不同温度下水溶液中树胶醛糖与HCl相互作用的体积性质

采用密度法研究了在278.15—318.15 K(间隔10 K)下树胶醛糖+HCl+水三元溶液的密度、树胶醛糖在盐酸(0.2—2.1087 mol/kg)中的表观摩尔体积VΦ,A、标准表观摩尔体积VΦ,A0和树胶醛糖与HCl的体积相互作用参数. 研究结果表明, 树胶醛糖在盐酸中的VΦ,A和VΦ,A0均随HCl浓度的增加而线性增大. 在一定温度下, 树胶醛糖从纯水到盐酸水溶液的标准转移表观摩尔体积均为正值, 且随盐酸浓度的增加而增大. 在所测温度范围内, 树胶醛糖在盐酸中的VΦ,A0随温度T的变化关系可表示为VΦ,A0=b0+b1(T-273.15)0.84. 树胶醛糖与HCl对体积相互作用参数VEN大于零, 但数值很小且对温度变化不甚敏感.

Volumetric Properties of the Interaction of Arabinose with HCl Aqueous Solution at Different Temperatures

The interactions of electrolytes with saccharides are very important not only in exploring the stability of polysaccharides in biological systems but also in the chemical industry of saccharides and in the treatment of waste water containing saccharides. In this work, the density data were measured for arabinose+HCl+water at 10 K intervals from 278.15 to 318.15 K. The apparent molar volumes(VΦ,A) and standard apparent molar volumes(VΦ,A0) for arabinose in hydrochloric acids(0.2—2.1087 mol/kg) were calculated. Volumetric interaction parameters of arabinose with HCl in water were also evaluated. The apparent molar volumes and standard apparent molar volumes for arabinose in aqueous HCl solutions increase lineally with increasing molality of HCl. At a given temperature, the standard transfer apparent molar volumes(ΔtVΦ,A0) of arabinose from water to aqueous HCl solutions are positive and increase with increasing molality of HCl. In the temperature range studied, the relationship between(VΦ,A0) for arabinose and temperature is as follows: VΦ,A0=b0+b1(T-273.15)0.84. Pair volumetric interaction parameters of arabinose with HCl in water(VEN)are more than zero and vary slightly with the change of temperatures.