Abstract
The results of the study of the ecological condition of small watercourse in the areas of influence of various mainly organic, agricultural sources of pollution are presented. In terms of contamination with organic matter and compounds of biogenic elements, the watercourse belongs to the category "very dirty" and hypertrophied. Ammonium ions are shown to be a priority pollutant of the watercourse. Biotesting and laboratory modeling methods have studied their effect onDaphnia magna Sr.hydrobiont filters on the mortality of the daily young with 96 hours of cultivation. It has been established that nitrifying bacteria have a wide range of tolerance to ammonium nitrogen. The optimal concentration for their life is the concentration of NNH4+and 3.2 mg/dm3. Ammonium nitrogen is toxic toDaphnia magna Sr.freshwater rhacies at a concentration of more than 4 MPC (1.6 mg/dm3). It is noted that the system of environmental control of small rivers should be revised towards tightening, since it is the small watercourses that serve as the numerous primary contaminants of large river basins.
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