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Proceedings Paper

Initial results of continuous monitoring of dioxins surrogate using laser mass spectrometry
Author(s): Jing Ma; Li Fang; H. Y. Zheng; Lei Ding; X. J. Gu; W. J. Zhang
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Paper Abstract

Dioxins (polychiorinated dibenzo-p-dioxin/furan congeners) are the most toxic chemicals among the by-products emitted from combustion processes in trace amounts. Since the concentration of dioxins in flue gas is far beyond the detection limits of today's on-line methods the idea of using surrogate compounds of dioxins for fast measuring come up. Many evidences confirm that chlorobenzenes (monochlorobenze and some polychiorinated benzenes) are the suitable surrogates for on-line measuring of the dioxins in the flue gas by laser mass spectrometry. In this paper we present the principles of laser mass spectrometry. The 1+1 two-photon Resonant Enhanced Multiphoton Ionization (REMPI) spectra of monochlorobenzene in the range 240≈250nm are studied. The measurement shows that monochlorobenzene has the highest ionization efficiency excited at 248.6nm in this wavelength range and the detection limit of monochlorobenzene at ppb(v/v) concentration is obtained. The REPMI-MS properties of monochlorobenzene in this wavelength range provide useful information of practical measurements on mixtures.

Paper Details

Date Published: 12 May 2005
PDF: 8 pages
Proc. SPIE 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies, (12 May 2005); doi: 10.1117/12.619867
Show Author Affiliations
Jing Ma, Anhui Institute of Optics and Fine Mechanics, CAS (China)
Li Fang, Anhui Institute of Optics and Fine Mechanics, CAS (China)
H. Y. Zheng, Anhui Institute of Optics and Fine Mechanics, CAS (China)
Lei Ding, Anhui Institute of Optics and Fine Mechanics, CAS (China)
X. J. Gu, Anhui Institute of Optics and Fine Mechanics, CAS (China)
W. J. Zhang, Anhui Institute of Optics and Fine Mechanics, CAS (China)


Published in SPIE Proceedings Vol. 5832:
Optical Technologies for Atmospheric, Ocean, and Environmental Studies

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