Severinghaus electrode

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The Severinghaus electrode is an electrode that measures carbon dioxide (CO2). It was developed by Dr. John W. Severinghaus and his technician A. Freeman Bradley in 1958.[1]

It utilizes a CO2-sensitive glass electrode in a surrounding film of bicarbonate solution covered by a thin plastic carbon dioxide permeable membrane, but impermeable to water and electrolytic solutes. The carbon dioxide pressure of a sample gas or liquid equilibrates through the membrane and the glass electrode measures the resulting pH of the bicarbonate solution.

Clark, galvanic, and paramagnetic electrodes measure oxygen.  Severinghaus electrode measures CO2.  Sanz electrode measures pH.[2]

## References

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1. ^ Severinghaus, John W.; Bradley, A. Freeman (1958). "Electrodes for Blood pO2 and pCO2 Determination". Journal of Applied Physiology. 13 (3). American Physiological Society: 515–520\. doi:10.1152/jappl.1958.13.3.515. ISSN 8750-7587. PMID 13587443.
2. ^ McFadyen, J.G (1 December 2008). "Respiratory Gas Analysis" (PDF). World Federation of Societies of Anaesthesiologists. Archived from the original (PDF) on 15 February 2010. Retrieved 14 September 2020.

## External links

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* Editorial, Anaesthesia UK (3 April 2006). "Anaesthesia UK : Measurement of pO2, pCO2, pH, pulse oximetry and capnography". Anaesthesia UK.

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