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  • 2 weeks later...

There are a few ways you can look at speciation as a function of pH in GWB Student. The easiest and simplest is to set up an activity diagram for your system of interest using Act2. The diagram should include pH as one of the axes. Here are some examples and tutorials.


To determine the abundances of various species under a given condition (i.e. at a given pH) you can use the program SpecE8. In the GWB Standard Edition, the program React is useful to see how the distribution of species varies as a function of pH.


You should keep in mind that the species considered in a diagram or model will depend on the thermo dataset loaded by the programs. You can use TEdit to see which species are included in the various thermo datasets distributed with the GWB. The default thermo dataset, thermo.tdat, does not include any thiosulfate species, but thermo_minteq.tdat on the other hand does.

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