Method for detecting chemical substances

Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For properties of solid material

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204418, 205792, 2057945, G01N 2726

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active

054964512

ABSTRACT:
On the bottom face of a measurement section, measurement electrodes and a reference electrode are formed and a solution supply pipe is opened. Then, if a predetermined electrolytic solution is supplied from the solution supply pipe, the electrolytic solution can be held on an electrolytic solution holding surface on the lower end of the measurement section, utilizing the surface tension thereof for providing a gas reception portion. Since the electrolytic solution is exposed directly to the air, substances in a vapor phase (particularly, odor substances) are diffused into the electrolytic solution, causing an electric state to change. The substances in the vapor phase can be detected by detecting the electric state change. The electrolytic solution held on the lower face of the measurement section can be updated by further supplying more electrolytic solution.

REFERENCES:
patent: 3824168 (1974-07-01), Oswin et al.
patent: 5239258 (1993-08-01), Kauffman
Slater, Jonathan, M., et al. "Examination of Ammonia-Poly(pyrrole) Interactions by Piezoelectric and Conductivity Measurements", Analyst, Nov. 1991, vol. 116, pp. 1125-1131.
Slater, Jonathan, M., et al. "Gas and Vapour Detection With Poly(pyrrole) Gas Sensors", Analyst, Aug. 1992, vol. 117, pp. 1265-1271.
Slater, Jonathan, M., et al. "Multi-layer Conducting Polymer Gas Sensor Arrays for Olfactory Sensing", Analyst, Apr. 1993, vol. 118, pp. 379-384.
Hartnett, Margaret, et al., "Detector Based on Charge Coupled Device Technology", Analytical Proceedings, Feb. 1992, vol. 29, pp. 52-57.

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