potentiometric gas sensor

https://doi.org/10.1351/goldbook.09123
Ion-selective electrode cell that is responsive to an analyte gas.
Notes:
  1. The ion-selective membrane of the gas sensor is in contact with a thin film of solution that is separated from the bulk of the sample solution by a gas-permeable membrane or an air gap. This intermediate solution interacts with the analyte gas that penetrates through the membrane or air gap, which results in a change of a measured constituent (e.g., HA+ activity) of the intermediate solution. This change is then sensed by the ion-selective electrode and is related to the partial pressure of the gaseous species in the sample.
  2. These electrodes respond both to the partial pressure of the gas (HA2 or ClA2) and to the ionic activities of related species (HA+ or ClA−).
  3. In electrochemical literature the term ‘gas electrode’ includes potentiometric gas sensors and the classical, redox-equilibrium-based gas electrodes, such as the hydrogen electrode: Pt(s)|HA2(g)|HA+(aq).
Source:
PAC, 2020, 92, 641. (Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)) on page 666 [Terms] [Paper]
Citation: 'potentiometric gas sensor' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.09123 RIS BibTex EndNote
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