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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 7    No. 1    March 1997

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THERMODYNAMIC ANALYSES FOR S-H2O SYSTEM AT 25℃
Yi Qingfeng; Chen Qiyuan; Zhang Hengzhong; Zhang Pingmin

Dept. of Chemistry; Central South University of Technology; Changsha 410083

Abstract:A new type of potential pH diagram and distribution curves X(i) pH of aqueous species for the S-H 2O system have been reported and discussed according to overall equilibrium principle. The stable region of elemental sulfur is dependent on total sulfur concentration C t(S) of all species in solution and partial pressure p H 2S / p 0 of H 2S gas. When p H 2S / p 0 =10 -6 and C t(S)=1 mol/L, the stable range of sulfur disappears. Dominant region of S 2- 5 ion in the solution corresponds to stable region of solid sulfur in E h pH diagram. This type of E h pH diagrams and distribution curves of aqueous species are of both theoretical and practical importance.

 

Key words: potential pH diagram thermodynamics S-H 2O system sulfur

ISSN 1672-7029
CN 43-1423/U

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