6533b7d3fe1ef96bd125ff04

RESEARCH PRODUCT

A study on the adsorption voltammetry of titanium with various heterocyclic azo-compounds

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description

The voltammetric behaviour of various heterocyclic azo-compounds and their Ti-complexes was investigated at a stationary Hg electrode. In moderately acidic solutions Ti(IV) reacts with pyridylazo-compounds (PAR, 5-Br-PADAP, PAN), thiazolylazo-compounds (TAR, 5-Me-TAR, TAN, 4-Me-TAP) and pyrazolylazo-compounds (MDR, ERB) to form Ti-complexes, which are strongly adsorbed onto the Hg-electrode. These complexes are reduced at potentials more negative than those corresponding to the reduction of their respective ligands. The conditions for determining titanium by adsorption voltammetry using TAR and MDR as complexing agents were investigated in detail, as was the influence of foreign ions on the determination. For TAR a detection limit of 0.15 ng/g Ti was found, for MDR the same was 0.12 ng/g. Trace amounts of titanium in bological samples were also determined using PAR, 5-Br-PADAP, TAR and MDR as complexing agents. The results agreed satisfactorily with those obtained by ICP.