Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy in the near-Ultraviolet: Application to HONO and NO2

The first application of incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) in the near-ultraviolet for the simultaneous detection of two key atmospheric trace species, HONO and NO2, is reported. For both compounds the absorption is measured between 360 and 380 nm with a compact...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 2008-02, Vol.42 (3), p.890-895
Main Authors: Gherman, Titus, Venables, Dean S, Vaughan, Stewart, Orphal, Johannes, Ruth, Albert A
Format: Article
Language:English
Subjects:
Absorption
Applied sciences
Environmental Measurements Methods
Exact sciences and technology
Light
Nitrogen Dioxide - analysis
Nitrous Acid - analysis
Pollution
Spectrum Analysis - methods
Ultraviolet Rays
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The first application of incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) in the near-ultraviolet for the simultaneous detection of two key atmospheric trace species, HONO and NO2, is reported. For both compounds the absorption is measured between 360 and 380 nm with a compact cavity-enhanced spectrometer employing a high power light-emitting diode. Detection limits of ∼4 ppbv for HONO and ∼14 ppbv for NO2 are reported for a static gas cell setup using a 20 s acquisition time. Based on an acquisition time of 10 min and an optical cavity length of 4.5 m detection limits of ∼0.13 ppbv and ∼0.38 ppbv were found for HONO and NO2 in a 4 m3 atmospheric simulation chamber, demonstrating the usefulness of this approach for in situ monitoring of these important species in laboratory studies or field campaigns.
ISSN:0013-936X
1520-5851
DOI:10.1021/es0716913