Periodically interrupted amperometry at membrane coated electrodes: A simplified pulsed amperometry

Anikó Takátsy, Balázs Csóka, Lívia Nagy, Géza Nagy

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Amperometric detection combined with separation technique or with selective molecular recognition step can be very effective solving quantitative analytical tasks. When the amperometric working electrode surface needs cleaning or reactivation, pulsed amperometric technique can be the choice. Coating working electrodes with different sensitizing or protecting layer is quite common in the practice of voltammetric analysis. In these studies the behavior of coated electrodes using a simplified pulsed amperometric working program which can be named periodically interrupted amperometric (PIA) detection has been investigated. Rotating platinum, and carbon paste electrodes coated with dialysis film or porcine intestinal membrane were used in the experiments. The signal in case of electrochemical oxidation of hydrogen peroxide and ascorbic acid at convective conditions has been evaluated. The signal, obtained with conventional amperometry has been compared with signal collected with a periodically interrupted amperometric measuring program, allowing time for the diffusion to reload the diffusion layer at the electrode surface. The sensitivity and the lower limit of detection (4.5 × 10-7 M for ascorbic acid and 2 × 10-6 M for H2O2) proved superior in case of the periodically interrupted amperometry.

Original languageEnglish
Pages (from-to)281-285
Number of pages5
JournalTalanta
Volume69
Issue number1
DOIs
Publication statusPublished - Mar 15 2006

Keywords

  • Ascorbic acid
  • Hydrogen peroxide
  • Lower detection limit
  • Pulsed amperometry
  • Sensitivity

ASJC Scopus subject areas

  • Analytical Chemistry

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