Evaluation of the trophic level and self-cleaning ability of small flows by hydrochemical indicators (through the example of the Rpen River)

Aim. Assessment by nitrification index values of the level trophicity and toxicity for aquatic organisms in waters a small watercourse an urbanized area content nutrients water its selfcleaning ability. Materials Methods. The concentration compounds river was determined using "Kapel 104T." system capillary electrophoresis. Water sampled analysis according to GOST R 51592- 2000. readily oxidized organic assessed magnitude permanganate oxidizability (PND F 14.1; 2.4.154-99) difficultly chemical oxygen consumption (RD 52.24.421-2012). trophic evaluated measuring various forms mineral nitrogen phosphorus. aggregation characterizing calculated their ratio MPC fishery reservoirs. nitrifying ability estimated value (Initr.), nitrates sum concentrations self-cleaning index. Results . In terms index, at all sampling points found be toxic. ecosystem is characterized weak cleanse itself ability, which associated with influence numerous cyanotoxins on microbiocenosis filtration organisms. Conclusion. It shown that most sensitive indicator Through phosphorus, it established blue-green algae (cyanobacteria), producers cyanotoxins, dominate phytoplankton studied.