초록 ▼

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 electrochem

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.

대표청구항 ▼

A method for detecting a gas, vapor, chemical pollutant or other component of interest in a gaseous medium said method comprising: exposing a noble metal-containing catalytic surface of an electrical heating element to a sample gaseous medium including a component of interest so as to heat the compo

A method for detecting a gas, vapor, chemical pollutant or other component of interest in a gaseous medium said method comprising: exposing a noble metal-containing catalytic surface of an electrical heating element to a sample gaseous medium including a component of interest so as to heat the component and catalytically produce a product which is not heat and which is a derivative chemical product of said component not present in said sample gaseous medium, the derivative chemical product having a characteristic electrochemical activity capable of causing an electrochemical sensor to produce a corresponding electrical output signal, and determining the amount of the component of interest in the original sample gaseous medium by determining electrochemically, using an electrochemical sensor and based on the electrochemical activity of the derivative chemical product sensed by said electrochemical sensor, the amount of the derivative chemical product produced as the derivative chemical product leaves said heating element.