Ceramic composite electrode for the determination of selenium(IV) by stripping voltammetry

Stozhko, N. Yu.; Моросанова, Е. И.; Kolyadina, L. I.; Fomina, S. V.

doi:10.1134/s1061934806020122

Cited by 30 publications

(18 citation statements)

References 33 publications

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“…A maior parte das diferentes configurações de eletrodos de carbono cerâmico descritas na literatura utiliza precursores hidrofóbicos, em particular o metiltrimetoxissilano, para a construção de sensores eletroquímicos. [12][13][14][15][16][17][18][19][20] Tal característica pode ser explicada devido ao aumento da hidrofobicidade da interfase eletrodo-solução, possibilitando que somente poucas partículas de carbono na superfície do eletrodo fiquem em contato com o eletrólito. Esta configuração minimiza a corrente de fundo, a qual é proporcional à superfície condutora do eletrodo, aumentando a sensibilidade do mesmo.…”

Section: Introductionunclassified

Otimizaçâo das condições de preparação de eletrodos à base de carbono cerâmico utilizando-se planejamento fatorial

Skeika¹,

Pessôa²,

Fujiwara³

et al. 2010

Quím. Nova

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Recebido em 28/4/09; aceito em 13/10/09; publicado na web em 11/3/10 OPTIMIZATION OF ELECTRODES CONDITIONS PREPARATION BASED CARBON CERAMIC USING FACTORIAL DESIGN. Different parameters of carbon ceramic electrodes (CCE) preparation, such as type of precursor, carbon material, catalyst amount, among others, significantly influence the morphological properties and consequently their electrochemical responses. This paper describes a 2 3 factorial design (2 factors and 3 levels with central point replicates), which the factors analyzed were catalyst amount (HCl 12 mol L -1 ), graphite/precursor ratio, and precursor type (TEOS -tetraethoxysilane and MTMOSmethyltrimetoxysilane). The design resulted in a significant third order interaction for peak current values (Ipa) and a second order interaction for potential difference (DE), between thefactors studied, which could not be observed when using an univariated study.Keywords: carbon ceramic electrodes; cyclic voltammetry; factorial design. INTRODUÇÃORecentemente tem havido um crescente interesse no estudo de uma nova geração de materiais que apresentam alta condutividade elétrica, os chamados eletrodos de carbono cerâmico (ECC), os quais são basicamente obtidos através da dopagem da matriz de sílica obtida pelo método sol-gel com o pó de carbono ou grafite. [1][2][3][4][5] Os primeiros eletrodos obtidos através dessa técnica foram propostos pelo grupo de Lev e colaboradores e desde então têm sido aplicados na determinação de diversas espécies de interesse farmacológico e ambiental. 6 Existem inúmeras vantagens destes materiais em relação aos demais eletrodos à base de carbono, sendo que a principal delas consiste na combinação das propriedades do processo sol-gel (tal como alta área superficial) e a condutividade dos materiais de carbono, possibilitando a obtenção de um eletrodo de superfície renovável similar ao eletrodo de pasta de carbono, porém mais robusto e de maior estabilidade. 7-11O método de preparação do eletrodo de carbono cerâmico influencia diretamente nas suas propriedades condutoras, mecânicas e morfológicas, sendo estas refletidas na resposta eletroquímica do eletrodo. A maior parte das diferentes configurações de eletrodos de carbono cerâmico descritas na literatura utiliza precursores hidrofóbicos, em particular o metiltrimetoxissilano, para a construção de sensores eletroquímicos.12-20 Tal característica pode ser explicada devido ao aumento da hidrofobicidade da interfase eletrodo-solução, possibilitando que somente poucas partículas de carbono na superfície do eletrodo fiquem em contato com o eletrólito. Esta configuração minimiza a corrente de fundo, a qual é proporcional à superfície condutora do eletrodo, aumentando a sensibilidade do mesmo.10 Por outro lado, a obtenção de um eletrodo compósito hidrofílico é menos empregada, permitindo a construção de um eletrodo permeável a soluções aquosas. 15O tipo de material de carbono é considerado outro fator que influencia na resposta dos ECC, em particular na sua condutividade e propriedades mecânicas. ...

