Complex Formation in the Iron(II)-Iron(III)-Iminodisuccinic Acid System as Probed by Potentiometry

摘要

Complex formation in iron(II)-iron(III)-iminodisuccinic acid (H_4L) aqueous solutions was studied by pH and redox potentiometry at 25 deg C and an ionic strength 0.1 (KCl). Various neutral, protonated, and hydroxo complexes of iron(III) are formed depending on the H_4L concentration and solution pH. Formation constants were calculated for all of the complexes discovered. The percentage distribution diagrams of the complexes are mapped as a function of solution pH.