XPS analysis of glassy carbon electrodes chemically modified with 8-hydroxyquinoline-5-sulphonic acid
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Spectrophotometric Determination of Tantalum(V) with 5-Iodo-8- -hydroxyquinoline-7-sulphonic Acid
Tantalum(V) reacts with 5-iodo-8-hydroxyquinoline-7-sulphonic acid to form a yellowish coloured complex having maximum absorbance at 405 nm in citric acid medium. The relatively slow reaction at room temperature is completed in 10 minutes at 40 °c. The colour is stable for at least 12 hr. Effects of heating temperature, time, pH, reagent concentration and other variables have been studied. The ...
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A micellar liquid-chromatographic method is proposed for determination of Al(III) as the 8-hydroxyquinoline-5-sulfonic acid derivative, with spectrofluorimetric detection. Cetyltrimethylammonium bromide, a cationic surfactant (0.05 M), was used as mobile phase. The metal chelate was detected at λEx 410 and λEm 510 nm. Response to aluminum is selective in the presence of other metal ions. The me...
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Multiwalled carbon nanotubes were used to modify the surface of a glassy carbon electrode to enhance its electroactivity. Nafion served to immobilise the carbon nanotubes on the electrode surface. The modified electrode was used to develop an analytical method for the analysis of ascorbic acid (AA) by square-wave voltammetry (SWV). The oxidation of ascorbic acid at the modified glassy carbon el...
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Um filme eletroativo fino, de pentacianonitrosilferrato de cobalto (CoPCNF), foi eletrodepositado em um eletrodo de carbono vítreo por voltametria cíclica. O eletrodo modificado exibe boa atividade eletrocatalítica frente à oxidação de tiossulfato. A oxidação eletrocatalítica de tiossulfato em eletrodo de carbono modificado com CoPCNF, como um eletrodo de trabalho, tem sido estudada usando-se v...
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ژورنال
عنوان ژورنال: Surface and Interface Analysis
سال: 2011
ISSN: 0142-2421
DOI: 10.1002/sia.3880