摘要：The stability of 61 polycyclic aromatic hydrocarbons (PAHs) (27 nonpolar, 20 oxygenated, and 14 deuterated PAHs) in quartz fiber filters with or without airborne particulates, and acetonitrile during storage under different conditions was investigated using gas chromatography-mass spectrometry (GC-MS). Most of the investigated PAHs except 11 volatile PAHs in quartz fiber filters, and all of PAHs in acetonitrile were stable during 1 week storage and 4 week-storage in a refrigerator at 4°C, respectively. It was found that 14 PAHs in quartz fiber filters and 9 PAHs in airborne particulates decreased less than 70% under UV light during 2 weeks. Photodegradation of PAHs spiked in quartz fiber filters under UV storage was faster than those in airborne particulates. Thirty-two and 39 PAHs in acetonitrile decreased less than 70% during 2 week-storage and 4 week-storage under sunlight by the window, respectively. Photo-changed compounds such as anthracene, benz [a] anthracene, naphthacene, 9-anthraldehyde, acenaphthenequinone and anthracene-d10 were tentatively identified by GC-MS. It was clarified that nonpolar and oxygenated PAHs were gradually changed into their oxygenated derivatives such as quinones and ketones. Consequently, it is recommendable that the airborne particulate sample and standard solution for PAHs should be kept without light such as in a refrigerator.
