Sorption Implementation in Computer Programs

Programs rxn and react in The Geochemist s Workbench can account for the sorption of aqueous species onto mineral surfaces by several methods, including the two layer surface complexation model of Dzombak and Morel (1990), the constant 

To show how these programs work, we consider a couple of examples from The Geochemist s Workbench User s Guide, then repeat them with phreeqc. Examples of more complex systems are considered in later chapters. 

The Geochemist s Workbench Consider a dilute solution containing several ions in contact with the adsorbing surfaces of hydrous ferric oxide (HFO). A script for program react is shown in Table 7.2. 

The Geochemist s Workbench stores the Dzombak and Morel data in a file called FeOH. dat. The program calculates the sorbing surface area and available sites from the mass of mineral (1 g) and data in FeOH. dat. 

TITLE Example from GWB User s Guide SURFACE 1 

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