Detection of Dioxins by Femtosecond Laser Ionization Mass Spectrometry

SHIMADA Yoshinori, MIZOGUCHI Ryuji, SHINOHARA Hidenori, YATSUHASHI Tomoyuki, NAKASHIMA Nobuaki

doi:10.2116/bunsekikagaku.54.127

For the first time, femtosecond laser mass spectrometry (FLMS) has successfully detected 1,3,6-trichlorodibenzo-p-dioxin and 2,2',5-trichlorobiphenyl. Non-chlorinated dibenzo-p-dioxin and biphenyl were also compared with the results of trichlorinated dioxins. The formation of parent ions without heavy fragmentation is an important goal for laser mass spectrometry; in other words, a high signal intensity ratio value of the parent ions/total ions (P/T ratios) is essential. The ratios were found to depend on the laser intensities as well as the wavelengths in FLMS. Generally, dioxins were more highly fragmented with increases in the laser intensity for all compounds studied here; the P/T ratios of non-chlorinated dioxins were higher with increases in the laser wavelength. The wavelength dependency for the chlorinated compounds was not distinct, probably because C-Cl bonds are easily dissociated in high-intensity laser fields, which induce further fragmentation. As a consequence of dissociation, the P/T ratios of the chlorinated dioxins were lower than the non-chlorinated dioxins. Within our experimental parameters, the optimum laser conditions were 1500 nm excitation with an intensity of 3.0×10¹³ W/cm² for 1,3,6-trichlorodibenzo-p-dioxin and 2000 nm and 3.3×10¹³ W/cm² for 2,2',5-trichlorobiphenyl.<br>

Detection of Dioxins by Femtosecond Laser Ionization Mass Spectrometry

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