The redox potentials of M(n+)/M (M(n+) = Cu2+, Pb2+, Sn2+, Cd2+, Ag+, Zn2+, Hg2+), M(n+)/M ((n-m)+) (Fe3+/Fe2+, Fe(CN)(6)3(-)/Fe(CN)(6)(4-)), and AgX/Ag, X(-) (X = Cl, Br, and I) have been measured in aqueous solutions of ammonium nitrate (1-14 M). The variation of salvation of ions, characterized by the solvent transfer coefficient f(tr), is calculated from the normal redox potentials of the systems. For all the cases, the potential of the ferricinium/ferrocene system (Fc(+)/Fc) is used as a reference of potential. It appears as a general trend that when the concentration of salt increases from 1 to 14 M, the potentials of the systems vary slightly, indicating weak interactions between these solutes and the salt. The examined ions can be classified into two groups : those that are less solvated as the concentration of NH4NO3 increases (Cu2+, Cd2+, Zn2+, Cl-, Br-, I-) and those that are more solvated, (Pb2+, Ag+, Hg2+, Sn2+). The solubility constants of the AgX salts in the H2O + NH4NO3 mixtures are also calculated.