Duong Vu Thi Thuy, Duong Vu, Lien Nghiem Thi Ha, Imasaka Tomoko, Tang Yuanyuan, Shibuta Shinpei, Hamachi Akifumi, Hoa Do Quang, Imasaka Totaro
Institute of Physics, Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam.
Laboratory of Chemistry, Graduate School of Design, Kyushu University, 4-9-1, Shiobaru, Minami-ku, Fukuoka 815-8540, Japan.
Talanta. 2016 Mar;149:275-279. doi: 10.1016/j.talanta.2015.11.054. Epub 2015 Nov 25.
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.
采用气相色谱结合多光子电离质谱法测定变压器油和食用油中的多氯联苯（PCBs）。利用在远紫外区域发射的超短激光脉冲对分析物进行高效电离。当使用飞秒钛宝石激光器（800nm）的第三和第四谐波发射（267和200nm）时，在多氯联苯标准样品混合物中清晰地观察到许多信号峰。结果发现，与在267nm处测量相比，在200nm处测量时信号强度更高，这为较短波长下的高氯代多氯联苯提供了更低的检测限。经过一次性柱的简单预处理后，对多氯联苯同系物进行了测量，发现越南使用的变压器油中存在这些同系物。
