Organizations: Environmental Isotopes Variables: dissolved_organic_carbon alkalinity total_cell_concentration hydraulic_conductivity concentration oxygen_saturation Keywords: groundwater Substances: Nitrogen (InChI=1S/N2/c1-2) Argon (InChI=1S/Ar) Krypton (InChI=1S/Kr) Nitrate (InChI=1S/NO3/c2-1(3)4/q-1)