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
Answer:C
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
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.