The effects of CopperZinc and CopperCadmium intermetallic compounds in different systems used for anodic stripping voltammetry

Wise, John A.; Roston, Daryl A.; Heineman, William R.

doi:10.1016/0003-2670(83)80010-5

Cited by 40 publications

(20 citation statements)

References 17 publications

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“…As the procedure of voltammetric measurements included a zinc oxidation peak as well, it was found very interesting to present and to try to interpret behaviour of zinc pseudopolarograms in addition to the copper ones. The formation of CuZn intermetallic compound is not likely to occur, because of much lower concentrations of copper and zinc in our experiments when compared to those reported in literature, which should be in a milli-molar range [33,34]. While in the original sample total copper(II) concentration was found to be (1.48 ± 0.12) × 10 −8 mol L −1 , the concentration was 100 times higher (1.43 ± 0.17) × 10 −6 mol L −1 in the concentrated sample.…”

Section: Resultscontrasting

confidence: 53%

Study of interactions of concentrated marine dissolved organic matter with copper and zinc by pseudopolarography

Nicolau¹,

Louis²,

Omanović³

et al. 2008

Analytica Chimica Acta

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The interaction of dissolved organic matter (DOM) with copper and zinc in a concentrated seawater sample was characterised by pseudopolarography. Measurements performed at increased concentrations of copper(II) ions showed successive saturation of active DOM sites which indicate possible partition of copper between (i) free or labile complexes, (ii) reduced and released within the potential window of the method, and (iii) electroinactive copper complexes. Pseudopolarograms measured at pH 4 indicate a release of copper which was bound to the active sites of DOM that formed non-labile complexes. Variation of the peak position and half-peak width along the scanned deposition potentials and with the increasing concentration of copper bear the information about the complex electrochemical processes at the electrode surface and in the bulk of the solution. Pseudopolarograms of zinc showed a strong dependence of the peak current and the peak position along the scanned deposition potentials on pH values, indicating preferentially complexation of zinc with carboxylic-like active sites of DOM in the measured sample. Pseudopolarography is a valuable method in the trace metal complexation and speciation studies, serving as a fingerprint of the analysed sample.

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Section: Resultscontrasting

confidence: 53%

Study of interactions of concentrated marine dissolved organic matter with copper and zinc by pseudopolarography

Nicolau¹,

Louis²,

Omanović³

et al. 2008

Analytica Chimica Acta

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“…This behavior is probably due to the depression of the cadmium wave by copper. The oxidation of the Cu‐Cd intermetallic compounds occurs near the same potential as copper, which increases the peak current of copper, and decreases the current of cadmium 44, 45.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Detection of Heavy Metals by Anodic Stripping Voltammetry Using Carbon Nanotube Thread

Zhao¹,

Guo²,

Wang³

et al. 2014

Electroanalysis

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111

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Carbon nanotube (CNT) threads are a type of CNT arrays that consist of super long CNTs. CNT threads inherit the advantages of CNTs, while avoiding the potential toxicity caused by individual CNTs. Electrodes based on CNT threads were fabricated and used for simultaneous detection of trace levels of Cu2+, Pb2+ Cd2+ and Zn2+ by anodic stripping voltammetry (ASV). The detection limits are 0.27 nM, 1.5 nM, 1.9 nM and 1.4 nM for Cu2+, Pb2+, Cd2+ and Zn2+, respectively, in 0.1 M acetate buffer pH 4.5. The CNT thread electrode gives well‐defined, reproducible and sharp stripping signals for individual and simultaneous detection of heavy metals.

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“…The requirement for deoxygenation is not an insurmountable hindrance, even for in situ measurements, as various efficient online systems have been developed [4,18]. It is noted that any deposition step-related complications that may occur in SV will also be problematic for SCP, including i) formation of intermetallic compounds such as Zn/Cu [22], ii) insufficient ligand excess during the accumulation step, in the sense that, e.g., for a fully labile complex system the mean diffusion coefficient is no longer a constant over the diffusion layer if a significant gradient in ligand is present [9,23], and iii) the need to buffer solutions in some cases to avoid pH changes at the sensor surface [18].…”

Section: à3mentioning

confidence: 99%

Depletive Stripping Chronopotentiometry: A Major Step Forward in Electrochemical Stripping Techniques for Metal Ion Speciation Analysis

Town

Leeuwen

2004

Electroanalysis

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A comparative evaluation of the utility of the various modes of stripping chronopotentiometry (SCP) for trace metal speciation analysis is presented in the broad context of stripping voltammetric techniques. The remarkable fundamental advantages of depletive SCP at scanned deposition potential (SSCP) are highlighted, and the rigorous underpinning theory is described. The distinctive features of SSCP include: i) an effective getting around part of the Nernstian extension of the reoxidation process, leading to ii) greater resolution than conventional stripping voltammetries; iii) a certain insensitivity to electrochemical irreversibility, especially at a microelectrode; iv) in principle, freedom from induced metal ion adsorption interferences; v) no requirement for excess ligand during stripping; and vi) ability to provide a certain measure of any chemical heterogeneity in the metal speciation that is easily distinguishable from effects of electrochemical irreversibility.

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The effects of CopperZinc and CopperCadmium intermetallic compounds in different systems used for anodic stripping voltammetry

Cited by 40 publications

References 17 publications

Study of interactions of concentrated marine dissolved organic matter with copper and zinc by pseudopolarography

Study of interactions of concentrated marine dissolved organic matter with copper and zinc by pseudopolarography

Simultaneous Detection of Heavy Metals by Anodic Stripping Voltammetry Using Carbon Nanotube Thread

Depletive Stripping Chronopotentiometry: A Major Step Forward in Electrochemical Stripping Techniques for Metal Ion Speciation Analysis

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