Abstract
Recently, a method of analyzing dioxin concentration with high sensitivity is desired. Laser ionization timeof-flight mass spectroscopy (LI TOF-MS) has been developed to satisfy this need. In this study, the detection sensitivity of a few ppt for chlorobenzene, which is a precursor of dioxin, was realized by adjusting the laser beam, the molecular jet and other conditions of the LI TOF-MS system. This sensitivity is 300 times higher than that of gas chromatography mass spectroscopy (GC-MS). Furthermore, selective detection ofthe isomers of dichlorobenzene was performed by making use of the difference of ionization wavelength. LI TOF-MS is expected to be an on-line monitor analyzer of dioxin concentration in exhaust gas by detectingthe precursors of dioxin.
