Arsenic and Copper sorption by Kaolinite

[Carlos Gallardo]

Hi everybody,
I'm new using PHREEQC and I'm trying to model the adsorption of arsenic and copper in kaolinite. I have found in other examples the adsorption of these components with ferryhidroxides, but for kaolinite I haven't found any information. Con you help me with this?
Thank you very much :)

[John Mahoney]

There is information out there, I googled Copper Surface complexation kaolinite and found what appears to be a detailed paper by Tracy Lund, and others in Geochemical Transactions, in   2008, this is open access.  there is another paper by C.L. Peacock and  David Sherman, 2005,  Surface complexation model for multisite adsorption of copper(II) onto kaolinite. in  GCA  3733-3745.  August 2005. 

Similarly googling arsenic surface complexation kaolinite gets some older papers by Bruce Manning, and Sabine Goldberg.  plus a few other things.
     

Now these papers all use different models so you might have to refit the data to your preferred model.
Once again I will suggest PhreePlot, to do fitting with PHREEQC models. 

[Carlos Gallardo]

Thank you John! I'll check those papers ;)