webmaster Posted December 27, 2004 Share Posted December 27, 2004 From: "Brugger, Joel (SAM)" Subject: Speciate different components over x-y I'm trying to calculate a log f O2(g) vs pH diagram to show relationships between Fe-Ni sulfides. I therefore speciate SO4-- and Fe++ over x-y and make the diagram for Ni++. I get a nice diagram, but something disturbs me. The dashed boundaries correspond to the overlap of the boundaries for the pure Fe-O-H and S-O-H systems. It seems more appropiate that the boundaries for Fe should take into account Fe sulfides (e.g. pyrite), i.e. the Fe should be speciated in the Fe-S-O-H system. So my question is: is there any way to tell GWB to speciate S in the S-O-H system, and then Fe in the Fe-S-O-H system, and then to calculate the nickel speciate over these two diagrams? From: Craig Bethke Subject: Re: Speciate different components over x-y I think you'll find that the scheme you propose is not internally consistent and will not result in a unique solution. To convince yourself, try drawing such a diagram by hand. I think you will find that you end up with more than one way to balance the reactions among the Ni species. Quote Link to comment Share on other sites More sharing options...
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