inverse modelling with silicate weathering

[vivek vasudev]

For my study ,silicate weathering is only shows the correlation when plotting ratio graph (Ca+Mg vs HCO3) so i trying to do inverse modelling with solutions of high EC  value (9000) and low EC value (700) .And lithology is granite and peninsular gneiss.My doubt is that , which solution will put as 1st solution (high EC/Low EC) and which phases can i uses to do inverse modelling ?
Plz reply for this one........

[dlparkhurst]

Low EC would be first.

Look at the inverse modeling examples in the manual (ex 16, 17, 18), and NETPATH manual.