List of parameters:     Temperature, pH, conductivity, DO2,     Na, K, Ca, Mg, Mn, Fe NH4,     HCO3, Cl, SO4, NO3, NO2, PO4,     COD, TOC     silicates   Frequency of measurements: 4 times per year   Methodology: on basis of the Statutes of the Hungarian-Slovak Boundary Waters Commission, Statute of the Water Quality Succommision, Annex 5