Discussion
On what reaction does a chemiluminescence nitrogen oxides analyser depend?
Answer: D
Ozone oxidises nitric oxide, and a fraction of the nitrogen dioxide formed is electronically excited and emits light in the red and near infrared as it relaxes, the intensity being proportional to the nitric oxide present. To measure total oxides of nitrogen the sample is first passed through a converter that reduces nitrogen dioxide back to nitric oxide, and the difference between the two modes gives the dioxide. The other options describe the sulphur dioxide analyser, the flame ionisation detector and a wet chemical method.
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