Monitoring Atmospheric Particulate Matter through Cavity Ring-Down Spectroscopy

详细信息    查看全文

• 作者：Jonathan E. Thompson ; Benjamin W. Smith ; and James D. Winefordner
• 刊名：Analytical Chemistry
• 出版年：2002
• 出版时间：May 1, 2002
• 年：2002
• 卷：74
• 期：9
• 页码：1962 - 1967
• 全文大小：278K
• 年卷期：v.74,no.9(May 1, 2002)
• ISSN：1520-6882

文摘

Cavity ring-down spectroscopy was explored as a meansto measure atmospheric optical extinction. Ambient airwas sampled through a window on the campus of theUniversity of Florida and transported to a ring-down cellfashioned from standard stainless steel vacuum components. When a copper vapor laser operating at 10 kHz isemployed, this arrangement allowed for nearly continuousmonitoring of atmospheric extinction at 510 and 578 nm.We have characterized the system performance in termsof detection limit and dynamic range and also monitoreda change in atmospheric extinction during a nearbywildfire and fireworks exhibition. The sensitivity andcompatibility with automation of the technique renders ituseful as a laboratory-based measurement of airborneparticulate matter.