Applications of adsorptive stripping voltammetry in the determination of trace and ultratrace metals

A study on the simultaneous determination of Ni(II) and Co(II) dimethylglyoximates (Ni-DMG and Co-DMG) through adsorptive cathodic stripping voltammetry at an in situ bismuth-modified gold electrode (Bi-AuE) is reported. The key operational parameters, such as Bi(III) concentration, accumulation potential and accumulation time were optimized and the morphology of the Bi-microcrystals deposited on the Au-electrode was studied. The BiAuE allowed convenient analysis of trace concentrations of solely Ni(II) or of Ni(II) and Co(II) together, with cathodic stripping voltammograms characterized by well-separated stripping peaks. The calculated limit of detection (LOD) was 40 ng L À1 for Ni(II) alone, whereas the LOD was 98 ng L À1 for Ni(II) and 58 ng L À1 for Co(II), when both metal ions were measured together. The optimized method was finally applied to the analysis of certified spring water (NIST1640a) and of natural water sampled in the Lagoon of Venice. The results obtained with the BiAuE were in satisfactory agreement with the certified values and with those provided by complementary techniques, i.e., ICP-OES and ICP-MS.

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“…The working electrode was a conventional Au-disc electrode embedded in Teflon with a geometric area of 0.07 cm 2 …”

Section: Reagents and Materialsmentioning

confidence: 99%

Simultaneous Adsorptive Cathodic Stripping Voltammetric Determination of Nickel(II) and Cobalt(II) at an In Situ Bismuth‐Modified Gold Electrode

et al. 2013

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“…This electrode was conceived because despite good performance capabilities of mercury electrodes with respect to the adsorptive concentration of inorganic ions [196][197][198], they have some limitations at positive potential range, while many solid electrodes, which are operable over a wide interval of potentials, cannot selectively sorb the required component of the system. Adams' idea was not overlooked by other investigators, and in 1964, Kuwana et al performed research making the first contribution to the advancement of chemically modified carbon-paste electrodes, which are described in the reviews [199][200][201].…”

Section: Carbon-paste Electrodesmentioning

confidence: 99%

Modified carbon-containing electrodes in stripping voltammetry of metals

Stozhko

Малахова

Fyodorov

et al. 2008

J Solid State Electrochem

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Papers dealing with modified electrodes made of carbon materials and composites for use in stripping voltammetry of metals have been reviewed. The review consists of two parts, of which the first considers applications of modified glassy carbon and carbon paste electrodes, while the second describes diverse modified carbon-containing composite and microscopic electrodes. Information about modifiers, electrode modification methods, conditions, and limits of detection of elements in different materials has been tabulated. The review covers 550 papers published in Russia and abroad between 1990 and the first half of 2007.

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“…The latter technique relies on the interfacial accumulation of a complex of the target metal on the surface of the working electrode; this is an interesting approach, especially when the analyte cannot form an amalgam/alloy [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Pyrolyzed Photoresist Carbon Electrodes for Trace Electroanalysis of Nickel(II)

et al. 2015

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Novel pyrolyzed photoresist carbon electrodes for electroanalytical applications have been produced by photolithographic technology followed by pyrolysis of the photoresist. A study of the determination of Ni(II) dimethylglyoximate (Ni-DMG) through adsorptive cathodic stripping voltammetry at an in situ bismuth-modified pyrolyzed photoresist electrode (Bi-PPCE) is reported. The experimental conditions for the deposition of a bismuth film on the PPCE were optimized. The Bi-PPCE allowed the analysis of trace concentrations of Ni(II), even in the presence of Co(II), which is the main interference in this analysis, with cathodic stripping square wave voltammograms characterized by well-separated stripping peaks. The calculated limits of detection (LOD) were 20 ng•L −1 for Ni(II) alone and 500 ng•L −1 in the presence of Co(II). The optimized method was finally applied to the analysis of certified spring water (NIST1640a).

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Applications of adsorptive stripping voltammetry in the determination of trace and ultratrace metals

Cited by 129 publications

References 139 publications

Simultaneous Adsorptive Cathodic Stripping Voltammetric Determination of Nickel(II) and Cobalt(II) at an In Situ Bismuth‐Modified Gold Electrode

Simultaneous Adsorptive Cathodic Stripping Voltammetric Determination of Nickel(II) and Cobalt(II) at an In Situ Bismuth‐Modified Gold Electrode

Modified carbon-containing electrodes in stripping voltammetry of metals

Pyrolyzed Photoresist Carbon Electrodes for Trace Electroanalysis of Nickel(II)

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