EVALUATION OF ISHIM RIVER WITHIN THE TYUMEN REGION
Water is one of the main strategic resources of any nation. An urgent problem of our time is the deterioration of the quality of natural waters and the state of water systems as a result of increased human activities. The accumulation and dispersion of anthropogenic substances on the planet have left aside the fresh- water ecosystems, water quality which has changed significantly over the past decade. It is believed that a decisive role in water pollution making activities of dustrial enterprises, which send their discharge into rivers and oceans. Modern agriculture with its massive development of livestock breeding, intensive fertilizatiand use of plant protectproducts puts No less contribution to water pollution. Discharges of municipal waters also play a role in shaping the quality and quantity of surface waters. The object of the study was the river Ishim within the Tyumen region. Water samples in four points were collected for its assessment: both above and below the city Ishim, village Ilinka, village Abatskii. Analysis of the results shows that the water of the river Ishim refers to "dirty" category, because there are excess of maximum permissible concentration for many substances. The highest concentration in the r. Ishim observed in summer and winter due to the stagnation of water. A characteristic feature of pollution is that the border with Kazakhstan, the point selection (v. Ilinka) registered the highest concentrations of heavy metals, indicating the transboundary transport of substances.