Comparative study of potentiometric and amperometric tissue-based electrodes for oxalate

Tekum Fonong

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Acetone-precipitated pulp from banana skins is physicall entrapped at the tip of a carbon dioxide gas-sensor and on a hydrogen peroxide sensor probe to determine oxalate potentiometrically and amperometrically in aqueous solution and inurine. The enzyme present in the tissue is oxalate oxidase. The potentiometric response has a slope of 47-50 mV/decade for 1 × 10-4 M-2 × 10-3 M oxalate with a detection limit of 2 × 10-5 M. The amperometric response is linear for 2 × 10t-5-3 × 10-4 M oxalate with a dectection limit of 2 × 10-6 M. Average recoveries of oxalate added to aqueous samples were 96.2% and 98.0%, and average relative standrd deviations were 3.8% and 3.6% for the potentiometric and amperometric systems, respectively. Oxalate was determined in six control urine samples, with relative errors of about 2.5%, by both electrode systems after a simple clean-up.

Original languageEnglish (US)
Pages (from-to)301-305
Number of pages5
JournalAnalytica Chimica Acta
Issue numberC
StatePublished - 1986

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy


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