Hi Brian,
thank you very much for your quick response. To the description of the system, it is correct that the medium was fed as dissolved salts, the soil elemental composition is based on XRF bulk values. We only know minerology for the As phase (xafs), not for any other phase (Fe, Mn). The soil was aerobic, probably it would make sense to swap Fe/Mn diss. to Fe/Mn solid phases characteristic for such soils. The intial soil Na, K, Cl, Mg, Ca, PO4 etc. I realize now, I should have included as well. However, again I do not as which phase they are present, should I add the concentration to the dissolved content or make an assumption on probable solid phases?
Regarding the configuration -> iteration setting, I can see how this works for the calculation. Still, I do not really understand what the convergence criterion "epsilon" stands for and what are typical values that make sense. I need to set it to 10^-8 instead of 10^-11 to have all steps calculated, is that ok? I would very much appreciate some help here.
I realized somethind strange when I started playing with the plots. H2O in fluid increased considerately from ~ -100 mV onwards. Could you comment on this please?
Thanks again for your help,
Best regards
Markus