Determination of Hexachlorocyclohexane by Gas Chromatography Combined with Femtosecond Laser Ionization Mass Spectrometry |
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| Authors: | Xixiang Yang Tomoko Imasaka Adan Li Totaro Imasaka |
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| Affiliation: | 1.Department of Applied Chemistry, Graduate School of Engineering,Kyushu University,Nishi-ku,Japan;2.Laboratory of Chemistry, Graduate School of Design,Kyushu University,Minami-ku,Japan;3.Division of International Strategy, Center of Future Chemistry,Kyushu University,Nishi-ku,Japan;4.College of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao,China |
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| Abstract: | Structural isomers and enantiomers of hexachlorocyclohexane (HCH) were separated using a chiral column by gas chromatography and quantitatively determined by multiphoton ionization mass spectrometry using an ultraviolet femtosecond laser (200 and 267 nm) as the ionization source. The order of elution of the enantiomers (i.e., (+)-α-HCH and (-)-α-HCH) was predicted from stabilization energies calculated for the complexes using permethylated γ-cyclodextrin as the stationary phase of the column, and the results were compared with the experimental data. The molecular ions observed for HCH were weak, even though they can be ionized through a process of resonance enhanced two-photon ionization at 200 nm. This unfavorable result can be attributed to the dissociation of the molecular ion, as predicted from quantum chemical calculations. |
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