| 摘要 |
<p>A miniature probe measures instantaneously the pH value of a fluid and the partial pressure of CO2 by interposing between a semi-permeable membrane and the glass diaphragm a slightly alkaline solution. The reference electrode disposed behind a pH sensitive glass diaphragm may be a capillary tube of glass or plastics, containing a solution together with a chlorinated Ag wire. The electrode is connected to the probe through a saline bridge. The diaphragm may be a thin sheet of PTFE. The partial pressure of CO2 is measured from the pH of an NaHCO3 solution with which it is in equilibrium.</p> |
