| 摘要 |
1,204,298. Electro-chemical analysis. H. LIST. April 24, 1969, [April 30, 1968], No.20918/69. Heading G1N. Micro-analysis apparatus for pH, O 2 and CO 2 in blood comprises a capillary 3 housed in a glass cylinder 2 containing liquid temperature controlled to body heat. Conical apertures 5, (of which only two are shown) are provided for introducing measuring electrodes for pH, O 2 , and CO 2 , and a reference electrode. A switchover cock 6 is mounted in a conical seating 4 at one end of the capillary to apply (i) suction or pressure to oscillate the sample over the electrodes and (ii) a supply of CO 2 to bubble through the sample in a mixing hopper 9 which can be inserted in a conical inlet 4, during equilibration. In use the apparatus is first flushed with distilled water and dried, then moist calibration gas is passed through the capillary. Next the sample is inserted through inlet 4, and readings of pH, O 2 and CO 2 are recorded. Then gas with a known CO 2 content is bubbled through the sample so that it assumes the same CO 2 content (i.e. partial pressure), and further readings are taken to determine the CO 2 /pH value function. |
