采用腔衰荡光谱法检测二氧化硫。

Detection of sulfur dioxide by cavity ring-down spectroscopy.

机构信息

Department of Chemistry and Air Pollution Research Center, University of California, Riverside, California 92521, United States.

出版信息

Environ Sci Technol. 2011 Mar 1;45(5):1926-31. doi: 10.1021/es103739r. Epub 2011 Feb 10.

DOI:10.1021/es103739r

PMID:21309509

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.

摘要

二氧化硫（SO2）是一种主要的空气污染物，它可以促进硫酸盐颗粒的形成，并增加环境的酸度。二氧化硫的检测采用腔衰荡光谱法（CRDS），利用 308nm 区域的 SO2 吸收。使用硫酸亚铁洗涤器和碳酸钠环形吹脱管来减少背景干扰，并获得 SO2 的定量值。该方法通过实验室中的 SO2 标准品进行了特征描述，并与商业脉冲荧光分析仪（PFA）进行了比较。结果表明，检测限为 3.5ppb/10s（S/N=2）。尝试进行了环境测量以验证该技术。