List of parameters:     Water quality     Temperature, pH, conductivity, O2,     Na, K, Ca, Mg, Mn, Fe NH4,     Hg, Zn, As, Cu, Cr, Cd, Ni,     HCO3, Cl, SO4, NO3, NO2, PO4, total P, total N     COD, BOD, suspended silts,     saprobity index, chlorophyll-a, coliform bacteria,     fecalcoli, streptococcus, number of bacteria     number of algae,* zooplanction,* macrobenthos,*     TOC, UV oil, total dissolved solids     Sediment     total P, total N, organic and anorganic micropollutant   Frequency of measurements:   Water quality: 12 times per year (*: 4 times per year)   Sediment: once per year   Methodology: on basis of the Statutes of the Hungarian-Slovak Boundary Waters Commission, Statute of the Water Quality Succommision, Annex 5