Cathodic stripping voltammetry of trace Mn(II) at carbon film electrodes

Filipe, Olga M.S.

doi:10.1016/s0039-9140(03)00327-8

Cited by 73 publications

(64 citation statements)

References 39 publications

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“…In previous publications [14,15] carbon film cylinder electrodes made from electrical resistors have been investigated electrochemically and their application in trace metal analysis by stripping voltammetry demonstrated. Characterization by electrochemical impedance spectroscopy [16] was carried out in several electrolytes used in electroanalytical experiments over a wide range of pH values, studying the influence of pretreatment of the electrode surface by potential cycling in perchloric acid on the voltammetric profile.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Characterization of Nafion‐Coated Carbon Film Resistor Electrodes for Electroanalysis

Gouveia‐Caridade

Brett

2005

Electroanalysis

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Carbon film disk electrodes with Nafion coatings have been characterized by electrochemical impedance spectroscopy (EIS) with a view to a better understanding of their advantages and limitations in electroanalysis, particularly in anodic stripping voltammetry of metal ions. After initial examination by cyclic voltammetry, spectra were recorded over the full potential range in acetate buffer solution at the bare electrodes, electrodes electrochemically pretreated in acid solution, and Nafion-coated pretreated electrodes in the presence and absence of dissolved oxygen. EIS equivalent circuit analysis clearly demonstrated the changes between these electrode assemblies. In order to simulate anodic stripping voltammetry conditions, spectra were also obtained in the presence of cadmium and lead ions in solution at Nafion-coated electrodes, both after metal ion deposition and following re-oxidation. Permanent changes to the structure of the Nafion film occurred, which has implications for use of these electrode assemblies in anodic stripping voltammetry at relatively high trace metal ion concentrations.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Characterization of Nafion‐Coated Carbon Film Resistor Electrodes for Electroanalysis

Gouveia‐Caridade

Brett

2005

Electroanalysis

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“…The use of the following commercially available electrode materials is reported in the literature: pencil lead [1][2][3]; spectral [4,5], pyrolitic [6], and felt [7] graphites; carbon glass ceramic [8][9][10]; nonwoven graphite films [11]; carbon film resistors; and switches [12][13][14][15][16]. In most cases, electrodes of these materials are modified by metal films (mercury, copper, and bismuth), molecularly imprinted TiO 2 [17].…”

Section: Graphitized Carbon and Composite Electrodesmentioning

confidence: 99%

“…Prospects for the future development of solid-state modified electrodes are considered. [12][13][14][15][16]. In most cases, electrodes of these materials are modified by metal films (mercury, copper, and bismuth), molecularly imprinted TiO 2 [17].…”

mentioning

confidence: 99%

Modified carbon-containing electrodes in stripping voltammetry of metals. Part II. Composite and microelectrodes

Stozhko

Малахова

Fyodorov

et al. 2007

J Solid State Electrochem

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The second part of the review, which covers modified carbon-containing electrodes, describes composite and microelectrodes. Electrodes made of commercial and laboratory carbon-containing composite materials are discussed. Impregnated and thick-film electrodes and microelectrodes made of carbon fibers form a separate group. Various modifiers and methods of electrode modification are presented. Prospects for the future development of solid-state modified electrodes are considered. [12][13][14][15][16]. In most cases, electrodes of these materials are modified by metal films (mercury, copper, and bismuth), molecularly imprinted TiO 2 [17]. The occurrence in the last decade of new types of carbon materials "from carbon nanotubes to edge plane pyrolytic graphite" [18,19] has significantly changed the scope and sensitivity of electroanalytical methods for the measurement of diverse targets from metals ions to biological markers. Investigators considered in detail electrochemical characteristics [20] and practical use [21] of the "edge" plane pyrolytic graphite, which proved to have a wider interval of working potentials and a low detection limit as compared to those of the basal pyrolytic graphite and GC. For example, in situ bismuth film modified edge plane pyrolytic graphite electrode was successfully applied to the ultra trace simultaneous determination of cadmium(II) and lead(II) with detection limit 5.5·10 −10 and 4·10 −10 M, respectively [22].Synthetic diamonds (nitrogen-[23, 24] and boron-doped ) have come into use quite recently for electrochemical measurements. In particular, a gold-coated, borondoped, diamond thin-film electrode was used for total inorganic arsenic detection in real water samples [50]. Unlike properties of other carbon materials, which are widely used in electroanalysis, properties of synthetic diamonds became the subject of comprehensive study just about 10 years ago. The research was hindered by two circumstances: shortage of the material and the absence of conduction. The situation radically changed with the advent of highly efficient methods for growing of polycrystalline diamond compounds.A more efficient separation, accumulation, and determination of components is achieved with electrodes of composite materials made of graphite, carbon, glassy carbon, or diamond powders and binders such as paraffin, epoxy resins, methacrylate, silicon, styrene-acrylonitrile copolymer, polyester, and silica gel. The reviews [51][52][53][54] deal with properties and applications of various composite J Solid State Electrochem

