite ions 0.007 mg N/L and 0.031mg N/L, nitrate ions 0.083 mg N/L-1.492 mg N/L. Higher ammonium concentrations could be observed at the point Vadul-lui-Vodă and it was 0.722 mg N/L, which gave the water the 3rd quality class (moderately polluted). The main form of nitrogen is nitrate ion. Along all the Dniester River there is a dominance of mineral nitrogen which makes up more than 50% of the total nitrogen content.