VERFAHREN ZUR QUANTITATIVEN BESTIMMUNG VON STICKSTOFFVERBINDUNGEN IN GASGEMISCHEN

摘要

1343859 Gas analysis FORD MOTOR CO Ltd 19 May 1972 [29 June 1971] 19410/73 Divided out of 1343858 Heading G1B To measure the amount of ammonia in a gaseous mixture containing quantities of nitric oxide and nitrogen dioxide, the mixture is passed over a heated copper catalyst to convert substantially all the ammonia to nitric oxide, and the amount of nitric oxide in the resulting mixture is measured. Any nitrogen dioxide present will also be converted to nitric oxide by the copper. Preferably nitric oxide measurement is by reacting the catalysed mixture with a reactant capable of producing chemiluminescence with nitric oxide, and measuring the chemiluminescence of the reaction as described in Specification's 1341346 and 1341347, but other means, such as nondispersive infrared instruments or electrolytic techniques may be used. Apparatus identical to that disclosed in Specification 1343858 for measurement of ammonia, nitric oxide, and nitrogen dioxide in a gaseous mixture is described.