lvsoar Posted October 6, 2009 Share Posted October 6, 2009 Hi, I have 3 basic questions about ACT2: (1) If I want to plot a ACT-ACT diagram on Cu, is that true that for the diagram species I can only input total activity instead of molality? I see that it only gives me the choice of activity or log activity. (2) If I input the total activity of 10^-3 for Cu, is the 10^-3 including both the dissolved and solid phases? (3) How is the boundary between aqueous species and solid phases defined in ACT2? Garrels and Christ, defined the boundary as the point where the “sum of the activities of the ions in equilibrium with the solid exceeds some chosen value”. They chose 10^-6 as a default value on the basis that if it is less than this value, the solid will tend to behave as an immobile constituent in the environment. My question is whether the boundary is defined following Garrels and Christ (boundary at total dissolved Cu to be 10^-6) or to be the line where mineral precipitation begins? Thanks, Peng Link to comment Share on other sites More sharing options...
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