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“…A presença do íon Pb(II) em concentrações excedendo em até 61 vezes a concentração do íon Mn(II) não interfere mais. Entretanto, um aumento na razão Pb/Mn leva a um aumento na corrente de pico, bem como o potencial de redução desloca-se para valores mais negativos, em concordância com as observações feitas por Jin et al 41 e Filipe et al 13 . Esta interferência é provavelmente devida ao fato de que os íons Pb(II) são facilmente oxidados, com formação de PbO 2 , o qual pode ser depositado sobre a superfí-cie do eletrodo de trabalho juntamente com o óxido de manganês.…”

Section: Interferênciasunclassified

Determinação de manganês em material particulado atmosférico de ambientes de trabalho utilizando eletrodo de diamante dopado com boro e voltametria de onda quadrada com redissolução catódica

Felix¹,

Barros²,

Lichtig³

et al. 2005

Quím. Nova

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Neidenêi Gomes FerreiraInstituto Nacional de Pesquisas Espaciais, CP 515, 12210-970 São José dos Campos -SP Recebido em 24/9/04; aceito em 21/3/05; publicado na web em 10/8/05 DETERMINATION OF MANGANESE IN PARTICULATE MATTER OF WORKPLACE ENVIRONMENTS USING A BORON-DOPED DIAMOND ELECTRODE AND CATHODIC STRIPPING SQUARE WAVE VOLTAMMETRY.A boron-doped diamond electrode is used for determination of Mn(II) in atmospheric particulate matter by square wave cathodic stripping voltammetry. The analytical curve was linear for Mn(II) concentrations between 5.0 and 37.5 μg L -1 , with quantification limit of 3.6 μg L -1 . The precision was evaluated by the relative standard deviation, with values between 5.1% and 9.3%. The electrode is free of adsorption, minimizing memory effects. Samples collected in the workplace atmosphere of a foundry had Mn(II) concentrations between 0.4 and 4 μg m -3 . No significant differences were observed between the proposed method and inductively coupled plasma optical emission spectroscopy.Keywords: manganese; boron-doped diamond; square wave voltammetry. INTRODUÇÃOFundições são processos industriais muito antigos que datam de aproximadamente 4000 a.C., sendo que os mais usados são a fundição em areia e suas ramificações. Esta é a mais adequada para ferro e aço, com altas temperaturas de fusão, mas também predomina para latão, alumínio, bronze e magnésio 1 . Através do processo de fundição é possível a obtenção de objetos na forma final definida, mediante o vazamento do metal fundido em um molde preparado. A maior parte das empresas da região sul do Brasil utiliza a mesma liga de latão nos processos de fundição de torneiras e registros, composta com aproximadamente 29% de zinco, 64% de cobre e o percentual restante constituído de manganês, antimônio, fósforo, enxofre, entre outros 2 .Considerando que nas etapas do processo ocorre a presença de material particulado na atmosfera do ambiente de trabalho, existe sempre o risco de contaminação do ar, da água, do solo, bem como dos trabalhadores. O manganês é um dos elementos com grande potencial toxicológico, podendo causar danos às funções neuroló-gicas, desordens extrapiramidais, manganismo, bem como bronquite aguda, asma brônquica e pneumonia 1,3 . Métodos muito sensí-veis são utilizados para determinação de partículas metálicas no ar, tais como espectrometria de absorção atômica com chama ou forno de grafite, bem como a espectrometria de emissão óptica com plasma acoplado indutivamente (ICP OES) 4-8 .Na literatura, são poucas as referências que relatam a determinação de manganês por voltametria de redissolução em particulados atmosféricos 9,10 . Quando aliada à voltametria de onda quadrada ("SWV -Square Wave Voltammetry"), as análises tornam-se mais rápidas e sensíveis, devido, principalmente, à minimização da contribuição da corrente capacitiva, além de se poder trabalhar com altas velocidades de varredura 11,12 . A determinação dos íons Mn(II) por esta técnica envolve uma etapa de pré-concentração, na qual estes íons são oxidados a Mn(IV), na ...

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Cathodic stripping voltammetry of trace Mn(II) at carbon film electrodes

Cited by 73 publications

References 39 publications

Electrochemical Impedance Characterization of Nafion‐Coated Carbon Film Resistor Electrodes for Electroanalysis

Electrochemical Impedance Characterization of Nafion‐Coated Carbon Film Resistor Electrodes for Electroanalysis

Modified carbon-containing electrodes in stripping voltammetry of metals. Part II. Composite and microelectrodes

Determinação de manganês em material particulado atmosférico de ambientes de trabalho utilizando eletrodo de diamante dopado com boro e voltametria de onda quadrada com redissolução catódica

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