OIL PRODUCTS IN BOTTOM SEDIMENTS OF PODCHUVASHSKAYA RIVERBED DEPRESSION AT IRTYSH RIVER (TOBOLSK DISTRICT)
This research was done within the Tobolsk district of the Tyumen region in the area of the lower course of the Irtysh River, which is one of the riverbed depression – Podchuvashskaya. These parts of the river are biologically had an important role in the formation and maintaining aquatic biological resources. In the bottom sediment at the cross-sections of the river Irtysh upstream and downstream of riverbed depression determined by chemical analysis of the oil content. Sampling was performed by Petersen bottom grab on board the boat in the coastal zone and the midstream of the river. It is shown that the present oil contaminated bottom sediments, but their excess in comparison with the maximum permissible level insignificant (on average 1.5–2). During the research the highest concentration of oil products were observed in bottom sediments in the cross-sections (№2) where the oil tank farm was located previously.