Eletrodos íon-seletivos: histórico, mecanismo de resposta, seletividade e revisão dos conceitos

Fernandes, Julio Cesar B.; Kubota, Lauro T.; Neto, Graciliano de Oliveira

doi:10.1590/s0100-40422001000100020

Cited by 16 publications

(15 citation statements)

References 57 publications

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“…Ion selective electrodes (ISEs) belong to the oldest established chemical sensors. Their response characteristics including selectivities, kinetic process and basic thermodynamic process [10,[250][251][252][253][254][255][256][257] are comparatively well understood. ISEs are mainly membranebased devices, consisting of permselective ion-conducting materials, which separate the sample from the inside of the electrode.…”

Section: Ion-selective Electrodesmentioning

confidence: 99%

“…On the inside is a filling solution containing the ion of interest at a constant activity. The membrane is usually water insoluble, nonporous and mechanically stable [10,[250][251][252][253][254][255][256][257][258][259][260][261]. ISEs membranes always contain a substantial concentration of the primary ion salt, which is typically in the mM range.…”

Section: Ion-selective Electrodesmentioning

confidence: 99%

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Solid Electrodes in Electroanalytical Chemistry: Present Applications and Prospects for High Throughput Screening of Drug Compounds

Uslu

Özkan²

2007

CCHTS

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This review summarizes recent progress in the development and application of solid electrodes to the screening of pharmaceutical dosage forms and biological fluids. Recent trends and advances in the electroanalytical chemistry of solid electrodes, microelectrodes and electrochemical sensors are reviewed. The varieties of solid electrodes and their basic physico-chemical properties and some specific characteristics including some supramolecular phenomena at their surface are surveyed. This review also includes some selected designs and their applications. Despite many reviews about individual solid electrodes in the literature, this review offers the first comprehensive report on all forms of solid electrodes. Special attention is paid to the possibilities of solid electrodes in high throughput electroanalytical investigation of drug dosage forms and biological samples using modern electroanalytical techniques. Various selected studies on these subjects since 1996 are reviewed in this paper.

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Section: Ion-selective Electrodesmentioning

confidence: 99%

Section: Ion-selective Electrodesmentioning

confidence: 99%

Solid Electrodes in Electroanalytical Chemistry: Present Applications and Prospects for High Throughput Screening of Drug Compounds

Uslu

Özkan²

2007

CCHTS

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“…If only cations are adsorbed onto the membrane surface (q-= 0), results in increased potential with increasing positive charges. 28 These assumptions may indicate that the conductive polymer does not necessarily show a Nernst response.…”

Section: Resultsmentioning

confidence: 99%

Poly(o-methoxyaniline) modified electrode for detection of lithium ions

Lindino¹,

Casagrande²,

Peiter³

et al. 2012

Quím. Nova

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Recebido em 16/2/11; aceito em 12/9/11; publicado na web em 8/11/11 This paper reports the use of an electrode modified with poly(o-methoxyaniline) for detecting lithium ions. These ions are present in drugs used for treating bipolar disorder and that requires periodical monitoring of the concentration of lithium in blood serum. Poly(omethoxyaniline) was obtained electrochemically by cyclic voltammetry on the surface of a gold electrode. The results showed that the electrode modified with a conducting polymer responded to lithium ions in the concentration range of 1 x 10 -5 to 1 x 10 -4 mol L -1 . The results also confirmed that the performance of the modified electrode was comparable to that of the standard method (atomic emission spectrophotometry).

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“…Apesar de ser normalmente creditado a Beckman o lançamen-to do primeiro peagâmetro, deve-se registrar que em 1935 uma outra proposta desse aparelho foi lançada pela empresa dinamarquesa Radiometer 45,49 . O que a literatura indica claramente é que ambas as "descobertas" tiveram como inspiração o trabalho de L. W. Elder e W. H. Wright 50 , professores do Departamento de Quí-mica da Universidade de Illinois.…”

Section: A Invenção Do Medidor De Ph (Acidímetro Ou Peagâmetro)unclassified

De Svante Arrhenius ao peagâmetro digital: 100 anos de medida de acidez

Gama¹,

Afonso²

2007

Quím. Nova

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Recebido em 6/4/05; aceito em 13/1/06; publicado na web em 11/8/06 FROM SVANTE ARRHENIUS TO THE DIGITAL pH METER: A CENTURY OF ACIDITY MEASUREMENT. This work describes the establishment of the concept of pH and the evolution of its measurement. The origin of the pH definition can be found in the development of the chemistry of aqueous solutions during the XIXth century. The electrolytic dissociation theory by Svante Arrhenius played a central role. After the proposal of the pH scale by Sörensen, many years were necessary for the acceptance of this new parameter among chemists in general. Its importance was first recognized in biochemistry and related areas. Twenty years after, its importance had been recognized in many industrial and laboratorial practices. The previous methods were based on colorimetric and electrometric methods, but both suffered from many problems. Acceptance of pH in Chemistry was only possible after the development of experimental trustable measurements. The invention of the pH meter was the primordial step. Kohlrausch (1840Kohlrausch ( -1910 desenvolveu um novo método para determinar a condutividade, e com isso estabeleceu a lei da migração independente dos íons 1-3 . Svante Arrhenius (1859-1927) percebeu em sua teoria de dissociação eletrolítica (1887) que a lei da ação das massas podia ser aplicada às reações iônicas [3][4][5] . Supôs que algumas das molécu-las de um eletrólito eram dissociadas em seus íons que, por serem partículas carregadas, eram passíveis de movimento independente sob ação de um campo elétrico. Assim, calculou a pressão osmótica pela lei de Van't Hoff, elucidando o fator i. Além disso, também determinou a constante de dissociação dos ácidos e das bases, relacionando a magnitude dessa dissociação com a força do ácido ou da base. Segundo Arrhenius, ácidos são substâncias que produzem, em solução aquosa, íons hidrogênio; analogamente, bases produzem íons hidroxila em solução.Com o advento da teoria de Arrehenius e os avanços das medidas elétricas, foi possível determinar a constante de dissociação da água pura, pela aplicação da lei da ação das massas. Foi Wilhelm Ostwald (1853Ostwald ( -1932, em 1893, quem primeiro fez essa determinação, empregando uma célula de concentração 4

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Eletrodos íon-seletivos: histórico, mecanismo de resposta, seletividade e revisão dos conceitos

Cited by 16 publications

References 57 publications

Solid Electrodes in Electroanalytical Chemistry: Present Applications and Prospects for High Throughput Screening of Drug Compounds

Solid Electrodes in Electroanalytical Chemistry: Present Applications and Prospects for High Throughput Screening of Drug Compounds

Poly(o-methoxyaniline) modified electrode for detection of lithium ions

De Svante Arrhenius ao peagâmetro digital: 100 anos de medida de acidez

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