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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)122-128
Number of pages7
JournalAnalytica Chimica Acta
Volume308
Issue number1-3
DOIs
Publication statusPublished - 9 Jun 1995

Keywords

  • Flow injection
  • Ion selective electrodes
  • Picrate
  • Sugar
  • Wine

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