What does it means if the output gives you no phase transfers as the minimum model to account for changes in water quality between two solutions?
It means the two solutions are essentially the same composition within the given uncertainty limits and no reactions are needed to account for the differences. However, if the uncertainty limit were 1.0 for each constituent of each solution, that is 100 percent uncertainty, then any two solutions would be essentially the same. If uncertainties are small, say less than .05, then it means concentrations between the two solutions differ by less than 5 percent. The key is whether you have used uncertainty limits that are reasonable, if you have, then the solutions are not significantly different. • INVERSE_MODELING: Is there any way that I might form an output file which lists only the sum of residuals and maximum fractional error for each test run? There is no way with version 1 of PHREEQC to write inverse-modeling information to another file. The beta test version 2.0 has the capability to write the mole transfers to a selected-output file. I’ll have to add the maximum fractional error a
