Potentiometric Stripping Analysis At The Gel Stabilized Oilwater Interface

The application of potentiometric stripping analysis for therndetermination of anions at gel stabi 1 i zed water /ni trobenzenerninterface has been studied. A four electrode potentio-galvanostatrnwith differentiator circuit used to carry out the experiment wasrnconstructed in our laboratory.rnThe performance of the gel stabilized nitrobenzene/waterrninterface was preliminary tested using cyclic voltammetry, phasernselective AC voltammetry, differential pulse voltammetry andrndifferential pulse stripping voltammetry. The ions studiedrninclude ClO.- and N03-. The ion transfer across the gel/waterrninterface was found to be diffusion controlled under thernexperimental conditions. The half wave potential differencernbetween two ions calculated was in good agreement with literaturerndata.rnThe influence of deposition time, current density and restrnperiod on the transition time, f, of the stripping step wasrninvestigated. stripping times obtained in derivative mode werernfound to be significantly longer than those obtained in thernnormal mode (based on 99.9% confidence level). The simultaneousrndetermination of ClO.- and N03 - is possible by PSA and DPSA:

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