Simultaneous electrochemical determination of nitrate and nitrite in aqueous solution using Ag-doped zeolite-expanded graphite-epoxy electrode

Manea, Florica; Remes, Adriana; Radovan, Ciprian; Pode, Rodica; Picken, Stephen J.; Schoonman, J.

doi:10.1016/j.talanta.2010.08.042

Cited by 94 publications

(43 citation statements)

References 36 publications

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“…Despite the increase in electrode size/area after Ag deposition, we still observed a sigmoidal-shaped CV scan in the presence of 4 mM nitrate using the Ag/CE; the steady state current was 300 nA, significantly higher than the current observed in a nitratefree solution (12.5 nA) ( Fig. 2A) [33]. Similar to the Ag/CE, the Ag/ AgE also showed a catalytic response to nitrate; the steady-state current was~480 nA, much higher than the background current (53.5 nA) (Fig.…”

Section: Sensor Characterization Using Cyclic Voltammetry and Chronoamentioning

confidence: 81%

“…While several other groups have reported the high catalytic activity of copper towards nitrate reduction, they have also shown that copper performs well only in an acidic or alkaline medium [19,20]. Nanostructured silver (Ag) has also been explored as a catalyst for nitrate reduction, the main advantage of this detection approach is the possibility of using it in a neutral medium [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate

Zhad¹,

Lai²

2015

Analytica Chimica Acta

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Section: Sensor Characterization Using Cyclic Voltammetry and Chronoamentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate

Zhad¹,

Lai²

2015

Analytica Chimica Acta

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“…101 Dois pulsos de potenciais foram aplicados sequencialmente. Em E 1 , nitrato é reduzido e em E 2 , nitrito é oxidado.…”

Section: Análise Simultâneaunclassified

Análise por injeção em fluxo com detecção amperométrica de múltiplos pulsos: potencialidades e aplicações

Santos¹,

Gimenes²,

Richter³

et al. 2011

Quím. Nova

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Recebido em 29/11/10; aceito em 15/3/11; publicado na web em 5/5/11 FLOW INJECTION ANALYSIS WITH MULTIPLE PULSE AMPEROMETRIC DETECTION: POTENTIALITIES AND APPLICATIONS. The potentialities and applications of the Multiple Pulse Amperometric detection (MPA) coupled with Flow Injection Analysis (FIA) are evaluated. Important aspects as cleaning and activation of electrode surface, indirect and simultaneous analysis of electroactive compounds and the use of the internal standard method for quantifications utilizing FIA-MPA are presented. The main parameters concerning the detection of electroactive analytes by multiple pulse amperometric detection in flowing solutions were also discussed. In addition, aspects such as flow rate, sample volume, application time of the potential pulses and instrumentation necessary for implementing of the method were also addressed.Keywords: electrochemical detection; multiple pulse amperometry; flow injection analysis. INTRODUÇÃOO desenvolvimento de métodos analíticos que combinam menor tempo de análise, maior sensibilidade e seletividade, simplicidade de manuseio, baixo custo e potencialidade adequada para automação constitui-se num campo de pesquisa amplo e em constante expansão na área de Química Analítica. Nesse contexto, a análise por injeção em fluxo, FIA -Flow Injection Analysis, tem sido explorada com sucesso na análise de grande diversidade de substâncias, proporcionando várias vantagens, tais como, uso de instrumentação versátil, baixo custo dos componentes do sistema, elevada frequência de amostragem, consumo reduzido de reagentes e amostras e, consequentemente, redução na geração de resíduos. 1-7 Além disto, o sistema FIA pode ser automatizado, minimizando os riscos de intoxicação do analista devido a uma menor exposição aos reagentes e amostras em comparação aos procedimentos manuais. Os primeiros trabalhos empregando FIA foram propostos por Rüzicka e Hansen, em 1975, como um novo conceito de análises químicas. 8,9 No primeiro artigo, os autores descrevem o sistema FIA acoplado a detectores de absorção molecular. 8 Três anos depois, os mesmos autores fazem uma revisão sobre os dez trabalhos que haviam desenvolvido anteriormente, abordando a teoria e as tendências da técnica. 9 Posteriormente, uma diversidade de técnicas foram exploradas, cabendo destacar a absorção atômica, 10,11 fluorescência, 12,13 quimiluminescência, 14,15 potenciometria, 16,17 voltametria, 18,19 amperometria, 20,21 entre outros.A detecção eletroquímica pode oferecer vantagens frente a outros sistemas de detecção, como baixo custo de instrumentação, simplicidade de aplicação e minimização de etapas de preparação de amostras. 3,[22][23][24][25] Adicionalmente, diversas espécies a serem analisadas podem ser pré-concentradas sobre eletrodos, tanto por processos de adsorção como por eletrodeposição. Os detectores eletroquímicos mais utilizados em sistemas em fluxo são os amperométricos, que foram adotados em grande parte dos trabalhos descritos na literatura. 3 Nesta técnica, o eletrodo de trabalho (ou se...

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“…[10][11][12][13][14][15] Most of these techniques are expensive and indirect, handling of them needs highly trained technicians and sophisticated instruments. Therefore, developing novel and simple analytical methods which are sensitive, selective, and low cost for nitrate determination is needed.…”

Section: Introductionmentioning

confidence: 99%

Developing a novel paper-based enzymatic biosensor assisted by digital image processing and first-order multivariate calibration for rapid determination of nitrate in food samples

2018

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For the first time, a novel analytical method based on a paper based enzymatic biosensor assisted by digital image processing and first-order multivariate calibration has been reported for rapid determination of nitrate in food samples. The platform of the biosensor includes a piece of Whatman filter paper impregnated with Griess reagent (3-nitroaniline, 1-naphthylamine and hydrochloric acid) and nitrate reductase. After dropping a distinct volume of nitrate solution onto the biosensor surface, nitrate reductase selectively reduces nitrate to nitrite and then the Griess reagent selectively reacts with nitrite to produce a red colored azo dye. Therefore, the color intensity of the produced azo dye is correlated with nitrate concentration. After image capture, the images were processed and digitized in the MATLAB environment by the use of an image processing toolbox and the vectors produced by the digital image processing step were used as inputs of the first-order multivariate calibration algorithms. Several multivariate calibration algorithms and pre-processing techniques have been used to build multivariate calibration models for verifying which technique offers the best predictions towards nitrate concentrations in synthetic samples and the best algorithm has been chosen for nitrate determination in potato, onion, carrot, cabbage and lettuce samples as real cases.

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Simultaneous electrochemical determination of nitrate and nitrite in aqueous solution using Ag-doped zeolite-expanded graphite-epoxy electrode

Cited by 94 publications

References 36 publications

Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate

Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate

Análise por injeção em fluxo com detecção amperométrica de múltiplos pulsos: potencialidades e aplicações

Developing a novel paper-based enzymatic biosensor assisted by digital image processing and first-order multivariate calibration for rapid determination of nitrate in food samples

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