ion concentration input

[cjuarez]

Hello,I've been using phreeqc for a couple of months now. I thought I was getting it all right, but a guy at work asked me, when one has a stiff analysis and you have all you major ions, how do you put them in the solution input?
For example, we had in the analysis 19325 mg/l of Na+ but for in the initial solution you can only chose Na. This is not Na+, so after running the simulation you get for Na what you entered  (0.8952 mol/kgw = 19325 mg/l) as a master species and a lower concentration for the ion species which does not match the original analysis.

I tried to specifiy in the solution Na as Na+ but there was no change.

Any other suggestions?

Thank you for your time :)

[dlparkhurst]

Unless you used a specific-ion Na+ electrode, your analysis is almost certainly the total concentration of Na in solution in whatever units it was reported. So, using Na in SOLUTION is correct.

[John Mahoney]

look at the setup for the solution_master_species in any one of the databases.  That links the names used to define a solution compositions with the appropriate component (OK, I am mixing terms here)  so Na is the name and Na+ is the component.