... properties of the samples of river water with solutions (considered as standard) containing HAs and FAs in different concentrations. Design/methodology/approach The author sampled two typical unpolluted rivers of Karelian Isthmus (Leningrad Region, North-Western Russia) with different water colours...

...Alexandra Rizhinashvili Purpose The purpose of this paper is to compare trophic characteristics of the ecosystems of small and shallow lakes with a different character of land-cover in their catchments (as exemplified by several previously unstudied lakes of the Leningrad Region, North-Western...