Polarographic and voltammetric investigations of new catalytic systems of iron for application in trace analysis.
New catalytic systems consisting of complexes of Fe(III)-ions with ligands such as nitrilotriacetic acid, N-(2-hydroxyethyl)iminodiacetic acid, N,N-bis(2-hydroxyethyl)glycine, triisopropanolamine, 2-hydroxy-1,3-diaminopropanetetraacetic acid, tris-(hydroxymethyl)aminomethane, bis-(2-hydroxymethyl) iminotris-(hydroxymethyl)methane, 1,3-bis/tris(hydroxymethyl)methylamino/propane in ammonia buffer and 1,2-dihydroxybenzene in tris-(hydroxymethyl) amino-methane-HCl buffer and ClO(-)(2)-ions as the oxidizing agent were studied by pulse polarography and voltammetry. Optimal conditions such as kind and concentration of the ligand, the composition of supporting electrolyte and concentration of NaClO(2) for the determination of traces of iron in the presence of a large excess of other electrochemically active ions were examined. Examples of acceleration and inhibition of catalytic reactions between Fe(II). L and ClO(-)(2)-ions by electrochemically inactive ions have been found.
Zarecedil;bski
Jerzy
J
University of Mining and Metallurgy, Cracow, Poland.