Frank Bok Posted May 24, 2017 Share Posted May 24, 2017 Hello! I try to model the alteration of Ferrihydrite to Goethite (including it's effect on sorption). I have suppressed all Fe minerals beside Fe(OH)3(ppd) and Goethite. Since Goethite has a much lower solubility, GWB uses Goethite as stable mineral phase and instantantiosly forms Goethite from all the Fe(OH)3(ppd) I give into the system. My only idea is to remove all the Fe(OH)3(ppd) first from the system and then add the same molar amount of Goethite. But this is somehow inelegant. I also found some kinetic data on the Ferrihydrite-to-Goethite alteration, that I would like to use (http://pubs.acs.org/doi/pdf/10.1021/ie010931z). My question is: Is there a way to handle two mineral phases with the same basis species / redox species (in this case Fe+++) in coexistence? Thank you in advance! Frank Quote Link to comment Share on other sites More sharing options...
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