Pulsed electrochemical detection of H2O2 on gold

Gerlache, Marc; Girousi, Stella; Quarin, Guy Charles; Kauffmann, J.M.

doi:10.1016/s0013-4686(98)00093-0

Cited by 36 publications

(24 citation statements)

References 32 publications

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“…Conversely, both peak shape and peak potential observed at Au electrodes for this anodic process were scarcely reproducible, conceivably because gold surface undergoes progressive fouling in the presence of H 2 O 2 (thus losing its activity), as reported elsewhere [18,28]. A satisfactory maintenance of reproducibility could be instead achieved by adopting a cleaning procedure for gold surfaces based on an electrochemical multiscan sequence (usually, no more than 10 scans) at 0.1 Vs À1 between negative ( À 0.7 V) and positive potentials (1.5 V), which resembles closely the procedure suggested previously for H 2 O 2 detection in neutral media [28].…”

Section: Apparatus and Proceduresmentioning

confidence: 71%

Simultaneous Detection of Peracetic Acid and Hydrogen Peroxide by Amperometry at Pt and Au Electrodes

et al. 2006

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Based on preliminary voltammetric investigations at both Pt and Au electrodes in aqueous solutions buffered at different pH values in the range 0 -10, two possible profitable triple-pulse amperometric approaches were developed for determining simultaneously peroxyacetic acid (PAA) and hydrogen peroxide present in the same samples. At both surfaces a pulsed waveform applied at rotating-disc electrodes was adopted to take advantage on one hand of the optimized signal reproducibility achieved by this potential multistep antifouling approach and on the other hand of the constant thickness of the diffusion layer, which is necessary when the recording of time-independent currents is desired. At a rotating-disc Pt electrode an anodic selective signal was indeed recorded for H 2 O 2 alone, while PAA contents could be inferred only from the difference of convenient signals, since at all pHs explored its sole cathodic reaction could be observed at potentials coincident with those proper for the reduction of H 2 O 2 too. The same pulse approach at Au electrodes instead provided totally independent signals for the two analytes considered, thus proving to be suitable for their independent detection. In fact, H 2 O 2 alone undergoes anodic oxidation also at this surface, while the reduction of PAA occurs at potentials less cathodic than those required for H 2 O 2 . At both electrodes, the best results turned out to be achieved at pH 0 in terms of both precision (AE 2 -4%) and detection limits (0.2 -0.3 mM), as well as of linear range which extended for about three orders of magnitude. The kinetics of the equilibrium involving the generation of H 2 O 2 from the reaction of PAA with water was also evaluated, since it was suspected of making unreliable the proposed amperometric approaches.

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Section: Apparatus and Proceduresmentioning

confidence: 71%

Simultaneous Detection of Peracetic Acid and Hydrogen Peroxide by Amperometry at Pt and Au Electrodes

et al. 2006

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“…Here, it should be stressed that the in situ electrochemical pretreatment of the gold electrode is very useful to obtain the reproducible data. That is, prior to each measurement in each PAA + H 2 O 2 solution, the electrode potential was one time scanned at 100 mV s −1 from 1.5-1.0 V and then to 1.5 V. A multi-scan of potential was needed for obtaining A similar procedure to clean the surface state of gold electrode has been pointed out by Gerlache et al in detecting H 2 O 2 in neutral aqueous media [39].…”

Section: Square Wave Voltammetrymentioning

confidence: 99%

Fractional determination of peracetic acid and hydrogen peroxide at deposited gold enriched in the Au(1 1 1) domain

Awad

Ohsaka

2015

Sensors and Actuators B: Chemical

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“…67 Adicionalmente, foram publicados artigos de revisão que tratam da detecção eletroquímica de uma forma geral, contendo um tópico dedicado à amperometria pulsada. 23,42,43,61,[68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83] Estes trabalhos apresentam uma ampla revisão sobre aplicações da PAD ou MPA em procedimentos em batelada, eletroforese capilar e cromatografia líquida. No entanto, poucos trabalhos relatam o uso da MPA na análise simultânea ou indireta de analitos eletroativos empregando FIA.…”

Section: Limpeza E Ativação Da Superfície Do Eletrodo Através Da Mpaunclassified

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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Pulsed electrochemical detection of H2O2 on gold

Cited by 36 publications

References 32 publications

Simultaneous Detection of Peracetic Acid and Hydrogen Peroxide by Amperometry at Pt and Au Electrodes

Simultaneous Detection of Peracetic Acid and Hydrogen Peroxide by Amperometry at Pt and Au Electrodes

Fractional determination of peracetic acid and hydrogen peroxide at deposited gold enriched in the Au(1 1 1) domain

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

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