Organizations: Environmental Isotopes Variables: dissolved_organic_carbon total_cell_concentration Keywords: noble gases groundwater riparian zone Substances: Sulfate (InChI=1S/H2O4S/c1-5(2,3)4/h(H2,1,2,3,4)/p-2 Oxygen (InChI=1S/O2/c1-2) Argon (InChI=1S/Ar)