NEW POSSIBILITIES OF POTENTIOMETRIC STRIPPING ANALYSIS BASED ON ION-PAIR FORMATION AND ACCUMULATION OF ANALYTE AT CARBON-PASTE ELECTRODES -PRELIMINARY NOTE

A novel technique of potentiometric stripping analysis is based on ext ractive accumulation of anionic species of Lipophilic character in pol ar pasting liquids of carbon paste electrodes. Determinations of both gold(III) which is accumulated as tetrachloroaurate(III) and iodide (a ccumulated at positive potentials as a halide complex of iodine) at a carbon paste electrode containing tricresyl phosphate are given as exa mples. Both the anions form ion-pairs with protonated tricresyl phosph ate and accumulate at the working electrode on extraction principles; the accumulation step is followed by their reduction using constant cu rrent. Similar procedures based on ion-pair formation followed by extr active accumulation could be elaborated fur many other ionic species. Thus, this may represent a new approach utilizable in potentiometric s tripping analysis.