title: Determination of polycyclic aromatic hydrocarbons and their nitro-, amino-derivatives absorbed on particulate matter 2.5 by multiphoton ionization mass spectrometry using far-, deep-, and near-ultraviolet femtosecond lasers.
abstract: Multiphoton ionization processes of parent-polycyclic aromatic hydrocarbons (PPAHs), nitro-PAHs (NPAHs), and amino-PAHs (APAHs) were examined by gas chromatography combined with time-of-flight mass spectrometry using a femtosecond Ti:sapphire laser as the ionization source. The efficiency of multiphoton ionization was examined using lasers emitting in the far-ultraviolet (200 nm), deep-ultraviolet (267 nm), and near-ultraviolet (345 nm) regions. The largest signal intensities were obtained when the far-ultraviolet laser was employed. This favorable result can be attributed to the fact that these compounds have the largest molar absorptivities in the far-ultraviolet region. On the other hand, APAHs were ionized more efficiently than NPAHs in the near-ultraviolet region because of their low ionization energies. A sample extracted from a real particulate matter 2.5 (PM2.5) sample was measured, and numerous signal peaks arising from PAH and its analogs were observed at 200 nm. On the other hand, only a limited number of signed peaks were observed at 345 nm, some of which were signed to PPAHs, NPAHs, and APAHs. Thus, multiphoton ionization mass spectrometry has potential for the use in comprehensive analysis of toxic environmental pollutants.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan. Electronic address: tang.yuanyuan.398@s.kyushu-u.ac.jp.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Tang
authors.affiliation: Laboratory of Chemistry, Graduate School of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka, 815-8540, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Imasaka
authors.affiliation: Division of Air Science, Fukuoka Institute of Health and Environmental Sciences, 39 Mukaizano Dazaifu, Fukuoka, 818-0135, Japan.
authors.forename: Shigekazu
authors.initials: S
authors.lastname: Yamamoto
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; Division of Optoelectronics and Photonics, Center for Future Chemistry, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Totaro
authors.initials: T
authors.lastname: Imasaka
mesh_terms: D065966:Absorption, Physicochemical; D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D000588:Amines / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods*; D004867:Equipment Design; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D009574:Nitro Compounds / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis* / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D000588:Amines; D009574:Nitro Compounds; D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons
keywords: Mass spectrometry; Multiphoton ionization; Organic pollutants; Particulate matter 2.5; Ultraviolet femtosecond laser