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

Zhang, Li; Pan, Dawei; Liu, Yangsheng

doi:10.1007/s11581-015-1596-7

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…for Ga 112 [57], Te [58] or Fe [59]), a large amount of research is now devoted to greener and more 113 user-friendly solid and/or film electrodes. Latest development for analysis of water 114 samples include methods for Ni [60], Ag [61], Co [62], Mn [63], V [64;65], U [66], 115…”

Section: List Of Nomenclature and Abbreviationsmentioning

confidence: 99%

A review on electrochemical methods for trace metal speciation in environmental media

Companys

Galceran

Pinheiro

et al. 2017

Current Opinion in Electrochemistry

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11Trace metal speciation is key to understand/predict bioavailability and potential toxicity 12 of metals to biota and will, undoubtedly, be incorporated in future regulations. 13Electroanalytical methods have a role to play in such development: they offer a wide 14 range of advantages such as speed, portability, economy, solid interpretation 15 backgrounds and low limits of quantification. This review focusses on three selected 16 stripping techniques: Competitive-Ligand Exchange -Cathodic Stripping Voltammetry 17 (CLE-CSV), Scanned Stripping Chrono-Potentiometry (SSCP) and AGNES (Absence 18 of Gradients and Nernstian Equilibrium Stripping) reporting their working principles, 19 characteristics (strong and weak points) and recent applications to systems of 20 environmental relevance (such as seawaters, freshwaters or soil extracts). 21 22 23 24 Keywords: speciation, availability, electroanalysis, electrochemistry, heavy metal, 25 CLE-CSV, SSCP, AGNES 26 27 published in Current Opinion 3 (2017) 144-162 33 Speciation (i.e. the distribution of an element among its different chemical forms[1]) 34 has been recognised as a key factor for trace metal (bio)availability to biota, as 35 postulated by hegemonic ecotoxicological paradigms such as the Free Ion Activity 36 Model (FIAM) [2] or the Biotic Ligand Model (BLM)[3], both assuming that the free 37 ion is the only bioavailable species. The limits of these models have recently been 38 reviewed [4], highlighting numerous cases where specific fractions of metal complexes 39 can be internalized, either directly or through the dissociation of labile complexes. Thus, 40there is a need to design, develop, apply and interpret analytical techniques able to 41 provide reliable speciation information [5][6][7] that can be used by regulatory bodies. 42Although there are numerous non-electrochemical techniques [5][6][7][8][9][10][11][12][13], those that are 43 provide attractive possibilities such as speed of analysis, low-cost and miniaturization in 44 view to on-site (and in-situ) measurements [14], and can also provide thermodynamic 45 (i.e. equilibrium) information (such as the amount of the free metal, the amount of 46 complexing sites, the stoichiometry of complexes and their stability constants [15]) as 47 [16;17]. Stripping techniques, due to their low detection limits, are well suited for 50 environmental analysis. They are two-stage techniques, where the first stage is a 51 deposition step that accumulates the analyte (at the electrode surface or in its volume), 52 followed by a second stage that quantifies this analyte. Anodic Stripping Voltammetry 53 (ASV), in its multiple variants, is the most popular and has the advantage to possibly be 54 measuring a potentially bioavailable fraction of the metal, as shown again recently 55 [18;19]. 56 57 published in Current Opinion 3 (2017) 144-162 This critical evaluation focusses on three techniques that are known powerful tools for 58 metal speciation: AGNES (Absence of Gradients and Nernstian Equilibrium Stripping) 59 and SSCP...

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Section: List Of Nomenclature and Abbreviationsmentioning

confidence: 99%

A review on electrochemical methods for trace metal speciation in environmental media

Companys

Galceran

Pinheiro

et al. 2017

Current Opinion in Electrochemistry

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“…A wide range of complexing agents have been employed in stripping analysis and are highly dependent on the application. Dioximes such as, nioxime [ 11 , 12 , 13 ] and more popularly dimethylglyoxime (DMG) [ 8 , 10 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] have gained widespread attention.…”

Section: Introductionmentioning

confidence: 99%

Complexation-Based Detection of Nickel(II) at a Graphene-Chelate Probe in the Presence of Cobalt and Zinc by Adsorptive Stripping Voltammetry

