One of the limitations to using thermodynamic electromotive force (EMF)- or potential-pH diagrams is the inability to include organic ions and the products of their interaction with metals in the data base. Formation of such products may affect corrosion. This paper provides a method for deriving the free energies of formation of such species in the standard state of 1 molal (m) concentration, unit activity coefficient, 298 K. The methodology is used to derive the thermodynamic EMF-pH diagram for iron in the presence of iminodiacetic acid, a compound known to form dissolved complexes with iron.
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D. C. Silverman (1988) studied this question.
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