Métodos para fabricação de microeletrodos visando a detecção em microambientes

Paixão, Thiago R.L.C.; Bertotti, Mauro

doi:10.1590/s0100-40422009000500037

Cited by 17 publications

(19 citation statements)

References 82 publications

(102 reference statements)

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“…The microelectrode was left to dry for about 3 hours and then its surface was polished with sandpaper and alumina, followed by copious washing with distilled water. The radius of the electrode was calculated by measuring the limiting diffusion current in a solution of K 3 Fe(CN) 6 of known concentration using KCl as supporting electrolyte [2].…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, the determination of metallic ions at low levels can be conveniently performed by using electroanalytical techniques, especially when preconcentration strategies (stripping methods) are used to enhance the sensitivity of the measurements [1]. If experiments are carried out with microelectrodes, lower detection limits can be obtained owing to the enhanced mass-transport regime and reduced capacitive effects [2,3]. Moreover, the precision of the measurements is greatly increased as solution stirring is unnecessary during the pre-concentration step.…”

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confidence: 99%

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Determination of Dissolved Zn(II) and Cd(II) in Estuarine Water by Using a Bismuth Film Microelectrode

Souza¹,

Salles²,

Braga³

et al. 2011

Electroanalysis

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A bismuth-film electrode was employed to quantify Cd(II) and Zn(II) in estuarine water samples by anodic stripping voltammetry. The bismuth film was deposited in situ simultaneously with the analytes onto a carbon fibre disc microelectrode (radius = 3 mm). Under the optimised conditions, calibration plots for both metallic ions were obtained in the range from 0.5 to 10.0 nmol L À1 and the limits of detection for Cd(II) and Zn(II) were estimated as 0.03 and 0.8 nmol L À1 , respectively. The accuracy of the results supplied by the bismuth film microelectrode (BiFME) was assessed by performing addition-recovery experiments and by comparing values with those obtained with a certified sample. The usefulness of the methodology was demonstrated by applying the BiFME to measuring the Cd(II) and Zn(II) content in estuarine water. The determination of metallic ions at very low levels and the continuous monitoring of the concentration of these bioavailable ions in estuarine water are extremely important. The quantification of heavy metals along the water system requires the use of sensitive analytical techniques, hence allowing the recognition and the distinction between the concentrations determined for the assessment of environmental quality. The methods routinely used in environmental studies depend mainly on spectroscopic measurements, which sometimes do not allow the quantification of trace concentrations. On the other hand, the determination of metallic ions at low levels can be conveniently performed by using electroanalytical techniques, especially when preconcentration strategies (stripping methods) are used to enhance the sensitivity of the measurements [1]. If experiments are carried out with microelectrodes, lower detection limits can be obtained owing to the enhanced mass-transport regime and reduced capacitive effects [2,3]. Moreover, the precision of the measurements is greatly increased as solution stirring is unnecessary during the pre-concentration step. This approach is very useful for the determination of metals in oceanic systems, as natural levels of heavy metals are in the order of nmol L À1

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Determination of Dissolved Zn(II) and Cd(II) in Estuarine Water by Using a Bismuth Film Microelectrode

Souza¹,

Salles²,

Braga³

et al. 2011

Electroanalysis

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“…Esta fibra foi posicionada no interior da pipeta de Pasteur e então fixada com a resina epóxi Araldite. Para a secagem da resina, a pipeta foi deixada em posição vertical, para melhorar o posicionamento da fibra [3].…”

Section: Microeletrodosunclassified

“…O eficiente processo difusional possibilita o rápido transporte das espécies eletroativas à superfície do eletrodo e, consequentemente, há pouca interferência de efeitos hidrodinâmicos sobre o sinal de corrente [3].…”

Section: Introductionunclassified

Uso de eletrodos de cobre e eletrodos modificados como sensores eletroquímicos

Dantas¹

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“…Nesse sentido, microeletrodos podem ser definidos de maneira mais abrangente como qualquer eletrodo cuja dimensão, dentro de uma dada condição experimental, seja comparável ou menor que a da camada de difusão (CHING; DUDEK; TABET, 1994;PAIXÃO;BERTOTTI, 2009 Desta forma, a resposta de corrente decorrente da alteração do potencial para valor em que o processo de eletrodo é governado por difusão é determinada pela seguinte equação:…”

Section: Microeletrodosunclassified

Estudo da ação de íons cloreto no processo de corrosão por pite utilizando microscopia eletroquímica de varredura

Silva¹

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AgradecimentosAos meus pais por me ajudarem e apoiarem em toda essa aventura acadêmica.À minha namorada Ana por me apoiar e aturar todas as conversas insuportáveis sobre química.Ao professor Mauro Bertotti por toda orientação e por ter aceitado enfrentar esse projeto comigo.Aos professores Paulo Teng (in memorian) e Roberto Torresi pela paciência e aprendizado passado durante a qualificação que muito contribuiu neste trabalho.Aos professores Thiago Paixão, Ivano Gutz, Silvia Agostinho, Silvia Serrano, Lucio Angnes, Claudimir Lago e Paulo Celso pelas excelentes aulas que aumentaram meu interesse pela química.Aos professores Idalina Aoki e Hercilio de Melo por todo auxilio durante a construção deste trabalho.Aos amigos de LSEME por terem contribuído em animar todo meu processo de aprendizado. Principalmente ao Dr. Alex Lima, Carla Santana e Gabriel Meloni por todo companheirismo.Aos amigos Maiara Salles, Thiago Ferreira, Helena Junqueira, Juliana Naozuka, André Oliveira e membros do L2ESQ e do LAIA por todas as conversas tanto acadêmicas quanto informais e momentos de descontração.Ao amigo Ciro Quintans por partilhar a experiência de fazer o mestrado longe da nossa zona de conforto e pela paciência de ler este trabalho, apesar de estar do outro lado do mundo.Ao amigo Rafael Milléo por estar sempre presente e ter ajudado a melhorar o alcance do trabalho feito no LSEME.

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Métodos para fabricação de microeletrodos visando a detecção em microambientes

Cited by 17 publications

References 82 publications

Determination of Dissolved Zn(II) and Cd(II) in Estuarine Water by Using a Bismuth Film Microelectrode

Determination of Dissolved Zn(II) and Cd(II) in Estuarine Water by Using a Bismuth Film Microelectrode

Uso de eletrodos de cobre e eletrodos modificados como sensores eletroquímicos

Estudo da ação de íons cloreto no processo de corrosão por pite utilizando microscopia eletroquímica de varredura

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