Adsorptive Stripping Voltammetric Determination of Cobalt in the Presence of Nickel and Zinc Using Pyrogallol Red as Chelating Agent

Tin-bismuth alloy electrode (SnBiE) was used for trace cobalt determination for the first time. Compared to the bismuth bulk electrode, the SnBiE possesses the advantages of higher hydrogen overpotential, easier manufacture, and lower cost. In addition, there is no need for a pretreatment (in terms of modification) of the electrode before measurements. The analysis of Co(II) was made by the adsorptive accumulation of the cobalt-nioxime complex from solution containing 60 μM nioxime and 0.1 M ammonia at pH 9.4 and followed by the reduction of the accumulated complex. The electroanalysis results show that the optimal sensitivity can be obtained by using nitrite as the auxiliary reagent. The calibration plot for Co(II) quantification was linear from 0.2 to 20 nM with a correlation coefficient of 0.998. Meanwhile, a detection limit of 44 pM was obtained in connection with an accumulation time of 60 s, which is more sensitive than that of the mercury, bismuth, lead, and lead-copper electrodes. The practical applications of SnBiE have been performed for the determination of Co(II) in real water samples, and the results are consistent with those results by use of inductively coupled plasma-mass spectrometry (ICP-MS).

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Voltammetric determination of metal ions beyond mercury electrodes. A review

Ariño

Serrano

Dı́az-Cruz

et al. 2017

Analytica Chimica Acta

149

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For a long time mercury electrodes have been the main choice for the analysis of metal ions and some metalloids. However, in the last years, safety and environmental considerations have restricted their use and encouraged the search for alternative materials more environmentally friendly and with more possibilities for in-situ and flow analysis. This research has been reinforced by the popularisation of nanomaterials, biomolecules and screen-printed electrodes, as well as for the new advances in sensor miniaturization and integration of the electrodes in multi-sensor platforms and electronic tongues. The present review critically summarizes and discusses the progress made since 2010 in the development and application of new electrodes for the analysis of metals and metalloids.

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Adsorptive Stripping Voltammetric Determination of Cobalt in the Presence of Nickel and Zinc Using Pyrogallol Red as Chelating Agent

Cited by 10 publications

References 17 publications

Colorimetric chemosensor for Zn2+ based on pyrogallol red and poly(diallyldimethylammonium chloride) in aqueous solution

Colorimetric chemosensor for Zn2+ based on pyrogallol red and poly(diallyldimethylammonium chloride) in aqueous solution

Rapid and sensitive determination of cobalt by adsorptive cathodic stripping voltammetry using tin–bismuth alloy electrode

Voltammetric determination of metal ions beyond mercury electrodes. A review

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