Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1997-07-03
2000-11-07
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204403, 204415, G01N 2726
Patent
active
061431508
ABSTRACT:
A biological gas sensor for measuring a carbon dioxide partial pressure in an alimentary canal while excluding the influences of hydrogen sulfide and/or weak acid is disclosed. The gas sensor comprises a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution, a liquid holding part which is formed of a gas permeable tube having in the inside thereof the sensitive part of the sensor, an isotonic solution which is held in the liquid holding part and is isotonic with the bicarbonate buffer solution, and a metallic member (e.g., a coil of copper wire) so that hydrogen sulfide entering the liquid holding part may react with the metal and precipitate.
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Nagai Yuko
Nakamura Michihiro
Ono Kohei
Sekiguchi Tetsushi
Nihon Kohden Corporation
Noguerola Alex
Tung T.
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