Initial results of continuous monitoring of dioxins surrogate using laser mass spectrometry

Jing Ma; Li Fang; H. Y. Zheng; Lei Ding; X. J. Gu; W. J. Zhang

doi:10.1117/12.619867

12 May 2005 Initial results of continuous monitoring of dioxins surrogate using laser mass spectrometry

Jing Ma, Li Fang, H. Y. Zheng, Lei Ding, X. J. Gu, W. J. Zhang

Proceedings Volume 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies; (2005) https://doi.org/10.1117/12.619867
Event: Optical Technologies for Atmospheric, Ocean, and Environmental Studies, 2004, Beijing, China

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.

Citation Download Citation

Jing Ma, Li Fang, H. Y. Zheng, Lei Ding, X. J. Gu, and W. J. Zhang "Initial results of continuous monitoring of dioxins surrogate using laser mass spectrometry", Proc. SPIE 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies, (12 May 2005); https://doi.org/10.1117/12.619867

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