engleski

An inter-comparison of size segregated carbonaceous aerosol collected by low-volume impactor in the port-cities of Venice (Italy) and Rijeka (Croatia)

Size-segregated studies of organic and elemental carbon (EC, OC) in aerosol is essential in understanding sources and effects on the environment. However, these studies are scarce , especially in coastal areas stressed by anthropogenic emissions and with interactions between anthropogenic and natural emissions. To partially fill this lack of information, aerosol siye segregated samples were takrđen between August 2018 and May 2019, using a MOUDI impactor. A thermal-optical analysis (EUSAAR2) allowed EC and OC determination in different size ranges. For Rijeka site, the water soluble organic carbon content (WSOC) was analysed. OC and EC average concentrations in Venice were 3.16 (± 0.97) and 0.40 (±0.13) μg/m3 in Rijeka were 2.48 (± 0.65) and 0.37 (±0.08) μg/m3. The OC size distributions were bimodal at both sites, with an accumulation mode in the size range 0, 56-0, 32 μm, a coarse mode in the range 5.6-3.2 μm . EC showed a bimodal distribution in Rijeka, a single fine mode in Venice. The EC/TC ratio was large in the fine mode at both sites , however, in Rijeka non-negligible values were found in. coarse fractions, suggesting contributions from resuspensions od carbon loaded dust and mixing of anthropogenic particles with sea spray.. The WSOC/OC analysis as function of particle size in Rijeka showed a total value of 0.51 (± 0.12) with an increase in the coarse fraction likely due to a contribution of water soluble carbon from sea spray and f biogenic emissions.

carbonaceous aerosol ; carbon size distributions ; OC/EC, WSOC ; port-cities

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