The saturated calomel electrode is the reference electrode in aqueous polarographic studies. Such is not the case, however, with nonaqueous polarographic studies. In particular acetonitrile has been used as the solvent for many polarographic studies with just as many reference electrodes. An attempt has been made to correct this unfortunate situation. Appropriate measurements have been made to evaluate the potential of the various reference electrode systems used in acetonitrile with respect to the aqueous saturated calomel electrode.