Standard Gibbs energies of ion transfer from water to 1,2-dichloroethane have been evaluated from voltammetric measurements at the interface between two immiscible electrolyte solutions for a series of univalent ions (in kJ mol-1): H+ (53), Li+ (57), Na+ (57), Cl- (51), Br- (43), and I- (33). Thermodynamic scales derived from solubility, partition or electrochemical measurements have been compared and found mutually consistent, except for highly hydrated cations, in which case the electrochemical scale is superior. The stability constants of crown ether complexes of alkali metal cations in 1,2-dichloroethane have been revised.