Abstract − Analytical Sciences, 19(8), 1109 (2003).
Detection of Chlorobenzene DerivativesUsing Vacuum Ultraviolet Ionization Time-of-Flight MassSpectrometry
Kenichi TONOKURA, Tomohisa NAKAMURA, and Mitsuo KOSHI
Department of Chemical SystemEngineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo,Bunkyo, Tokyo 113-8656, Japan
Vacuum ultraviolet single-photon ionizationtime-of-flight mass spectrometry (VUV-SPI-TOFMS) has been applied for thedetection of chlorobenzene, o-dichlorobenzene, ando-chlorophenol as surrogates for polychlorinateddibenzo-p-dioxine/furans (PCDD/F). The photoionization mass spectraof these compounds appear to be fragmentation free in the ionizationprocesses by the VUV-SPI at 10.2 eV (121.6 nm). Quantum chemicalcalculations support no fragmentation in the photoionization ofchlorobenzene derivatives at around 10 eV. The absolute photoionizationcross-sections of chlorobenzene, o-dichlorobenzene, ando-chlorophenol were estimated at 10.2 eV. The photoionizationcross-section is an important parameter in the detection of chlorobenzenederivatives by the single-photon ionization technique. The detection limitfor chlorobenzene is on the order of tenth parts-per-billion volume (ppbv)in the present experimental setup.
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