Evaluation and characterization of selected pollutants in condition of surface water sources

High quantities of organic matter can reduce the chemical and biological quality of river water. The key indicator of the oxygenation status of water bodies is the biological oxygen demand (BOD) and ammonium. These are main indicators for the water quality classification. Although countries have different river classification schemes they give a general indication of river quality, respective of whether there has been an improvement or not. The paper illustrates the current situation regarding the biological oxygen demand and the concentrations of ammonium in river classification schemes