Hi Brian,
I am new for GWB9. I am trying to construct pH-Eh diagram for arsenic, sulfur and Fe in a system containing 0.01333mM As, 3mM Fe and 3mM S. But in GWB, it requires activity rather than concentrations of each element. So, how can I get the correct activity in this system. Use some software to calculate them? I will greatly appreciate to your help if you can show me step by step.
Regards,
Shaofeng