Humankind is increasingly asking for more and more water both for different uses and as emissary for waste removal. This draw to the conclusion that water is closely related to the land ecological system and to maintain the balance of this system and to survive humankind needs to take measures for the preservation and conservation of the hydrosphere worldwide. This paper presents the quality of the Lake Poiana Mărului as a component of the site Natura 2000 ŢARCU Mountains. Water was sampled from upstream the dike and from the middle of the lake in March, June, August and October 2014. The main quality indices we determined were pH, content of dissolved oxygen, biochemical consumption of oxygen, chemical consumption of oxygen, content of nitrates and nitrites, ammonia and phosphates, residues, conductibility, turbidity, total water hardness, content of calcium, magnesium, nickel, chromium, copper, zinc, cadmium, and lead. Analyses were made in the Quality Laboratory of Reșița of the Banat Water Basin Administration and results were interpreted and compared with physico-chemical standards stipulated in the Order no. 161/2006. Overall, Poiana Mărului Lake water quality is good, basic, with slightly higher nitrite and nitrate contents and high content of copper.

Lake Poiana Mărului, site Natura 2000 Țarcu Mountains, pH, oxygen regime, nutrients, salinity, toxic pollutants

Presentation: oral