Zn II, Cu II, Pb II, Hg II, Ni II SURVEY AND THE SURFACE WATERS QUALITY EVALUATION IN THE BARCĂU RIVER BASIN (WEST ROMANIA)

The survey of Zn, Cu, Pb, Hg and Ni ions in the surface waters of Barcau River Basin (West Romania), the evaluation of their quality in order to classify them by water quality classes point of view and the analyse of the influence of anthropogenic factors have been made. The water samples were taken from six sampling points, during February-November 2018. Metal ions concentration were measured using atomic absorption method. The smallest quantities of metal ions were registered, as expected, in Tusa, in the upper part of the River Barcău. An increase of metal ions concentrations in the summer months was registered. Smaller metal ions quantities were measure also downstream of Pădurea Neagră City than in the case of the other investigated localities. In Tusa and Padurea Neagră sampling points the surface water can be classified in class I of quality regarding all metallic ions investigated. In Boghiş and Suplacul de Barcău sampling points the surface water was classified in class II and III of quality regarding some of the metallic ions investigated. At the border with Hungary (Parhida) the water of the Barcău River falls in the quality class I in terms of the content of Pb II and Hg II and in the quality class II in terms of the content of Zn II, Cu II and Ni II. In order to prevent pollution of the Barcău River Basin, it is necessary to take measures to remove the wastewater discharge without prior treatment.