肌醇在碱金属氯化物溶液中的体积性质

Volumetric Properties of myo-Inositol in Aqueous Alkali Metal Chloride Solutions

使用精密数字密度计测定了298.15和308.15K肌醇在不同浓度的LiCl-H2O、NaCl-H2O或KCl-H2O溶液中的密度,计算了肌醇的表观摩尔体积VΦ和极限偏摩尔体积VΦθ,得到了其由纯水溶剂转移至混合溶剂中的迁移偏摩尔体积ΔtrsVΦθ.结果表明,LiCl,NaCl和KCl在溶液中对肌醇的体积性质影响显著,极限偏摩尔体积VΦθ和极限迁移偏摩尔体积ΔtrsVΦθ都随盐浓度的增大而增加;温度对肌醇的极限偏摩尔体积和极限迁移偏摩尔体积只有轻微影响.从分子-离子间的相互作用角度对实验结果进行了讨论.

Apparent molar volumes （VΦ） of myo-inositol in aqueous solutions of LiCl, NaCl, and KCl were obtained from densities, measured with a vibrating-tube densimeter, at 298.15 and 308.15 K. These data have been used to deduce limiting partial molar volumes VθΦ and limiting partial molar volumes of transfer ΔtrsVθΦ from water to different salt solutions at different concentrations. The results indicated that influence of salt （LiCl, NaCl or KCl） on volumetric property of myo-inositol in aqueous solution was evident while temperature could only slightly change VθΦ and ΔtrsVθΦ. The result was discussed in the light of interaction between the charged centers of myo-inositol and ions.