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CO2 & NH3
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| PowerLab can record dissolved carbon dioxide and/or ammonia concentrations with a suitable gas sensing electrode.
Gas sensing electrodes typically work by allowing carbon dioxide (or ammonia) to diffuse across a permeable plastic membrane into the inner compartment of the electrode where they reversibly react with a buffer solution and in doing so alter the pH that the electrode senses. The electrodes are connected to standard pH meters or can be used with the ADInstruments pH Amp (ML165) which can also be used if a separate reference electrode is necessary.
Electrodes and meters made by Microelectrodes Inc, Diamond General and Thermo Orion are suitable.
Transcutaneous carbon dioxide (TCpCO2) can be monitored by using skin electrodes. An approved electrically isolated meter must be used for human use. These meters can sometimes also monitor transcutaneous oygen levels. Manufacturers of these types of meters include Radiometer, SensorMedics, and Perimed.
The electrodes are usually calibrated using the Units Conversion feature of the LabChart software.
Ask your nearest ADInstruments representative for more information.
See also the Gas Analysis page for CO2 measurements in air. |
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| PowerLab (MacLab) citations: |
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| Transcutaneous PCO2 monitoring in the evaluation of hyperventilation of patients with recurrent nerve paralysis. |
| H. Miyazaki, H. Yamashita, T. Masuda, T. Yamamoto, S. Komiyama, European Archives of Oto-Rhino-Laryngology, 256, S47-S50, 1999. |
| Transcutaneous (TC) PCO2 and PO2 were analyzed during phonation in patients with known recurrent nerve paralyses (RNP). |
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| Sleep-Disordered Breathing and School Performance in Children. |
| David Gozal, Pediatrics, 102, 616-620, 1998. |
| Children were screened for obstructive sleep apnea syndrome. Overnight recording of pulse oximetry (SpO2) and pulse signal (Nellcor N 200; Nellcor Inc, Hayeard, CA) and trancutaneous carbon dioxide tension (TcCO2); Sensor-Medics Transcend Cutaneous Gas System (SensorMedics, Yorba Linda, CA); at home. Analog signals were digitally acquired using MacLab. Subsequent off-line analysis was performed with Igor software (WaveMetrics, Lake Oswego, OR) with cutom designed routines. |
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The material on this page is provided in good faith and believed accurate at the time of writing. No responsibility will be taken, or liability accepted, for damages arising from the use of information herein. Readers are urged to check with respective manufacturers the accuracy of all product related information.
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