INFLUENCE OF INORGANIC ANIONS ON THE SPECIATION OF MONONUCLEAR AND POLYNUCLEAR ALUMINUM BY FERRON

The kinetic reactions of ferron (8-hydroxy-7-iodo-5-quinoline-sulfonic acid) with unneutralized and partially neutralized Al solutions in the presence of various organic anions were investigated with the intent of distinguishing mononuclear and polynuclear Al. Mononuclear Al solutions containing malate, glutarate, succinate, salicylate, formate, malonate, and fulvate with ligand/Al molar ratios ranging from 0. 4 to 7. 5, reacted rapidly with ferron and were modeled using a single second-order equation. The interaction of ferron with Al-polymers was not significantly affected by concentrations of organic anions whose ligand/Al molar ratio did not exceed these critical values. These conditions allowed the accurate distinction of mononuclear and polynuclear Al.