Chemical characteristics of size-resolved atmospheric aerosols in Iasi, north-eastern Romania: nitrogen-containing inorganic compounds control aerosol chemistry in the area
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Published:2018-04-26
Issue:8
Volume:18
Page:5879-5904
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Galon-Negru Alina Giorgiana,Olariu Romeo Iulian,Arsene Cecilia
Abstract
Abstract. This study assesses the effects of particle size and season on the content of
the major inorganic and organic aerosol ionic components in the Iasi urban
area, north-eastern Romania. Continuous measurements were carried out over
2016 using a cascade Dekati low-pressure impactor (DLPI) performing
aerosol size classification in 13 specific fractions over the
0.0276–9.94 µm size range. Fine-particulate Cl−,
NO3-, NH4+, and K+ exhibited clear minima during the warm
season and clear maxima over the cold season, mainly due to trends in
emission sources, changes in the mixing layer depth and specific
meteorological conditions. Fine-particulate SO42- did not show much
variation with respect to seasons. Particulate NH4+ and NO3-
ions were identified as critical parameters controlling aerosol chemistry in
the area, and their measured concentrations in fine-mode (PM2.5)
aerosols were found to be in reasonable good agreement with modelled values
for winter but not for summer. The likely reason is that NH4NO3
aerosols are lost due to volatility over the warm season. We found that
NH4+ in PM2.5 is primarily associated with SO42- and
NO3- but not with Cl−. Actually, indirect ISORROPIA-II
estimations showed that the atmosphere in the Iasi area might be ammonia rich
during both the cold and warm seasons, enabling enough NH3 to be present
to neutralize H2SO4, HNO3, and HCl acidic components and to
generate fine-particulate ammonium salts, in the form of
(NH4)2SO4, NH4NO3, and NH4Cl. ISORROPIA-II runs
allowed us to estimate that over the warm season ∼ 35 % of the
total analysed samples had very strongly acidic pH (0–3), a fraction that rose
to ∼ 43 % over the cold season. Moreover, while in the cold
season the acidity is mainly accounted for by inorganic acids, in the warm
ones there is an important contribution by other compounds, possibly organic.
Indeed, changes in aerosol acidity would most likely impact the
gas–particle partitioning of semi-volatile organic acids. Overall, we
estimate that within the aerosol mass concentration the ionic mass brings a
contribution as high as 40.6 %, with the rest still being unaccounted
for.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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