engleski

PAH’S CONCENTRATIONS IN PM10, PM2.5 AND PM1 PARTICULATE FRACTION IN THE AIR

Polycyclic aromatic hydrocarbons (PAHs) are products of incomplete combustion or organic matter pyrolysis. Many have been identified as potential carcinogens. Benzo(a)pyrene (BaP) is the most commonly measured PAH due to its inevitable presence. Chromatographic methods for PAH analyses in environmental media have been developed and evaluated extensively over the past few decades, including HPLC and GC analysis. Liquid chromatography with fluorescence detection is suitable for samples with low concentrations of anthracene and perylene, due to their selective and sensitive fluorescence. Investigations of PAHs in the air are mostly focused on those bounded at particles with an aerodynamic diameter of less than 10 μm (PM10). Nowadays, smaller particles attract the most interest. This paper presents the results of PAH measurements in particle fractions PM10, PM2.5, PM1. Daily samples of particle fractions were collected on a quartz filter during two winter months (January and February 2011) and two summer months (June and July 2011). The samples were analyzed with HPLC fluorescence detection and changeable excitation and emission wavelength. The samples were analyzed for the following PAHs: benzo(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene, and benzo(a)pyrene. The recoveries of PAHs were determined by adding a known amount of the PAH to a blank filter. The average recoveries of all of the analyzed PAHs varied from 85% to 92%. Average mass concentrations of BaP in the winter period were 2.258 ng/m3 in the PM10 fraction, 2.221 ng/m3 in the PM2.5 fraction, and 1.474 ng/m3 in the PM1 fraction. In the summer period, BaP concentrations were 0, 073 ng/m3 in the PM10 fraction, 0.069 ng/m3 in the PM2.5 fraction, and 0, 060 ng/m3 in the PM1 fraction. Comparison of BaP concentrations in PM10 and PM1 showed that more than 60% of BaP concentrations in the winter period and more than 80% in the summer period were in the PM1 particle fraction. Other PAHs showed a similar tendency to BaP.

Benzo(a)pyrene; HPLC

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