Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (11): 2499-2504.doi: 10.3866/PKU.WHXB20111102

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

Energy Characterization of Effect for Ions on the Structure of Water

HE Jin-Song1,2, YANG Hong-Wei2, GAN Xiao-Ling1, CAI Ran2, ZHU Song-Ming1, YU Yong1, LI Jian-Ping1, MU Tai-Hua3, ZHU Wan-Peng2   

  1. 1. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, P. R. China;
    2. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, P. R. China;
    3. Institute of Agro-Food Science & Technology, Chinese Academy of Agricultural Sciences, Beijing 100094, P. R. China
  • Received:2011-06-01 Revised:2011-07-15 Published:2011-10-27
  • Contact: ZHU Song-Ming, MU Tai-Hua E-mail:zhusm@zju.edu.cn; mutaihua@126.com
  • Supported by:

    The project was supported by the Key Scientific and Technological Innovation Team Project of Zhejiang Province, China (2009R50001) and Department of Education of Zhejiang Province, China (Y201018520).

Abstract: At a concentration of 0-1.0 mol·L-1 the effect of salts (KCl, MgCl2, and CaCl2) on the structure of water was studied from the viewpoint of energy change using differential scanning calorimetry (DSC) and the results were compared with that obtained by the analysis of the chemical shift obtained by 17O-NMR (δ(17OH2)). A linear increase in the δ(17OH2) of water and a linear decrease in the apparent activation energy (-E'/R) of water with an increase in the concentration of salt was obtained. In addition, the rate of change of δ(17OH2) and -E'/R increased as follows: KCl22. Based on a two-state model, we demonstrate that the change in δ(17OH2) of water (Δδ) is proportional to the change in molar energy of water (ΔE). These results indicate that KCl, MgCl2, and CaCl2 promote the formation of the water cluster structure and the energy change of water is equivalent to the chemical shift obtained by 17ONMR for the characterization of the water cluster structure.

Key words: Salt, Water, Cluster structure, Hydrogen bond, Energy characterization

MSC2000: 

  • O645