Pokpas

Jahed

Baker

et al. 2017

Sensors

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The adsorptive stripping voltammetric detection of nickel and cobalt in water samples at metal film electrodes has been extensively studied. In this work, a novel, environmentally friendly, metal-free electrochemical probe was constructed for the ultra-trace determination of Ni2+ in water samples by Adsorptive Cathodic Stripping Voltammetry (AdCSV). The electrochemical platform is based on the adsorptive accumulation of Ni2+ ions directly onto a glassy carbon electrode (GCE) modified with dimethylglyoxime (DMG) as chelating agent and a Nafion-graphene (NGr) nanocomposite to enhance electrode sensitivity. The nafion-graphene dimethylglyoxime modified glassy carbon electrode (NGr-DMG-GCE) shows superior detection capabilities as a result of the improved surface-area-to-volume ratio and enhanced electron transfer kinetics following the incorporation of single layer graphene, while limiting the toxic effects of the sensor by removal of the more common mercury, bismuth and lead films. Furthermore, for the first time the NGr-DMG-GCE, in the presence of common interfering metal ions of Co2+ and Zn2+ demonstrates good selectivity and preferential binding towards the detection of Ni2+ in water samples. Structural and morphological characterisation of the synthesised single layer graphene sheets was conducted by Raman spectrometry, HRTEM and HRSEM analysis. The instrumental parameters associated with the electrochemical response, including accumulation potential and accumulation time were investigated and optimised in addition to the influence of DMG and graphene concentrations. The NGr-DMG-GCE demonstrated well resolved, reproducible peaks, with RSD (%) below 5% and a detection limit of 1.5 µg L−1 for Ni2+ reduction at an accumulation time of 120 s. The prepared electrochemical sensor exhibited good detection and quantitation towards Ni2+ detection in tap water samples, well below 0.1 mg L−1 set by the WHO and EPA standards. This is comparable to the South African drinking water guidelines of 0.15 mg L−1.

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“…Constructed by an in situ or ex situ electroplating method on different substrates, [20][21][22] BiFEs are now widely used for the determination of trace metals like Pd, Sn, Cd, Zn, Co, Cu, etc. [23][24][25][26][27][28] Though ASV is highly sensitive for the detection of trace chemical species, it suffers from low selectivity. This problem is prone to occur when dealing with multi-analyte signals and the oxidation and/or reduction potentials of those analytes, such as lead and tin, are very close to each other.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of lead and tin at the bismuth film electrode by square wave stripping voltammetry and chemometric methods

et al. 2016

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The voltammograms of lead and tin are strongly overlapped due to their similar 8 properties in electroanalysis, making it difficult for the individual quantification of each analyte. A 9 square wave anodic stripping voltammetry (SWASV) method for the simultaneous determination 10 of the two metals at the bismuth film electrode (BiFE) was proposed. The experimental conditions 11 were investigated and optimized. The linear dynamic ranges and limits of detection (LOD) were 12 determined as 4-150 µg/L and 1.13 µg/L for lead, and 4-110 µg/L and 0.74 µg/L for tin. Radial 13 basis function artificial neural network (RBF-ANN) was introduced to solve the resolution 14 problem, and its performance was compared with the conventional chemometrics methods 15 including principal component regression (PCR), partial least squares (PLS) and least-squares 16 support vector machines (LS-SVM). By analyzing a set of synthetic mixtures of the two metals 17with the proposed methods, the lowest root-mean-square error of calibration (RMSEC) and 18 root-mean-square error of prediction (RMSEP) were achieved with RBF-ANN and the method 19 was applied to real tap water samples spiked with known amounts of lead and tin with satisfactory 20 recoveries of 105% and 102% respectively. Therefore, SWASV coupled with RBF-ANN is an 21 effective alternative used for the simultaneous determination of lead and tin. 22 23

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

Cited by 8 publications

References 44 publications

A review on electrochemical methods for trace metal speciation in environmental media

A review on electrochemical methods for trace metal speciation in environmental media

Complexation-Based Detection of Nickel(II) at a Graphene-Chelate Probe in the Presence of Cobalt and Zinc by Adsorptive Stripping Voltammetry

Simultaneous determination of lead and tin at the bismuth film electrode by square wave stripping voltammetry and chemometric methods

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