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минерализация водные объекты магистерская диссертация озёра acid neutralizing capacity acidification arctic small lakes assessment of ecological state autochthonous and allochthonous organic matter biochemical transformation buffering capacity complex composition of waters eutrophication factors of formation of the aquatic environment forms of occurrence of metals humic acid humic substances humification hydrochemistry hydrogen carbonates limitation mineralization nitrogen forms nutrients petroleum hydrocarbons small lakes trace elements trophic state zonal features