ALTERNATING-CURRENT INVESTIGATIONS AT THE MERCURY DROP ELECTRODE ON THE ADSORPTION POTENTIAL OF METAL-COMPLEXES

In adsorptive stripping voltammetry (AdSV) the analyte is accumulated on the electrode surface in the form of a metal complex and the determ ination step is carried out voltammetrically. Usually the technique is sensitive to the effects of other absorbable organic substances. Alte rnating-current (AC) investigations on the complexes of uranium, vanad ium and antimony with chloranilic acid, uranium with cupferron and cob alt and nickel with dimethylglyoxime gave information about their adso rption behavior on the electrode surface. Furthermore the AC voltammet ric behavior of the nonionic surfactant Triton X-100 was shown. By kno wing the adsorption potential and range of adsorption, predictions abo ut the effects of organic adsorbates can be made. Importantly the opti mal accumulation potential of the complex for its AdSV-determination m ay be obtained. With appropriate potential control the selective accum ulation of the analyte complex can be achieved and so avoid the influe nce of these other adsorbates in favorable cases.