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Dear Prof. Dr. David Parkhurst

U.S. Geological Survey, Denver, Colorado.


Once more I ask your kind help to understand the comprehensive PHREEQC-2.7 program. Let me tell you first that I am not well familiar with your modern higher kinetics, but I promise to follow your instructions. I noticed the following points:


1)      When I entered the seawater chemical analysis of NORDSTROM into the PHREEQC-2.7, the obtained results – ex. Saturation indices - were different from those described in the pdf-Example-1 (without U).

2)      When I checked the molal concentration of the mineral species, it was found that the minor Fe, Mn & Si minerals are given in higher amounts. I don’t know, may my simple calculations are wrong.

3)      I tried to correlate the obtained PHREEQC-2.7 data with the classical simplified “Probable Salt Combination Model” but the difference still very big. Attached herewith my calculation sheet.


I am sure that you are so busy, and not expect an early reply.


Best regards,

Samir El-Manharawy      

Description: application/msexcel

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