Sorption of HPO4 onto Goethite

[stacey13]

I would like to know how can I include the sorbing surface of goethite into a Eh-pH diagram to view the adsorption of this nutrient onto this mineral in a body of water. To develop the Eh-pH diagram I use Act2 however to acheive my objective I dont know if I can use React to view the adsorption in varying Eh and pH.

[Brian Farrell]

Hi,

Act2 and Tact draw traditional stability diagrams accounting for aqueous species, minerals, and gases, but not surface species. I recommend using React to trace adsorption of your nutrients as a function of pH. You can repeat the procedure assuming a few different Eh values to see its effect.

If you'd like, you can do a little post-processing work to assemble the results of each calculation into a single diagram. For some tips, take a look at the "How do I overlay my diagrams?" and "How do I retrieve numerical data from my plots" slideshows in the Using GWB section of our Tutorials webpage.

Hope this helps,

Brian Farrell

Aqueous Solutions LLC