[Ecologic aspects of the circulation of carcinogenic PAH and heavy metals in the geochemical landscapes of the Ural River basin].

The ecological aspects of the environmental technogenic transformation should be primarily studied with respect to the problem of preventive measures against the carcinogenic action in particular. It is found that in the northern part of the Ural River basin (Chelyabinsk and Orenburg Provinces) the pattern and extent of technogenic load depend on the function of metallurgical works; the surrounding landscapes receive large amounts of scattered metals, especially of Cr, Ni, Pb, Cu, Mn, etc. The technical geochemical peculiarities of the environment in the southern part of the Ural basin (Uralsk and Guryev Provinces) are due to the oil production, transportation and refinement. The high rate of correlate with the content of heavy metals, whereas the rate of esophageal cancer correlates with the quantity of carcinogenic PAH contained in the landscape components.