Testing element for the colorimetric determination of oxidizable components in gas mixtures
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United States of America Patent
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Feb 19, 2002
Grant Date -
N/A
app pub date -
Sep 28, 1999
filing date -
May 21, 1999
priority date (Note) -
Expired
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Abstract
A testing elements for the calorimetric determination of oxidizable gas and/or vapor components in gas mixtures is provided. The testing element contains, besides usual oxidizing agents, at least one redox indicator, which is in the oxidized form. The redox indicator is preferably a benzidine derivative according to the general formula ##STR1## in which the radicals R are identical or different and denote a hydrogen, alkyl, aryl, halogen, trifluoromethyl, cyano, nitro, dialkylamino, ester, sulfoxyl ester, alkyloxy or aryloxy, X denotes a halogen, Y denotes a trifluoromethyl, cyano, nitro, dialkylamino, ester, sulfoxyl ester, alkyloxy or aryloxy, n is an integer from zero to three, and m equals 5-n. The testing elements are preferably designed as detector tubes that contain carrier materials, to which the oxidizing reagents and redox indicators are applied.
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