Method for detecting toxic gases

Details Method for detecting toxic gases Method for detecting toxic gases

1990-03-23

1991-10-08

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

422 94, 422 95, 422 98, 436106, 436109, 436120, 436122, 436124, 436155, 436159, 2041531, 204400, 204431, 73 2331, 73 2501, G01N 2700, G01N 3112, G01N 2716, G01N 2522

Patent

active

050552660

ABSTRACT:
A method capable of detecting low concentrations of a pollutant or other component in air or other gas, utilizing a combination of a heating filament having a catalytic surface of a noble metal for exposure to the gas and producing a derivative chemical product from the component, and an electrochemical sensor responsive to the derivative chemical product for providing a signal indicative of the product. At concentrations in the order of about 1-100 ppm of tetrachloroethylene, neither the heating filament nor the electrochemical sensor is individually capable of sensing the pollutant. In the combination, the heating filament converts the benzyl chloride to one or more derivative chemical products which may be detected by the electrochemical sensor.

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