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@article{1409133,
author = {Voliotis, Aristeidis and Prokeš, Roman and Lammel, Gerhard and Samara, Constantini},
article_location = {OXFORD},
article_number = {October},
doi = {http://dx.doi.org/10.1016/j.atmosenv.2017.07.024},
keywords = {Aerosols; HULIS Ionic species; FTIR functional group analysis; UV-Vis light absorption; WSOC},
language = {eng},
issn = {1352-2310},
journal = {Atmospheric Environment},
title = {New insights on humic-like substances associated with wintertime urban aerosols from central and southern Europe: Size-resolved chemical characterization and optical properties},
url = {https://www.sciencedirect.com/science/article/pii/S135223101730465X?via%3Dihub},
volume = {166},
year = {2017}
}
TY - JOUR
ID - 1409133
AU - Voliotis, Aristeidis - Prokeš, Roman - Lammel, Gerhard - Samara, Constantini
PY - 2017
TI - New insights on humic-like substances associated with wintertime urban aerosols from central and southern Europe: Size-resolved chemical characterization and optical properties
JF - Atmospheric Environment
VL - 166
IS - October
SP - 286-299
EP - 286-299
PB - PERGAMON-ELSEVIER SCIENCE LTD
SN - 13522310
KW - Aerosols
KW - HULIS Ionic species
KW - FTIR functional group analysis
KW - UV-Vis light absorption
KW - WSOC
UR - https://www.sciencedirect.com/science/article/pii/S135223101730465X?via%3Dihub
L2 - https://www.sciencedirect.com/science/article/pii/S135223101730465X?via%3Dihub
N2 - Although Humic-Like Substances (HULIS) are important contributors to the mass of organic aerosol in airborne particulate matter (PM), little is known about their chemical composition, while, their size resolved optical properties have not been studied yet. Here, HULIS fractions were isolated from size resolved aerosol samples (<= 0.49, 0.49-0.95, 0.95-3 and 3-10 mu m) collected in urban and suburban environments of four European cities during wintertime. The bulk (i.e., sum of all size fractions) concentration of HULIS ranged between 1.29 and 2.80 mu g m(-3) across sites with highest values in the <= 0.49 pm particle size fraction. The contribution of the carbon mass of HULIS (HULIS-C) to the watersoluble organic carbon content (WSOC) of PM was 32-43%, which is typical for urban sites affected by biomass burning. The Mass Absorption Efficiency (MAE), which characterizes the efficiency of absorbing solar energy per carbon mass of HULIS decreased with particle size, suggesting that the finest size fractions contain more light-absorbing chromophores, which could affect the light-absorbing ability of organic aerosols. The good correlation of HULIS with effective biomass tracers such as K+, as well as with secondary inorganic aerosol components, proposed that HULIS had both primary (i.e., biomass burning) and secondary sources. The Fourier Transfer Infrared coupled to Attenuation Total Reflectance (FTIR-ATR) spectra demonstrated prevalence of aromatic over carboxylic functional groups in most HULIS fractions, indicating contribution from coal combustion emissions in addition to fresh biomass burning.
ER -
VOLIOTIS, Aristeidis, Roman PROKEŠ, Gerhard LAMMEL and Constantini SAMARA. New insights on humic-like substances associated with wintertime urban aerosols from central and southern Europe: Size-resolved chemical characterization and optical properties. \textit{Atmospheric Environment}. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2017, vol.~166, October, p.~286-299. ISSN~1352-2310. Available from: https://dx.doi.org/10.1016/j.atmosenv.2017.07.024.
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