General Assumptions and Attributes of Three Models

Westhall and H. Hohl, A comparison of electrostatic models for the oxide/solution interface, pp. 265-294, copyright 1980 with kind permission of Elsevier Science-NL, Sara Burgerhartstraat 25,1055 KV Amsterdam, The Netherlands. 

Some common assumptions inherent in the SC models include  

The sorbing surface is composed of specific functional groups that react with sorbing solutes to form surface complexes (inner sphere or true complexes, or ion pairs) in a manner analogous to the formation of aqueous complexes in the bulk solution. 

Surface complexation and ionization reactions can be described with mass-action equations, corrected for electrostatic effects using EDL theory. 

Surface charge ( j) and electrical potential (ip) are consequences of chemical reactions involving the surface functional groups. 

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