Journal
SENSORS
Volume 22, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/s22072626
Keywords
optical cavity; SO2 interference; trace gas detection; air quality monitoring; air pollution
Funding
- Utah NASA Space Grant Consortium's Faculty Research Seed Funding Award from the Department of Chemistry and Biochemistry's
- National Science Foundation [AGS-2114655]
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SO2 is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We developed an instrument using BBCEAS for the measurement of SO2, with a minimum limit of detection of 0.75 ppbv, using the spectral range 305.5-312 nm and an averaging time of 5 min. The instrument showed good correlation compared to fluorescence standard measurements.
Sulfur dioxide (SO2) is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a minimum limit of detection of 0.75 ppbv (3-sigma) using the spectral range 305.5-312 nm and an averaging time of 5 min. The instrument consists of high-reflectivity mirrors (0.9985 at 310 nm) and a deep UV light source (Light Emitting Diode). The effective absorption path length of the instrument is 610 m with a 0.966 m base length. Published reference absorption cross sections were used to fit and retrieve the SO2 concentrations and were compared to fluorescence standard measurements for SO2. The comparison was well correlated, R-2 = 0.9998 with a correlation slope of 1.04. Interferences for fluorescence measurements were tested and the BBCEAS showed no interference, while ambient measurements responded similarly to standard measurement techniques.
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