Hydrogeochemical Conditions in Southeastern Western Siberia:
the Evidence from the Tom River Basin

N. M. Rasskazov and O. G. Savichev

Institute of Oil and Gas Geology, Tomsk Department, Siberian Division,
Russian Academy of Sciences, Tomsk, Russia

Received February 10, 1998

Abstract—Geochemical conditions of groundwater and surface water in southeastern Western Siberia (the
Tom River basin) are considered. Four hydrogeochemical areas with different natural conditions and the degree
and character of the anthropogenic influence on groundwater and surface water are distinguished as a result of
hydrogeochemical observations for more than a 20-year period, first of all on the basis of our studies. The left
bank of the Tom River in its middle and a portion of its lower reaches is most affected by human activity. The
anthropogenic influence is shown not only in increased oxidation and concentration of a number of elements
(Fe, Mn, etc.) in water of the Tom River and some of its large tributaries, but also in annual distribution of these
elements, e.g. in increased oxidation ability of river water during winter seasons. The overall environmental
condition of the groundwater is more propitious; however, in some areas, water is greatly affected by human
economic activity.