MINTEQA2 calculation, results

The results from a MINTEQA2 calculation are read to an output file which can be viewed by a text editor. The format of this file can be pre-selected to vary the amount of detail given. Multiple output files can be created in which one of the inputs is systematically varied by selecting the use of the sweep option. 

Table 5.13 Results from a MINTEQA2 calculation for the chemical speciation of soluble complexes in two acidic stream waters...

TABLE 11.3. Results of a MINTEQA2 Calculation of the Chemical Speciation of Soluble Metal Complexes in Two Acidic Stream Waters as a Percentage of the Total Component... 

Table 7.10. Results of minteqa2 calculations of adsorption onto hydrous ferric iron oxide (HFO).

In the text we hand calculated the speciation of a solution containing 1.00 M HCl and 0.010 M Cd(NO,)2 at 25°C and zero ionic strength. Enter the same information into MINTEQA2 and let the program calculate the speciation. Compare your MINTEQA2 result to the result given in the book. Results may differ because of a different choice of Cd-Cl complexes and/or the use of different stability constants for the complexes in the computer model (listed in the file thermo.dbs). Tabulate and compare the two sets of stability constants and explain differences between the results. 

Input the raffinate analysis into MINTEQA2 and let the program speciate the water as a means of determining the bisuifate, Compare this result to bisulfate computed above, and discuss the difference. Now calculate using the bisulfate and H -ion concentrations computed by MINTEQA2. Remember, the acidity is a sum of equivalent concentrations, not activities. Assume the raffinate will be completely oxidized during its titration. 

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