A sensitive procedure for the rapid electrochemical determination of Eosin-Y dye using voltammetric techniques onto a mercury electrode surface

A sensitive adsorptive stripping procedure (square wave adsorptive stripping voltammetry), was developed to study the adsorption property of Eosin-Y dye on a working electrode (HMDE) and its determination in selected samples. In addition, differential pulse polarographic and cyclic voltammetric methods were used to evaluate the electrochemical preliminary studies of Eosin-Y dye. By means of using the adsorptive stripping voltammetric method, a sensitive approach for the quantitative electro-analysis of this dye was achieved. A well-developed voltammetric peak probably related to the cathodic reduction of carbonyl group was obtained in pH (5) acetate buffer at -550 mV. An irreversibility nature of the reduction process was confirmed by use cyclic voltammetric technique. The adsorptive stripping current was evaluated with respect to various experimental conditions and the optimal values estimated at electrolyte (acetate buffer), pH (5), 30 s accumulation time, 0.0 V accumulation potential, 400 mVs -1 scan rate, 80 mV pulse amplitude and 60 Hz square wave frequency. Adsorptive stripping voltammetric peak showed a linear response for Eosin-Y in the concentration range from 5.010 -8 to 5.010 -7 mol L -1 (r = 0.99). A limit of detection of 8.7310 -10 mol L -1 (0.566 ppb) with 0.64 RSD% and average recovery of 107%±1.6 SD; were achieved. Possible interferences with several dyes such as food additive azo dyes (E110, E102) and amaranth, and some metals such as Cu +2 and Zn +2 were also examined. The developed electrochemical procedure was successfully used for the recovery of Eosin-Y dye in commercially available dirt remover and sea water.