Hi Dave, I ran this file through PHREEQC to get a CO2 number. I wanted to plot the water on a Phase diagram which uses pCO2 , to find out if We are in the calcite or the dolomite field. at 25 deg the file was not converging, then I realized that the field temperature was 15 degs C. It runs at 15 and at every temperature up to and including 20. At 21 degrees it no longer converges. I thought this was curious. I am wondering if increasing the allowable iterations will allow convergence. Or do I recalculate the phase diagram for 15 deg C? The sample is from groundwater in a slag fill deposit in Indiana. Jorie (See attached file: slag.in)
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