Search and Determination of Polycyclic Aromatic Hydrocarbons in Atmospheric Aerosols of the Arctic Urban Agglomeration by Gas Chromatography–High-Resolution Mass Spectrometry
摘要
This study presents the results of the identification and quantification of polycyclic aromatic hydrocarbons (PAHs) in atmospheric aerosol particles. Suspended particulate matter (PM2.5) was collected in Arkhangelsk, a major city in the Arctic zone, using glass fiber membrane filters with a pore size of 1.6 μm. PAHs were extracted from the particle surfaces by ultrasonic extraction in methanol. Gas chromatography coupled with high-resolution mass spectrometry (GC–HRMS) employing an Orbitrap analyzer enabled limits of detection for the target analytes ranging from 0.020 to 1.5 ng/m3 (per 1.8 m3 of air). Concentrations of individual PAHs varied from 1.2 to 4.0 ng/m3, with total concentrations of the 18 target PAHs being 17 and 32 ng/m3 for samples 2 and 1, respectively. Diagnostic ratios of PAH isomers indicated that pyrogenic sources, including incomplete fuel combustion and biomass burning, were the dominant contributors. Non-targeted screening identified 31 compounds, including oxygenated derivatives of phenanthrene and anthracene, nitrogen-containing PAHs, and high-molecular-weight PAHs, such as benzo[j]fluoranthene, benzo[e]pyrene, and perylene. These environmentally significant pollutants were present in concentrations of approximately 1–2 ng/m3.