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Re: thanks

> 1- The Program always give me Error,[ it is impossible to balance
with input uncertainties ] I used default uncertainties and tried to change


Look at the charge balance for your solutions, it is printed out at the top
of the distribution of species. Apparently, your solutions have > 10%
charge imbalance. Check that the analyses are defined correctly and try to
figure out what is the reason for the large imbalance. The uncertainty for
inverse modeling must be greater than half of the percent charge imbalance

> 2-  Why program calculate SI from initial solution . It is supposed to
calculate SI from final solution not from the initial [ as i have two
only one initial and the other final]

PHREEQC calculates a distribution of species and SI's for every solution
defined in SOLUTION data blocks. It is necessary to calculate the total
concentrations, charge balance, and alkalinity that is used in inverse


David Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

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