Real-Time Measurement of Polychlorinated Biphenyls Using Laser Ionization Time of Flight Mass Spectroscopy

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  • レーザイオン化ＴＯＦＭＳによるＰＣＢリアルタイム計測技術
  • レーザ イオンカ TOFMS ニ ヨル PCB リアルタイム ケイソク ギジュツ

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Abstract

Polychlorinated biphenyls (PCBs) are environmental chemicals and there are few methods for real-time PCB measurement. This study demonstrates the applicability of the real-time measurement of PCBs using LI-TOFMS (Laser Ionization Time of Flight Mass Spectroscopy). In order to develop a highly selective and sensitive method, the effective laser wavelength and pulse width for laser ionization of PCBs are discussed. Excitation at λ=266nm is found to be substantially more effective than at λ=280, 300 or 320nm. Also picosecond excitation for PCBs undergoes more efficient ionization (by a factor of over 10) and less fragmentation than nanosecond excitation. The achievable trichlorinated biphenyl sensitivity for real-time (1min) measurement using the LI-TOFMS technique is determined to be in the sub-ppbV range (<0.01mg/Nm3).

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