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Updated: Aug 22, 2026

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Published on: August 18, 2017
Selective multiphoton ionization of coplanar polychlorobiphenyls using 266-nm laser emission by gas
Tomohiro Uchimura1, Kunihiro Sakai, Totaro Imasaka
1Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Hakozaki, Fukuoka, 812-8581, Japan.
Abstract:
Polychlorinated biphenyls (PCBs), used as a heat exchange oil (Kanechlor, KC-300), can be measured by gas chromatography combined with multiphoton ionization mass spectrometry (GC/MPI-MS). Several compounds, e.g., 4,4'-dichlorobiphenyl and 3,4,4'-trichlorobiphenyl, have nearly the same retention time but can be selectively determined by MPI-MS. Coplanar PCBs are more efficiently ionized using the fourth harmonic emission of a Nd:YAG laser (266 nm), compared to noncoplanar PCBs. Thus, the approach reported herein may be useful in the selective as well as the sensitive analysis of toxic PCBs, contained in old transformers and capacitors that have been mandated by the government to be properly disposed of within 10 years in Japan.
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