抄録
A determination method of atmospheric oxygenated polycyclic aromatic hydrocarbons (Oxy-PAHs) in particulate matter and the gaseous phase using gas chromatograph (GC)-mass spectrometer (MS) was studied in the present study. First, we obtained fundamental data of GC-MS analyses (mass spectra and calibration curves) of twelve Oxy-PAHs as follows: acenaphthenequinone (AceQ), 1,4-naphtoquinone (1,4-NQ), 9-fluorenone (9-F-one), 1,4-phenanthrenequinone (1,4-PQ), 1,4-, 9,10-anthaquinone (1,4-, 9,10-AQ), 1-hydroxyanthrquinone (1-OHAQ), 1,2-benzanthraquinone (1,2-BAQ), benz[c]phenanthrene[1,4]quinine (BcP-1,4Q), 3,4-dihydrobenzo[a]anthracene-1(2H)-one (BaA-one), 1,4-chrysenequinone (1,4-CQ) and 9,10-dihydrobenzo[a]pyrene-7(8H)-one (BaP-one). Subsequently, to evaluate collection efficiency of Oxy-PAHs, air was passed through a quartz-fiber filter (QFF) spiked with authentic Oxy-PAHs and then through cleaned polyurethane form (PUF) plugs using a mini-pump or a low-volume air sampler for 24 h in the dark at a constant room temperature (20 or 35 °C). Oxy-PAHs retained on the QFF and those trapped within PUF plugs were simultaneously Soxhlet extracted, purified with silica by gel column chromatography and determined using GC-MS.
The calibration curves for the determination of the twelve Oxy-PAHs were proportional in the concentration range between 0.02 and 1.0 μg/mL with r2 values of 0.960-0.999. Among the twelve Oxy-PAH compounds examined, recoveries of six compounds (1,4-NQ, 9-F-one, 9,10-AQ, 1,2-BAQ, BaA-one and BaP-one) during sampling, Soxhlet-extraction and clean-up procedures sufficiently yielded 79-127% at a room temperature of 20 °C and 57-127% at 35 °C . The method detection limits (MDLs) of the six compounds ranged between 0.61-1.07 ng/m3.
The proposed method was applied to the determination of the six Oxy-PAH compounds in the atmosphere. Air sample was collected at an urban location of Osaka, Japan for 12-13 February 2007. 1,4-NQ, 9-F-one and 9-F-one were detected in the sample at concentration level of approximately 0.7-3 ng/m3.
