title: A simple system for the measurement of ion activities with solvent polymeric membrane electrodes.
mesh_terms: D002118:Calcium / Q000032:analysis*; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D008567:Membranes, Artificial; D010100:Oxygen / Q000032:analysis; D011188:Potassium / Q000032:analysis*; D012997:Solvents
chemical_list: D008567:Membranes, Artificial; D012997:Solvents; D011188:Potassium; D010100:Oxygen; D002118:Calcium