Borek, AWK; also chenbeier and Mitch:
Thank you very much for help with your responses.
I am not a chemist, (unfortunately), but I am required to reproduce an experiment that requires a chemical formulation.
My interest is in the effect of iron and copper salts on an exposed organic surface, and these observations are in my field of expertise.
However, the presented chemical formulation was unclear to me since it stated that an aqueous solution or a gel (which would be much easier to apply) are required, and that pH which allowed iron and copper to remain stable in the desired form would be from 8,5-10,5. Also, the formulation stated ferrous ion as an active component and given the basic environment, I could not make sense of it since ferric iron would appear very soon, and the observations were to be performed for 12 hours.
I am now wondering about potential pH modifiers.
Once again, thanks.