Colorimetric testing and measuring device for gases

Details Colorimetric testing and measuring device for gases Colorimetric testing and measuring device for gases

G - Physics

01

N

G01N 21/78 (2006.01) G01N 31/22 (2006.01)

Patent

CA 2072522

An improved measuring apparatus for the colorimetric indication of gases is disclosed. The apparatus comprises a carrier that is impregnated with a solution of a moisture retainer and a detection indicator. A mixture of sulfolane and diethylphthalate is used as the moisture retainer. To measure hydride gases, such as arsine or phosphine, the indicator con- sists of palladium tetramine chloride. The impregnating solution may be applied to a paper carrier or to a granular silica gel carrier. Due to the presence of the moisture retainer, the moisture required for the indicating reaction remains on the indicator carrier for a longer period of time, both during stor- age of the device and during measurements, when the carrier is exposed to the gaseous substance that is to be indicated.

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