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Voltammetric determination of trace amounts of permanganate at a zeolite modified carbon paste electrode

Abstract

A novel sensitive, simple and fast method was suggested for indirect voltammetric determination of permanganate in aqueous solution. The method is based on the modification of carbon paste electrode (CPE) by Fe(II)-exchanged clinoptilolite nanoparticles (Fe(II)-NClin). When permanganate was added to H2SO4 supporting electrolyte, voltammetric peak current of Fe(II)/Fe(III) redox system was decreased. Hence, this decrease in the peak current was used for indirect determination of permanganate. The results of electrochemical impedance spectroscopy (EIS) confirmed that the modified Fe(II)-NClin/CPE electrode has remarkable charge transfer ability with respect to the raw CPE and NClin/CPE electrodes. The interaction effects of more influencing variables in square wave voltammetry were studied by experimental design method using response surface methodology (RSM). The optimal run obtained as: pH 2.0, amplitude = 0.5 V, modifier% = 16.5 and step potential = 0.023 V. Under optimum conditions, the square wave voltammetric current of Fe(II)-NClin/CPE was inversely proportional to permanganate in the concentration range from 35 to 80 nmol L-1 with a detection limit of 0.40 nmol L-1.

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Publication details

The article was received on 18 Aug 2017, accepted on 25 Oct 2017 and first published on 25 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ03076B
Citation: New J. Chem., 2017, Accepted Manuscript
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    Voltammetric determination of trace amounts of permanganate at a zeolite modified carbon paste electrode

    A. Nezamzadeh-Ejhieh and M. Nosuhi, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03076B

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