The hydrological, geochemical and bioindicator characteristics of Ilmen lake

Questions of Ilmen lake condition under hydrochemical, geochemical and bioindicator characteristics are investigated. On the basis of the analysis of water samples results, bottom deposits, mollusks from the period of 2008 to 2009 years conclusions on absence of direct dependence between exceeding the maximum concentration limit of heavy metals in water and formations of local points of pollution by heavy metals in bottom deposits are made. Direct dependence between disease of mollusks and quality of bottom deposits is observed.