کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4425888 | 1619214 | 2009 | 7 صفحه PDF | دانلود رایگان |
A novel analytical method for atmospheric polycyclic aromatic hydrocarbons (PAHs) was developed based on laser induced fluorescence (LIF) of samples on quartz multi-channel polydimethylsiloxane traps. A tunable dye laser with a frequency doubling crystal provided the excitation radiation, and a double monochromator with a photomultiplier tube detected emitted fluorescence. The method allowed for the rapid (<5 min), cost effective analysis of samples. Those yielding interesting results could be further analysed by direct thermal desorption-gas chromatography–mass spectrometry (TD–GC–MS, with limits of detection of ∼0.3 ng m−3), as photodegradation was minimal (<10% over 5 min irradiation). Small amounts of naphthalene photodegradation products identified by TD–GC–MS after >15 min irradiation, included phenol, benzyl alcohol and phthalic anhydride. Without any signal optimization, a LIF detection limit of ∼1 μg m−3 was established for naphthalene using a diffusion tube (diffusion rate of 2 ng s−1) and 292 nm excitation.
Journal: Environmental Pollution - Volume 157, Issues 8–9, August–September 2009, Pages 2529–2535