Question: what ions are present in the water?
Answer: The list of the main dissolved mineral components of natural waters include the ions Na+, K+, Ca2+, Mg2+, H+, Cl-, HCO3-, CO32-, SO42- and gases O2, N2, CO2 and H2S. In small amounts such ions contain: Fe2+, Fe3+, Mn2+, Br-, I-, F-, BO2-, HPO42-, SO32-, HSO4-, S2O32-, HS-, HSiO3-, HSO3- and gases CH4, Ar, He, Rn.