HydrochemicalComposition as One of Indicators of Modern Conditions of Lakes Formation (on the Example of Yakutsk City)

Rufova A.A., Ksenofontova M. I.

 

The dynamics of hydrochemical composition of Yakutsk city lakes as one of indicators of modern conditions of the lakes formation is considered. The lakes on their chemical composition belong to sodium bicarbonate group, are medium mineralized, slightly alkaline and moderate hardwater. On macroelement structure the lakes with high and low concentration of macroelements are revealed. Biogenic substances are quite widely presented, some of them considerably exceed maximum permissible concentration for culturally household water use. Such microelements as lead, copper, zinc and manganese are widespread. General tendency of increase of these microelements contents is noted, but not exceeding limits of maximum permissible concentration for culturally household water use. The total specific combinatory index of impurity of the water calculated on which value the studied city lakes belong to the polluted ones. By years of the study the total specific combinatory index of impurity of the water fluctuates from pure to polluted. On the basis of analysis of the references and own conclusions a scheme of anthropogenic influence on surface waters of the lakes of Yakutsk city in three directions – on scale, time and nature of action is developed.

 

Key words:hydrochemical composition, formation of lakes, city lakes, Yakutsk city, macroelements, microelements, biogenic substances, anthropogenic influence.

Science and Education, 2015, No.2, pp.145-151