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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) ColorimetryI have been asked this question in unit test.The origin of the question is NO2 Analyser in division Industrial Gas Analysers of Analytical Instrumentation

Answer»

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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