Naslov
Carbon content in PM2.5 at a coastal measuring site in Croatia

Autori
Godec, Ranka ; Šimić Iva ; Šilović Hujić, Martina ; Bešlić, Ivan ; Davila, Silvije ; Mihaljević, Martin

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings 18th World Clean Air Congress 2019 / Kara, Melik ; Dumanoglu, Yetkin ; Tuna Tuygun, Gizem ; Bayram, Abdurrahman ; Elbir, Tolga - Istanbul : Turkish National Committee for Air Pollution Research and Control (TUNCAP), 2019, 94-104

ISBN
978-975-00331-2-4

Skup
18th World Clean Air Congress (WCAC 2019)

Mjesto i datum
Istanbul, Turska, 23.09.2019. - 27.09.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
EC ; OC ; OC/EC ratio ; POC ; SOC

Sažetak
Rijeka is the principal seaport and third largest city in Croatia. The city's economy largely depends on shipbuilding and maritime transport. Rijeka has a humid subtropical climate with warm summers and relatively mild winters with frequent rainfall and cold (bura) winds. This study is the first on particulate matter with an equivalent aerodynamic diameter smaller than 2.5 μm (PM2.5) and the carbon content in it at a coastal urban background station. Mass concentrations of elemental (EC), organic (OC) and total carbon (TC) were investigated from January 1st 2017 to August 31st 2019. Sampling was conducted during 24- hour periods from approximately 55 m3 of ambient air on quartz fibre filters pre-fired at 850°C for 3 hours. Mass concentrations of 973 PM2.5 samples were determined gravimetrically according to the standard EN 12341:2014. Carbon content was measured by the thermal-optical transmittance method (TOT) using a carbon aerosol analyser with a flame ionization detector and EUSAAR_2 temperature program operating according to the standard EN 16909:2017. The average PM2.5 mass concentration (11.1 μg m-3) did not exceed the limit value of 25 μg m-3 and the maximum was observed in winter (51.3 μg m-3). Carbon mass concentrations revealed strong seasonality having its low in summer and high in winter. The average OC/EC mass ratio values of around 6.6 pointed to the influence of secondary organic aerosols. Average TC mass contribution to the total PM2.5 mass was 33 %, of which 20 % SOC (secondary OC), 7 % POC (primary OC) and 5 % EC. The high mass contribution of SOC to total OC mass (as much as 74 %) can be explained by the warm climate suitable for photochemical reactions and the formation of SOC from sea spray.

Izvorni jezik
Engleski

Znanstvena područja
Javno zdravstvo i zdravstvena zaštita

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