高等学校化学学报

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (10): 1934.

• 研究简报 • 上一篇    下一篇

298.15K下Li2B4O7-H2O体系水蒸汽分压及渗透系数的等压测定和离子相互作用模型

张爱云1,2, 姚燕1, 宋彭生1   

  1. 1. 中国科学院青海盐湖研究所, 西宁810008;
    2. 黑龙江科技学院, 哈尔滨160000
  • 收稿日期:2003-06-16 出版日期:2004-10-24 发布日期:2004-10-24
  • 基金资助:

    国家自然科学基金(批准号:29871034)资助

Isopiestic Determination of Vapor Pressures and Osmotic Coefficients and the Ion-interaction Model for Li2B4O7-H2O System at 298.15 K

ZHANG Ai-Yun1,2, YAO Yan1, SONG Peng-Sheng1   

  1. 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
    2. Heilongjiang Institute of Science and Technology, Haerbin 160000, China
  • Received:2003-06-16 Online:2004-10-24 Published:2004-10-24

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关键词: Li2B4O7-H2O体系, 等压法, 渗透系数, 饱和蒸汽压, 离子相互作用模型

Abstract: Isopiestic molalities, vapor pressures and osmotic coefficients of aqueous Li2B4O7 solutions from 0.027 5 to 2.939 7 mol/kg were determined at 298.15 K by using an improved apparatus. The rule of the changes in vapor pressure over aqueous Li2B4O7 solutions was revealed, which indicated that the bond of borate anions with water are better than that of NaCl. The different formation reaction equilibria for the species containing boron of boric acid and borate anions B(OH)4-, B3O3(OH)4- and B4O5(OH)42- in Li2B4O7(aq) solutions were taken into account. The stoichiometric equilibrium constants for the formation reactions of the boron species and the ion-interaction parameters were estimated simultaneously by using Pitzer equations of osmotic coefficient with minor modifications. Sixteen parameters were obtained with a standard deviation 0.005 5 for the ion-interaction model.

Key words: Li2B4O7-H2O system, Isopiestic method, Osmotic coefficients, Saturated vapor pressure, Ion-interaction model

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