Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (02): 333-337.doi: 10.3866/PKU.WHXB20080226

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Phase Equilibrium of Quaternary Reciprocal System Cd2+, Na+//Cl-, SO42--H2O at 298 K

HUANG Yi; NI Shi-Jun; SANG Shi-Hua; WANG Pei-Dong   

  1. Department of Geochemistry, Chengdu University of Technology, Chengdu 610059, P. R. China
  • Received:2007-07-31 Revised:2007-10-29 Published:2008-01-26
  • Contact: HUANG Yi

Abstract: Phase equilibrium of quaternary system Cd2+, Na+//Cl-, SO2-4-H2O at 298 K was studied by isothermal method. The study showed that the quaternary system bearing Cd included Na2CdCl4·3H2O phase field, seven univariant curves, three co-saturation points and five crystal phase fields. The crystal fields of equilibrium solid phases were Na2SO4, CdSO4, CdCl2·2.5H2O, Na2CdCl4·3H2O and NaCl, respectively. The physico-chemical properties of solution in the quaternary system indicated regular change along with the increase of Cd2+ concentration. The results indicated that Cd salts possess quite high solubilities in the system studied, which means a strong transfer of Cd2+ and a high pollution risk of soil environment.

Key words: Cadmium, Quaternary reciprocal system, Isothermal method, Phase equilibrium