Fernando Posted August 12 Share Posted August 12 Hello, I am new to this forum and have a rather basic question. I am modelling in SpecE8 soil solution in the presence of a cation exchanger (to model the soil CEC). I have data for the total exchangeable Ca, Mg, K and Na; however when I set up the "constraints in initial system" in Basis, it looks as the data expected by SpecE8 is total dissolved, not total in system (solved plus bound to exchanger). Am I correct? How can I solve this question? Best regards Fernando Quote Link to comment Share on other sites More sharing options...
Brian Farrell Posted August 12 Share Posted August 12 Hi Fernando, What you describe is the default setting for applying basis constraints to chemical systems involving surfaces. I think you want to use the “sorbate include” option instead. It is briefly described in section 7.7.1, Surface complexation, of the GWB Essentials Guide, although it applies as well to the ion exchange and sorption isotherm models. Please see as well the “sorbate” command in the SpecE8 chapter of the GWB Command Reference. Hope this helps, Brian Farrell Aqueous Solutions Quote Link to comment Share on other sites More sharing options...
Fernando Posted August 12 Author Share Posted August 12 Thank you! I will try this Quote Link to comment Share on other sites More sharing options...
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