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Section: Introductionunclassified

Otimizaçâo das condições de preparação de eletrodos à base de carbono cerâmico utilizando-se planejamento fatorial

Skeika¹,

Pessôa²,

Fujiwara³

et al. 2010

Quím. Nova

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“…The second type, known as membrane electrodes are generally used to monitor common anions such as perchlorates, nitrates, and carbonates (7). While commercial selenite electrodes were not available, the literature provided the description of several prototypes, of both the membrane and solid-state types (8)(9)(10)(11)(12)(13)(14)(15)(16). After thorough screening in the context of the intended application that involves a complex corrosive industrial weak acid, most of them were found unsuitable because of efficiency, durability, or interference issues.…”

Section: Introductionmentioning

confidence: 99%

The Rapid Measurement and Monitoring of Selenite Concentration by Turbidimetry Following its Conversion to Colloidal State by Sulfite Reduction and Acidification

Geoffroy¹,

Demopoulos²

2012

Separation Science and Technology

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In this study, the rapid reduction of selenious ions using sulfite species at negative pH is described and its use as analytical technique in combination with turbidimetry is proposed. It was found that Se(IV) can be reduced quantitatively at ambient temperature via a combination of sulfite reduction and ultra-acidification with sulfuric acid to a colloidal form that can be determined using turbidimetry. The developed analytical procedure can accurately and reproducibly measure Se(IV) concentrations down to 1 mg/L. For concentrations above 20 mg/L dilution is necessary. Common transition metal ions such as iron(II), copper(II), or zinc(II) up to 10 g/L concentration were found not to have noticeable influence on the precision of the method. Finally the developed technique was shown to be equally effective with real Se(IV)-bearing industrial solutions generated in a zinc concentrate roasting operation, hence making the method particularly useful as a fast and simple process monitoring and control tool.

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“…The analytical methods most often used to determine traces of selenium in environmental samples are atomic absorption spectrometry (AAS) [4,5], inductively coupled plasma atomic emission spectrometry (ICP-AES) [6], inductively coupled plasma mass spectrometry (ICP-MS) [7], neutron activation analysis [8], voltammetry [9]. In case of voltammetry used are stripping methods such as anodic stripping voltammetry (ASV) at gold [10 -12] and carbon electrodes [13], adsorptive stripping voltammetry [14,15] and cathodic stripping voltammetry (CSV) at copper microelectrode [16], copper-modified mercury-film electrode [17], hanging copper amalgam drop electrode [18], ceramic composite electrode [19] or silver disk electrode [20]. A very sensitive cathodic stripping voltammetry based on the formation of HgSe deposited on the surface of the mercury electrode [21 -25] and mercury-film electrodes (MFE-GC) [26] are described.…”

Section: Introductionmentioning

confidence: 99%

Determination of Selenium Traces on Cyclic Renewable Mercury Film Silver Electrode in Presence of Copper Ions Using Cathodic Stripping Voltammetry

Piech

2008

Electroanalysis

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The new cyclic renewable mercury film silver based electrode (Hg(Ag)FE), applied for the determination of selenium(IV) traces in the presence of copper ions using differential pulse cathodic stripping voltammetry (DP CSV) is presented. The preparation of the Hg(Ag)FE is very simple. The effects of various factors such as: preconcentration potential and time, pulse height, step potential and supporting electrolyte composition are optimized. The calibration graph is linear from 0.5 nM (39 ng L À1) to 100 nM (7.9 mg L À1) for a preconcentration time of 45 s, with correlation coefficient of 0.9995. For a Hg(Ag)FE with a surface area of 8 mm 2 the detection limit for a preconcentration time of 90 s is as low as 17 ng L À1 . The repeatability of the method at a concentration level of the analyte as low as 2 mg L À1 , expressed as RSD is 2.7% (n ¼ 7). The proposed method was successfully applied and validated by studying the certified reference material (bovine liver BCR-185) and simultaneously recovery of Se(IV) from spiked water samples.

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Ceramic composite electrode for the determination of selenium(IV) by stripping voltammetry

Cited by 30 publications

References 33 publications

Otimizaçâo das condições de preparação de eletrodos à base de carbono cerâmico utilizando-se planejamento fatorial

Otimizaçâo das condições de preparação de eletrodos à base de carbono cerâmico utilizando-se planejamento fatorial

The Rapid Measurement and Monitoring of Selenite Concentration by Turbidimetry Following its Conversion to Colloidal State by Sulfite Reduction and Acidification

Determination of Selenium Traces on Cyclic Renewable Mercury Film Silver Electrode in Presence of Copper Ions Using Cathodic Stripping Voltammetry

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