Scientific article

Thin Layer Coulometry of Nitrite with Ion-Selective Membranes

Published inElectroanalysis, vol. 27, no. 3, p. 609-615
Publication date2015

We report on a thin layer coulometric detection method based on an ion-selective membrane in view of a quantitative determination of nitrite in undiluted human urine and tap water. A cobalt(II) tert-butyl salophen compound, previously characterized by our group in ion-selective membrane electrodes, is used here as ionophore. The four orders of magnitude discrimination of chloride permits the detection of nitrite in samples that contain a large excess of chloride. The approach developed here allows one to determine nitrite within a concentration range of 20–100 µM for a 120 s current integration time. A modification of the reported electrochemical protocol to reduce the capacitive contribution diminishes the intercept of the calibration to −8.6 µC. This is especially important in view of reaching calibration free systems. Initial in-house validation exhibits a limit of detection of 10 µM in undiluted urine and in tap water. These values correspond to the regulation limits established in European Union and are adequate for the determination of nitrite for medical applications.

  • Thin layer coulometry
  • Ion-selective membranes
  • Nitrite detection
  • Universal detection systems
  • Urine analysis
  • Salophen
Research group
Citation (ISO format)
GHAHRAMAN AFSHAR, Majid et al. Thin Layer Coulometry of Nitrite with Ion-Selective Membranes. In: Electroanalysis, 2015, vol. 27, n° 3, p. 609–615. doi: 10.1002/elan.201400522
Main files (1)
Article (Published version)
ISSN of the journal1040-0397

Technical informations

Creation10/09/2015 2:06:00 PM
First validation10/09/2015 2:06:00 PM
Update time03/14/2023 11:41:43 PM
Status update03/14/2023 11:41:43 PM
Last indexation10/18/2023 11:51:22 PM
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