Journal article

Mass closure on the chemical species in size-segregated atmospheric aerosol collected in an urban area of the Po Valley, Italy

Matta E, Facchini M, Decesari S, Mircea M, Cavalli F, Fuzzi S, Putaud J, Dell'Acqua A ...see all

Atmos. Chem. Physics, vol. 3 (2003) pp. 623-637

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Abstract

A complete size segregated chemical characterisation was carried out
for aerosol samples collected in the urban area of Bologna over a
period of one year, using five-stage low pressure Berner impactors.
An original dual-substrate technique was adopted to obtain samples
suitable for a complete chemical characterisation. Total mass, inorganic,
and organic components were analysed as a function of size, and a
detailed characterisation of the water soluble organic compounds
was also performed by means of a previously developed methodology,
based on HPLC separation of organic compounds according to their
acid character and functional group analysis by Proton Nuclear Magnetic
Resonance. Chemical mass closure of the collected samples was reached
to within a few percent on average in the submicron aerosol range,
while a higher unknown fraction in the coarse aerosol range was attributed
to soil-derived species not analysed in this experiment. Comparison
of the functional group analysis results with model results simulating
water soluble organic compound production by gas-to-particle conversion
of anthropogenic VOCs showed that this pathway provides a minor contribution
to the organic composition of the aerosol samples in the urban area
of Bologna.

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Authors

  • E Matta

  • M C Facchini

  • S Decesari

  • M Mircea

  • F Cavalli

  • S Fuzzi

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