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Detection of sulfur dioxide by cavity ring-down spectroscopy
David S Medina1, Yingdi Liu, Liming Wang
1Department of Chemistry and Air Pollution Research Center, University of California, Riverside, California 92521, United States.
This study presents a new method for detecting sulfur dioxide (SO(2)) using cavity ring-down spectroscopy. The technique achieves a low detection limit, showing promise for environmental monitoring of this key air pollutant.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Atmospheric Chemistry
Background:
- Sulfur dioxide (SO(2)) is a significant air pollutant.
- SO(2) contributes to particulate sulfate formation and environmental acidification.
- Accurate detection of SO(2) is crucial for environmental monitoring.
Purpose of the Study:
- To develop and characterize a novel method for SO(2) detection.
- To utilize cavity ring-down spectroscopy (CRDS) for SO(2) analysis.
- To assess the method's performance against existing technologies.
Main Methods:
- Detection of SO(2) via its absorption at 308 nm using CRDS.
- Employing a ferrous sulfate scrubber and sodium carbonate annular denuder for interference reduction.
- Laboratory characterization with SO(2) standards and comparison with a pulsed fluorescence analyzer (PFA).
Main Results:
- Demonstrated a limit of detection of 3.5 ppb/10 s (S/N = 2).
- Quantitative SO(2) values were obtained after interference reduction.
- The CRDS method shows potential for accurate SO(2) measurement.
Conclusions:
- The developed CRDS method is effective for SO(2) detection.
- The technique offers a sensitive approach for monitoring SO(2) in ambient air.
- Further ambient measurements are needed to fully demonstrate the technique's applicability.
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