Dear Sir/Madam, I would be very grateful if you could assist me in this query. I am using Phreeqc to calculate calcite saturation indices for my PhD. However, my manual calculations are coming out different to the Phreeqc results. As a test I used data from a hydrogeology textbook (Fetter(2001) applied hydrogeology, p360-1) which calculates calcite saturation manually. The textbook gives a saturation index of 0.05 while Phreeqc gives a saturation index of -0.02. Can you tell me if this difference is significant and if so where I might be going wrong? I would welcome any suggestions. Best regards, Garrett Kilroy PhD Candidate Department of Geology/ Centre for the Environment Trinity College Dublin 2 Ireland Tel: +353 1 608 2403 Fax: +353 1 671 8047
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