物理化学学报 >> 2003, Vol. 19 >> Issue (03): 230-232.doi: 10.3866/PKU.WHXB20030309

研究论文 上一篇    下一篇

In(Ⅲ)的标准迁移吉布斯自由能

董文举;冯九菊;王键吉   

  1. 河南师范大学化学与环境科学学院,河南省高等学校环境科学与工程重点学科开放实验室,新乡 453002
  • 收稿日期:2002-05-27 修回日期:2002-09-06 发布日期:2003-03-15
  • 通讯作者: 董文举 E-mail:dwj7831@sohu.com

Standard Gibbs Energies of Transfer of In(Ⅲ) Ion

Dong Wen-Ju;Feng Jiu-Ju;Wang Jian-Ji   

  1. School of Chemical and Environmental Sciences, Key Laboratory of Environmental Science and Engineering of Henan Education Commission, Henan Normal University, Xinxiang 453002
  • Received:2002-05-27 Revised:2002-09-06 Published:2003-03-15
  • Contact: Dong Wen-Ju E-mail:dwj7831@sohu.com

摘要: 通过直流极谱法对In(Ⅲ) 从纯水到蔗糖及葡萄糖水溶液的标准迁移吉布斯自由能(GtΘ)进行了研究,根据In(Ⅲ)的可逆半波电位和扩散系数求得GtΘ.实验表明, GtΘ随蔗糖及葡萄糖浓度的增加而逐渐减小,说明In(Ⅲ)在蔗糖及葡萄糖水溶液中的稳定性增加. GtΘ可分为静电能和化学能两部分,化学能逐渐降低表明蔗糖及葡萄糖水溶液比纯水碱性强.根据三元体系中溶质-溶剂和溶质-溶质的相互作用对实验结果进行了讨论.

关键词: 普通直流极谱法, 离子迁移, 标准迁移吉布斯自由能, In(Ⅲ)离子

Abstract: Standard Gibbs energies of transfer, GtΘ, of In(Ⅲ) from water to aqueous sucrose and aqueous glucose solutions(mass fraction of sucrose and glucose w=0, 0.10, 0.20, 0.30, 0.40 and 0.50) have been determined by polarography at (298±1) K. In aqueous sucrose and glucose solutions containing 5.0×10-2 mol•L-1 LiClO4, the reversible half-wave potential and the diffusion coefficients for In(Ⅲ) have been determined respectively. Values of GtΘ, obtained from the reversible half-wave potentials vs the ferrocene electrode scale, are negative and decrease with increasing concentration of sucrose and glucose, indicating increasing stability of In(Ⅲ) in sucrose-water and glucose-water solutions. The GtΘ values were split into electrostatic and chemical contributions. The decreased chemical contribution shows that the mixtures are more basic than pure water. The experimental results are discussed in terms of solute-solvent and solute-solute interactions in the ternary systems.

Key words: Polarography, Transfer of ion, Standard Gibbs energies of transfer, In(Ⅲ) ion