The apparent molar volumes (VΦ) of L-lysine monohydrochloride, L-histidine, and L-arginine in water and in aqueous of sodium acetate, potassium acetate, and calcium acetate solutions have been determined at temperatures from (303.15 to 323.15) K from density measurements. The partial molar volumes at infinite dilution (Vo 2) obtained from VΦ data have been used to calculate the transfer volume (ΔVtr) of amino acids in water and in the presence