Assessment of the ecological state of the composition of surface waters and bottom sediments in the Yamalo-Nenets Autonomous Okrug

Abstract

The article shows the results of analyzes of surface waters and bottom sediments of the Yamalo-Nenets Autonomous Okrug. The following rivers were selected as objects: the Ob, the Taz, the Pur, the Yuribei etc. Sampling was carried out near settlements Salekhard, Nadym, Salemal, Pitlyar etc. Water samples were analyzed for the content of: dissolved oxygen, chemical oxygen demand, concentrations of oil products, iron, copper, zinc, nickel, manganese, sulfate ions, bottom sediment samples - for pH values of water extract, content of oil products, sulfates, iron, nickel, chromium, manganese, copper, mercury, lead, zinc, cadmium. Excesses of concentrations of iron, manganese and copper (relative to standard values) were found in most water samples. Elevated levels of petroleum products, lead, chromium, zinc, nickel, iron, manganese and copper (compared to the approved background values) were detected in many bottom sediment samples.