Construction and use of a tubular picrate ion-selective electrode for reducing sugar determination in Port wine by flow-injection analysis

Teresa I. M. S. Lopes, António O. S. S. Rangel*, JoséL L. F. C. Lima, M. Conceição B. S. M. Montenegro

*Autor correspondente para este trabalho

Resultado de pesquisarevisão de pares

21 Citações (Scopus)
6 Transferências (Pure)

Resumo

A picrate ion-selective electrode without inner reference solution and based on bis(triphenylphosphoranylidene)ammonium picrate dissolved in 2-nitrophenyloctyl ether was constructed and its characteristics assessed. With respect to reducing sugar determination in Port wine, a tubular electrode based on the same sensor system was developed and incorporated into a flow-injection manifold devised for this determination. The methodology involves a reaction between the reducing sugar and picric acid, the decrease in the picrate concentration being monitored with the tubular electrode. A linear dependence between peak width, at a fixed potential and the logarithm of sugar concentration in the range 25-200 g l-1 was obtained. The proposed system allows wine samples to be injected with no previous treatment and allows a sample throughput of 50 determinations per hour, a relative standard deviation less than 4%, and the results are comparable to the reference procedures.

Idioma originalEnglish
Páginas (de-até)122-128
Número de páginas7
RevistaAnalytica Chimica Acta
Volume308
Número de emissão1-3
DOIs
Estado da publicaçãoPublicado - 9 jun. 1995

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