Chemistry: analytical and immunological testing – Nitrogen containing – Oxides of nitrogen
Patent
1995-03-14
1997-05-27
Warden, Jill
Chemistry: analytical and immunological testing
Nitrogen containing
Oxides of nitrogen
436115, 436117, 436118, 436172, 4232391, 423402, 423405, 502185, G01N 2176
Patent
active
056331703
ABSTRACT:
A method and apparatus for the chemiluminescent determination of NO/NO.sub.x in a sample gas is disclosed in which the NO.sub.x portion of the gas stream is catalytically converted in a preconditioned vitreous carbon bed at a relatively low temperature effective to catalytically convert NO.sub.x to NO and below 200.degree. C. The vitreous carbon is preconditioned by heating at a temperature of between 300.degree. C. and about 500.degree. C. for a sufficient period of time, on the order of two to five hours. The apparatus consists of a converter containing the preconditioned vitreous carbon in communication with a reaction cell consisting of a hollow cylindrical housing having an open end closed by an optical filter. A suitable photodetecter is disposed to detect light emitted through the optical filter. A chemiluminescent reaction between ozone and NO in the sample stream occurs in a reaction chamber defined by the interior of the housing. A reflector element may be disposed in the reaction chamber. The converter and the housing are preferably formed of low cost, easily worked materials, such as stainless steel or aluminum.
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Carrillo Sharidan
Vanderburgh John E.
Warden Jill
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