Calc.  SED & PREDOM / Input data-file format / Names and Numbers

Removing species: If the first character in the name for a chemical species is an asterisk (*), the species will not be included in the calculations. This is a quick method to deactivate a species without having to remove it from the input data file.

It is convenient to deactivate species using SPANA.

Note that if you deactivate a component in this way, then only the free component is removed from the mass balance. For example, if the components are H+ and AlOOH(cr) and you deactivate the Al oxyhydroxide by changing its name to *AlOOH(cr), then you suppress the precipitation of that solid in the calculations, but aluminium is not removed: the Al-complexes AlOH2+, Al(OH)3(cr), etc, still remain. Example.

Note that some species (H2O, e and gases) always have zero concentration and therefore, for them it is not necessary to add a “*” as the first character.