【Abstract】 Enthalpies of solution of L-alanine in water and aqueous solutions of LiNO₃,NaNO₃,KNO₃,（NaClO₄） and Na₂SO₄ were determined at T=298.15 K by a RD496-Ⅱ microcalorimeter.The transfer enthalpies(ΔH_tr) of L-alanine from water to aqueous solutions of salts were derived and discussed in terms of the（electrostatic） interaction and the structural interaction.ΔH_tr decreases overall with increasing the concentration of（LiNO₃）,NaNO₃,KNO₃ and NaClO₄ but increases with increasing the concentration of Na₂SO₄.The results show that in LiNO₃,NaClO₄ and Na₂SO₄ solutions the structural interaction is responsible for the trends of ΔH_tr,while in NaNO₃ and KNO₃ solutions the effect of electrostatic interaction is predominant. The ion with larger size can make a larger destructive effect on the hydration structure of L-alanine. Anion has more obvious influence on the magnitude of the transfer enthalpy than cation.更多还原