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Which of the following analyzers are used to measure trace amounts of nitrogen oxides in the stratosphere?

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Which of the following analyzers are used to measure trace amounts of nitrogen oxides in the stratosphere?

(a) Chemiluminescence

(b) CO laser method

(c) Laser opto-acoustic spectroscopy

(d) Colorimetry

I have been asked this question in unit test.

The origin of the question is NO2 Analyser in division Industrial Gas Analysers of Analytical Instrumentation

1 Answer

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Correct answer is (c) Laser opto-acoustic spectroscopy

The explanation: Laser opto-acoustic spectroscopy is used to measure trace amounts of nitrogen oxides in the stratosphere. It was developed for application in air pollution measurement.

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