✦ LIBER ✦
A carbon dioxide air-gap microelectrode based on a neutral hydrogen ion exchanger pH microelectrode
✍ Scribed by Yilong Ma
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 360 KB
- Volume
- 186
- Category
- Article
- ISSN
- 0003-2697
No coin nor oath required. For personal study only.
✦ Synopsis
A relatively simple potentiometric pCO2 gas-sensing microelectrode is described. It is based on an ion-exchanger pH electrode, has a 2- to 5-microns tip, and has an air gap which is formed by means of hydrophobic treatments. The microelectrode exhibits a linear response in the range 10(-4)-10(-2) M with a Nernstian slope of 59 to 62 mV/decade at 25 degrees C. Ninety-five percent of the steady-state response time is about 20-30 s at the flow system when the concentration of sodium bicarbonate in buffer solution (pH 4.5) suddenly shifts from 0.2 to 2 mM and the lifetime is longer than 1 week.