SPATIAL AND SEASONAL VARIATIONS IN THE TOTAL CONTENT OF PETROLEUM PRODUCTS IN SURFACE WATERS OF THE TOBOL RIVER (WITHIN THE KURGAN REGION)

The Tobol River is the main water artery of the Kurgan region, providing the region’s population with drinking and household water, which necessitates environmental and analytical studies of the river. The main water pollutants of the Tobol River are compounds of manganese, copper, iron, easily oxidized organic substances and those resistant to oxidation, and also oil products. The article presents the results of a study of the Tobol River water within the territory of the Kurgan region conducted to find the content of oil products. Water samples were taken from the river at five observation site during the main hydrological phases: May – spring flood, September – summer-spring low water, and February – winter low water. Based on the chemical analysis, the shares of the maximum allowable concentrations of oil products in the water of the Tobol River were calculated, the territorial location of observation sites with the excess of the maximum allowable concentrations of oil products was studied, and the mass of oil products in the studied sections was determined. The alleged sources of oil products entering surface waters of the Tobol River are indicated.