Gregor Muri and Anton Brancelj
National Institute of Biology, Večna pot 111, 1000 Ljubljana, Slovenia

Abstract
Water quality was analyzed in three Slovenian mountain lakes (i.e., Krnsko jezero, Jezero v Ledvicah and Jezero na Planini pri Jezeru) situated in the Julian Alps, NW Slovenia. Water samples were collected monthly in the ice-free period. The water was examined from chemical, physical and biological points of view to assess the overall status of these lakes. In this paper, only a chemical aspect is reported. Water quality in remote Jezero v Ledvicah is good, while in Krnsko jezero and especially in Jezero na Planini pri Jezeru, both situated close to mountain huts, is worse.