Chemistry: analytical and immunological testing – Nitrogen containing – Nitrite or nitrate
Patent
1993-01-21
1994-04-05
Housel, James C.
Chemistry: analytical and immunological testing
Nitrogen containing
Nitrite or nitrate
436106, 436107, 436114, 436116, 436117, 436118, 436172, G01N 2162, G01N 2176
Patent
active
053004418
ABSTRACT:
A method for analyzing total bound nitrogen in a sample and providing an output data of total bound nitrogen and constituent compounds (nitrate and nitrite) is disclosed. The total nitrogen bound method provides a discrete sample through a furnace in the presence of continuous flow of water as carrier as well as oxygen carrier gas, resulting in the oxidation of the nitrogen compounds to nitric oxide. The nitrate method involves a discrete sample with water as a carrier provided to a sparge tank. The nitrite is catalytically reduced to nitric oxide in the presence of tartaric acid and ascorbic acid. The nitrate method involves a first conversion to change the nitrate to a nitrite. The first conversion occurs in the presence of a copper-cadmium catalyst causing the formation of the NO.sub.2. The nitrile is subsequently converted into NO. The nitric oxide produced in each of the three methods is measured in a chemiluminescent nitrogen detector.
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Britten Allen J.
Fujinari Eugene M.
Antek Instruments, Inc.
Gunn Donald
Housel James C.
Redding David
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