Method of detecting carbon dioxide gas

Details Method of detecting carbon dioxide gas Method of detecting carbon dioxide gas

1986-05-16

1988-07-05

Marcus, Michael S.

Chemistry: analytical and immunological testing

Oxygen containing

Inorganic carbon compounds

436151, 422 98, 73 23, 733365, G01N 2712

Patent

active

047554738

ABSTRACT:
The presence of carbon dioxide contained in a gas can be detected through measurement of the change in the electrical resistance of a hydroxyapatite in contact with carbon dioxide gas. The sensitivity of the hydroxyapatite to carbon dioxide gas can be enhanced by the formation of a composite of the hydroxyapatite with an inorganic carbonate, e.g., sodium carbonate or calcium carbonate. The sensitivity to carbon dioxide gas can be further enhanced by the formation of a composite of the hydroxyapatite with an inorganic halide, e.g., calcium chloride.

REFERENCES:
patent: 4419889 (1983-12-01), Muto et al.
Nagai et al., Complex Impedance Behavior of Porous Hydroxyapatite Ceramics, Ceramics Association Annual Meeting, Preliminary Publication, 411 (1985).

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