Dave- I need to use as PHREEQC input some output from another geochemical code. The problem is that I can only use concentrations that are given in terms of a few individual aqueous species, i.e., Ca++ instead of Ca total or SO4-- instead of S. Is there a simple way to use that kind of data as an input apart from picking some larger number for total Ca... and iterate until Ca++..... concentrations in PHREEQC output matches my input? Thanks JP
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