SURFACE DISSOCIATION-CONSTANTS FOR SOLID OXIDE AQUEOUS SOLUTION SYSTEMS

被引:19
作者
DRZYMALA, J
LEKKI, J
LASKOWSKI, J
机构
[1] Laboratory of Mineral Processing Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Wroclaw Technical University, Wrocław
关键词
D O I
10.1007/BF01474107
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An equation for the surface potential ψ0 was used to define the surface dissociation constant of surface hydroxyls at a solid oxide/aqueous solution interface. Using the measurements of the surface charge, the Gouy-Chapman theory and crystallo-chemical data for oxides, the calculations of the surface dissociation constants have been carried out. The values of the acidic surface dissociation constants (in minus logarithmic scale) fall in range 8.7±0.8 at ionic strength 1 M and in the range 7.2±0.7 at 10-3 M KNO3 These constants exceed by 2 to 5 orders of magnitude the dissociation constants of M(OH)naq species in solution. © 1979 Dr. Dietrich Steinkopff Verlag.
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页码:768 / 772
页数:5
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