title: Detection of sulfur dioxide by cavity ring-down spectroscopy.
abstract: Sulfur dioxide (SO(2)) is a major air pollutant that can contribute to the production of particulate sulfate and increase the acidity in the environment. SO(2) is detected by cavity ring-down spectroscopy (CRDS) utilizing the SO(2) absorption in the 308 nm region. A ferrous sulfate scrubber and a sodium carbonate annular denuder are used to reduce background interferences and to obtain quantitative values of SO(2). The method is characterized using SO(2) standards in the laboratory and compared to a commercial pulsed fluorescence analyzer (PFA). A limit of detection of 3.5 ppb/10 s (S/N = 2) is demonstrated. Ambient measurements are attempted to demonstrate this technique.
authors.affiliation: Department of Chemistry and Air Pollution Research Center, University of California, Riverside, California 92521, United States.
authors.forename: David S
authors.initials: DS
authors.lastname: Medina
authors.forename: Yingdi
authors.initials: Y
authors.lastname: Liu
authors.forename: Liming
authors.initials: L
authors.lastname: Wang
authors.forename: Jingsong
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000042:Absorption; D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D013057:Spectrum Analysis / Q000379:methods; D013458:Sulfur Dioxide / Q000032:analysis* / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D013458:Sulfur Dioxide