Rapid determination of copper, lead and cadmium in unpurged seawater by adsorptive stripping voltammetry

Collado-Sánchez, C.; Pérez‐Peña, J.; Gelado-Caballero, M. D.; Melián, J.A. Herrera; Hernández‐Brito, J. J.

doi:10.1016/0003-2670(95)00513-7

Cited by 38 publications

(7 citation statements)

References 14 publications

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“…[24][25][26][27] They can manifest themselves in many ways such as amalgam (alloy) formation, catalytic effects and peak overlap. These intermetallic effects can distort the voltammetric response and affect the accuracy of the quantification, so it is necessary to be aware of their occurrence when analysing samples containing multiple metallic species.…”

Section: Resultsmentioning

confidence: 99%

Scanning electrochemical microscopy: study of the deposition and stripping mechanism of lead in the presence of copper

Sousa¹,

Sánchez²,

Bertazzoli³

2011

J. Braz. Chem. Soc.

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Este artigo descreve a utilização da microscopia eletroquímica de varredura (SECM) no modo geração pelo substrato/coleta pela ponta (SG/TC), com o objetivo de elucidar aspectos mecanísticos da deposição eletrolítica e redissolução anódica de íons Pb 2+ na presença de Cu 2+, utilizando-se um eletrodo de carbono vítreo como substrato. Um pico anódico foi observado entre os principais picos correspondentes à redissolução dos metais puros. A posição, intensidade e forma deste pico foram investigadas e foi verificado que eram função da razão entre as concentrações de Pb 2+ e Cu 2+. Os resultados sugerem que o pico é devido à dissolução do chumbo depositado sobre cobre, resultante de uma deposição em regime de subtensão. A SECM forneceu informações adicionais para o entendimento dos mecanismos de redissolução que não seriam obtidas a partir da análise apenas da resposta voltamétrica. This paper describes the application of scanning electrochemical microscopy (SECM) in the substrate-generation/tip-collection (SG/TC) mode to elucidate mechanistic aspects of the deposition and stripping of Pb 2+ ions in the presence of Cu 2+ into a glassy carbon substrate electrode. A stripping peak was observed between the main peaks corresponding to the pure metals. Its position, height and shape were investigated, and the peak intensity was found to depend on the Pb 2+ /Cu 2+ concentration ratio. The results suggested that this peak was due to the dissolution of lead deposited in copper, as a result of an underpotential deposition. The scanning electrochemical microscope provided additional information towards the understanding of the stripping mechanisms in analytical studies. In particular, the SECM-tip response yielded direct evidence about the speciation of some of the compounds evolved during stripping. This information was not available from the voltammetric response of the substrate electrode alone.

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Section: Resultsmentioning

confidence: 99%

Scanning electrochemical microscopy: study of the deposition and stripping mechanism of lead in the presence of copper

Sousa¹,

Sánchez²,

Bertazzoli³

2011

J. Braz. Chem. Soc.

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“…The efficiency of the elimination of mercury(II) during the treatment was evaluated by its removal efficiency ( ) given by the following equation: (1) where Co and C are respectively the concentrations of mercury(II) ions before and after the treatment.…”

Section: Resultsmentioning

confidence: 99%

“…These heavy metals, known as powerful toxic agents, are teratogenic and carcinogenic [1][2][3][4]. Their use as raw material in various production facilities is the source of the contamination of many effluents whose polluting loads are often very high compared to the standards.…”

Section: Introductionmentioning

confidence: 99%

Mercury(II) removal from water by electrocoagulation using aluminium and iron electrodes

Nanseu‐Njiki

Tchamango

Ngom

et al. 2009

Journal of Hazardous Materials

169

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“…Up to now, various methods including atomic absorption spectroscopy (AAS), 8 inductively coupled plasma atomic emission spectroscopy (ICP-AES), 9 inductively couple plasma mass spectroscopy (ICP-MS), 10 voltammetry, 11 potentiometry, 12,13 chemiluminescence [14][15][16] and fluorescence methods [17][18][19][20][21][22][23] have been developed to determine trace copper in aqueous samples. Among these methods, fluorimetric method shows great advantages over other analytical techniques, especially in bio-analytical fields, owing to its high sensitivity and nondestructive characteristics.…”

Section: Introductionmentioning

confidence: 99%

Near‐Infrared Fluorimetric Determination of Copper(II) Ions Using CdHgTe Nanorods as Probe

Jin

et al. 2010

Chin. J. Chem.

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Stable water-soluble CdHgTe nanorods with an emission wavelength at 722 nm, obtained by doping Hg 2+ into CdTe nanorods, has been used as a near-infrared region (NIR) probe to investigate their interaction with copper(II) ions. A new fluorimetric method for the determination of copper(II) ions has been developed based on the quenching effect of copper(II) ions on the emission of CdHgTe nanorods. The mechanism studies show that an effective electron transfer from nanorods to the copper(II) ions occurred based on the coordination reaction between copper(II) ions and the carboxyl groups on the nanorods surface, which could be responsible for the emission quenching of CdHgTe nanorods. Under optimum conditions, the linear range of the calibration curve for the determination of Cu 2＋ is from 8.0×10-9 to 1.0×10 -6 mol/L and the detection limit is 2.0×10 -9 mol/L. Owing to low background interference of NIR measurement, the proposed method displays relative high sensitivity and selectivity. Especially, some physiologically important cations almost do not interfere with the determination of Cu 2＋ . The proposed method was also applied to the determination of trace Cu 2＋ in real aqueous samples with satisfactory results.

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Rapid determination of copper, lead and cadmium in unpurged seawater by adsorptive stripping voltammetry

Cited by 38 publications

References 14 publications

Scanning electrochemical microscopy: study of the deposition and stripping mechanism of lead in the presence of copper

Scanning electrochemical microscopy: study of the deposition and stripping mechanism of lead in the presence of copper

Mercury(II) removal from water by electrocoagulation using aluminium and iron electrodes

Near‐Infrared Fluorimetric Determination of Copper(II) Ions Using CdHgTe Nanorods as Probe

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