Electroanalysis of copper as a heavy metal pollutant in water using cobalt oxide modified exfoliated graphite electrode

Ndlovu, Thabile; Arotiba, Omotayo A.; Sampath, S.; Krause, Rui W. M.; Mamba, Bhekie B.

doi:10.1016/j.pce.2012.08.007

Cited by 22 publications

(16 citation statements)

References 26 publications

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“…On the other hand, electrochemical techniques like anodic stripping voltammetry (ASV) have been used to detect various metals and semi metals (such as Pb , Ag , Se etc.) with detection limits in the sub ppb concentrations . Some studies included sample pretreatment before the measurement while in other studies no sample pretreatment was used .…”

Section: Introductionmentioning

confidence: 99%

Voltammetric Determination of Arsenic with Modified Glassy Carbon Electrode

et al. 2020

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In this study, glassy carbon electrode modified with nano gold‐crystal violet film has been used to detect arsenite (As (III)) in a model system and in groundwater samples. The modified electrode was characterized by scanning electrochemical microscopy (SECM) and electrochemical impedance spectroscopy (EIS). Using voltammetric measuring technique, linear response was obtained in a concentration range of 2.0–22.0 μM. The arsenite concentrations in groundwater samples varied between 2.4 μM to 4.8 μM. The sensitivity of the modified electrode for As (III) detection was 5.6 μA/μM cm2 and 0.8 μM concentration was found as lower limit of detection (LOD). The accuracy of the method was checked with standard method anodic stripping voltammetry (ASV). Groundwater samples were characterized with dynamic (DLS) and electrophoretic (ELS) light scattering measurements which have shown that particles present in different samples differ in size distribution and zeta potential which did not interfere with As (III) detection.

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Section: Introductionmentioning

confidence: 99%

Voltammetric Determination of Arsenic with Modified Glassy Carbon Electrode

et al. 2020

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“…A análise de elementos traços é feita, principalmente por técnicas espectroscópicas que na maioria das vezes requerem instrumentação sofisticada, cuja aquisição e manutenção são dispendiosas para análises rotineiras (1)(2)(3)(4) . Com este propósito também são utilizadas técnicas eletroquímicas que surgem como alternativas eficazes, simples e de baixo custo (5)(6)(7)(8)(9) .…”

Section: Introductionunclassified

“…Este trabalho teve como objetivo realizar um estudo acerca da determinação de metais em meio aquoso utilizando o eletrodo DDB com a técnica AdASV. Foi selecionado como eletrólito suporte o Tampão Britton -Robinson 0,04 mol L -1 , pH (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11), e o EDTA como agente quelante. Para o estudo do processo adsortivo na superfície do eletrodo DDB, foi analisado o comportamento voltamétrico do complexo Fe-EDTA.…”

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Estudo do processo adsortivo do complexo Fe-EDTA na superfície do eletrodo de diamante dopado com boro

Ferreira

Baldan

Ferreira

et al. 2016

RBAV

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The stripping voltammetry are important electrochemical techniques in trace metals analysis. In current literature there is no study of the adsorptive anodic stripping voltammetry (AdASV) technical for the determination of metal ions, using the Boron Doped Diamond Electrode (BDD). This study aimed to carry out a study on the determination of metals ions in aqueous medium using the BDD electrode with AdASV technique. The supporting electrolyte selected was Britton-Robinson buffer 0,04 mol L-1 , pH (1-11), and EDTA as chelating agent. For the study of adsorptive process on BDD surface the voltammetric behavior of the complex Fe-EDTA was studied. The AdASV methodology was optimized by varying the following parameters: deposition time (Td), deposition potential (Ed), frequency (f) and amplitude (a). After such optimization, a comparative study was carried out concerning the Fe 2+ oxidation process on the surface of BDD electrode in the presence and absence of EDTA. The results show that the Fe-EDTA complex formed performs adsorption on the surface of BDD electrode utilizing procedures and parameters studied in this work. In this way, this optimized methodology can be used for ion Fe 2+ detection in aqueous solution.

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“…Thus, the development of a simple, rapid and sensitive analytical method for the determination of Cu 2+ in water samples is important. Various methods have been developed for the quantification of Cu 2+ such as electrochemical , flame atomic adsorption spectroscopy and inductively coupled plasma mass spectroscopy . However, these techniques are complicated, use expensive instruments and are time consuming.…”

Section: Introductionmentioning

confidence: 99%

A selective determination of copper ions in water samples based on the fluorescence quenching of thiol‐capped CdTe quantum dots

2015

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CdTe quantum dots (QDs) capped with different stabilizers, i.e. thioglycolic acid (TGA), 3-mercaptopropionic acid (MPA) and glutathione (GSH) were investigated as fluorescent probes for the determination of Cu(2+). The stabilizer was shown to play an important role in both the sensitivity and selectivity for the determination of Cu(2+). TGA-capped CdTe QDs showed the highest sensitivity, followed by the MPA and GSH-capped CdTe QDs, respectively. The TGA- and MPA-capped CdTe QDs were not selective for Cu(2+) that was affected by Ag(+). The GSH-capped CdTe QDs were insensitive to Ag(+) and were used to determine Cu(2+) in water samples. Under optimal conditions, quenching of the fluorescence intensity (F0/F) increased linearly with the concentration of Cu(2+) over a range of 0.10-4.0 µg/mL and the detection limit was 0.06 µg/mL. The developed method was successfully applied to the determination of Cu(2+) in water samples. Good recoveries of 93-104%, with a relative standard deviation of< 6% demonstrated that the developed simple method was accurate and reliable. The quenching mechanisms were also described.

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Electroanalysis of copper as a heavy metal pollutant in water using cobalt oxide modified exfoliated graphite electrode

Cited by 22 publications

References 26 publications

Voltammetric Determination of Arsenic with Modified Glassy Carbon Electrode

Voltammetric Determination of Arsenic with Modified Glassy Carbon Electrode

Estudo do processo adsortivo do complexo Fe-EDTA na superfície do eletrodo de diamante dopado com boro

A selective determination of copper ions in water samples based on the fluorescence quenching of thiol‐capped CdTe quantum dots

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