Questions and Answers
What are the primary steps involved in the modified Jacob and Hochheiser method for determining NOx in ambient air?
The primary steps include sampling air through a chemical trap, converting NO to NO2, and then reducing the nitrogen oxides to measure the final concentration.
Explain the role of the chemical trap in the modified Jacob and Hochheiser method.
The chemical trap selectively absorbs nitrogen oxides from the ambient air, allowing for their subsequent analysis.
Why is it necessary to convert NO to NO2 in the NOx determination process?
This conversion is necessary because it allows for a more accurate measurement, as NO2 can be more easily quantified in the subsequent steps.
What challenges might arise during the determination of NOx using the modified Jacob and Hochheiser method?
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Describe how the reduction process contributes to the quantification of NOx in the modified method.
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