Some results of analyses heavy metals, organic and other matter are represented at the confluence of the tributaries and meddle Ob and places of industrial centers, there an increased contaminants of bed sediments are determined. Priority metal contaminants are Fe, Zn, Cu, Pb and Cd.

The red-ox barrier on interface water-interstitial water-bed sediment play the leading role in transformation of chemicals, including heavy metals, there negative gradient of concentration of dissolved oxygen and positive gradient hydrogen protons and cations of metals. Heavy metals interact with reduced sulfurspecies and organic matter and confirm the biogenic mechanism of transformation in chemistry of surface water.

Acidity of interstitial water in bed sediments and negative Eh lead to accumulation of heavy metals, especially with high temperature and high concentration of organic matter in conditions of biochemical consumption of oxygen by heterotrophs.