Detection of polychlorinated biphenyls in transformer oils in Vietnam by multiphoton ionization mass spectrometry using a far-ultraviolet femtosecond laser as an ionization source
| Autor: | Vu Duong, Nghiem Thi Ha Lien, Akifumi Hamachi, Shinpei Shibuta, Do Quang Hoa, Totaro Imasaka, Tomoko Imasaka, Yuanyuan Tang, V. T.T. Duong |
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| Rok vydání: | 2015 |
| Předmět: |
Detection limit
Chemistry 010401 analytical chemistry Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Mass spectrometry Laser 01 natural sciences 0104 chemical sciences Analytical Chemistry Atmospheric-pressure laser ionization law.invention law Ionization Femtosecond Gas chromatography 0210 nano-technology Spectroscopy |
| Zdroj: | Talanta. 149 |
| ISSN: | 1873-3573 |
| Popis: | Polychlorinated biphenyls (PCBs) in transformer and food oils were measured using gas chromatography combined with multiphoton ionization mass spectroscopy. An ultrashort laser pulse emitting in the far-ultraviolet region was utilized for efficient ionization of the analytes. Numerous signal peaks were clearly observed for a standard sample mixture of PCBs when the third and fourth harmonic emissions (267 and 200nm) of a femtosecond Ti:sapphire laser (800nm) were employed. The signal intensities were found to be greater when measured at 200nm compared with those measured at 267nm, providing lower detection limits especially for highly chlorinated PCBs at shorter wavelengths. After simple pretreatment using disposable columns, PCB congeners were measured and found to be present in the transformer oils used in Vietnam. |
| Databáze: | OpenAIRE |
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