Which chemical reaction occurs within the Stow-Severinghaus electrode?
a. CO2 + H2O ? H2CO3 ? H+ + HCO3–
b. O2 + 2H2O + 4e– ? 4OH–
c. 4Ag ? 4Ag+ + 4e–
d. EH+ = 0.0615 ? pH
ANS: A
The Stow-Severinghaus electrode is the standard PCO2 electrode. Within the electrode, CO2 from the blood diffuses across the Teflon membrane and reacts with water to form carbonic acid, which dissociates into hydrogen ions and bicarbonate. The reaction can be written as CO2 + H2O → H2CO3 → H+ + HCO3–. The hydrogen ions from the bicarbonate-buffered solution then diffuse across the glass electrode, and the pH of the solution is measured as it is in the pH electrode.
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