| Sažetak | Istražena je vremenska varijabilnost u vodi topljivog organskog ugljika (WSOC) i površinski aktivnih tvari (PAT) u atmosferskim aerosolima, uzorkovanim u gradu Zagrebu, 2011/2012. godine (N = 104). Srednje koncentracije WSOC u zimu, jesen, proljeće i ljeto, imale su sljedeće vrijednosti: 11,60 ± 5,41, 10,70 ± 6,31, 4,77 ± 1,29 i 4,33 ± 1,62 μg m-3. Niže vrijednosti PAT izmjerene su u proljeće i ljeto: 0,71 ± 0,24 i 0,55 ± 0,20 μg m-3 ekv. Triton-X-100, a više vrijednosti izmjerene su u jesen i zimu: 3,34 ± 1,43 i 2,65 ± 0,86 μg m-3 ekv. Triton-X-100. Hidrofobna frakcija WSOC bila je dominantna tijekom hladnije sezone, dok je u toplijem razdoblju dominirao hidrofilni organski materijal. Na temelju dobivenih AC voltametrijskih krivulja, površinske aktivnosti su normalizirane na sadržaj organskog ugljika i učinaka PAT na redoks procese iona olova i kadmija, zaključeno je da HULIS materijal, fulvinske kiseline i proteini, mogu igrati važnu ulogu u atmosferskim aerosolima u toplijoj sezoni, dok masne kiseline i anionski tenzidi kao što je NaDBS, mogu biti dominantne tvari u aerosolima u hladnijoj sezoni. |
| Sažetak (engleski) | Abstract: The temporal distributions of water-soluble organic carbon (WSOC) and surface active substances (SAS) of PM10 atmospheric aerosols over the city of Zagreb, from autumn 2011. to summer 2012. (N = 104), were estimated. It was found that the average WSOC concentrations in winter,autumn, spring and summer were: 11,60 ± 5,41 (average ± standard deviation), 10.70 ± 6.31, 4.77 ± 1.29 and 4.33 ± 1.62 μg m-3. The lower SAS values were measured in spring and summer: 0.71 ± 0.24 , 0.55 ± 0.20 μg m-3 eq. Triton-X-100 and the higher values were measured in autumn and winter: 3.34 ± 1.43, 2.65 ± 0.86 μg m-3 eq. Triton-X-100. The hydrophobic WSOC was the dominant fraction during the cold season (autumn /winter), while in the warmer period (spring/summer) dominated hydrophilic fraction. On the basis of the obtained AC voltammetric curves and the surfactant activity normalized to the organic carbon content and the effect of SAS on the redox processes of lead and cadmium ions as electrochemical tools, it is concluded that macromolecular compounds, including HULIS matter, fulvic acid and proteins may play an important role in atmospheric aerosols during warm season while fatty acids and anionic surfactant as here presented by NaDBS, could be dominant substances in aerosols in the cold season. |
