Characterization
of an Asphalt Binder and Photoproducts
by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Reveals
Abundant Water-Soluble Hydrocarbons
Posted on 2020-07-08 - 14:37
Road
asphalt is comprised of aggregate (rocks) mixed with a binder
composed of high-boiling petroleum-derived compounds, which have been
thought to be relatively inert (unreactive) and thus leach small amounts
of polyaromatic hydrocarbons (PAHs) into water from the built environment.
However, recent studies have demonstrated that petroleum readily undergoes
photooxidation and generates water-soluble oxygen-containing hydrocarbons.
Therefore, here, we investigate the effects of solar irradiation on
an asphalt binder. Upon irradiation in a photooxidation microcosm,
thin films of the asphalt binder produce abundant oil- and water-soluble
oxygenated hydrocarbons, which we hypothesize are also leached from
roads and highways through photooxidation reactions. Ultrahigh-resolution
Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR
MS) enables extensive compositional characterization of the virgin
asphalt binder, irradiated asphalt binder, and the water-soluble photoproducts.
The results reveal the production of water-soluble species that resemble
the molecular composition of petroleum-derived dissolved organic matter,
including abundant hydrocarbons and S-containing species with up to
18 oxygen atoms. The results also confirm photo-induced oxidation,
fragmentation, and potentially polymerization as active processes
involved in the production of water-soluble organic pollutants from
asphalt.
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Niles, Sydney
F.; Chacón-Patiño, Martha L.; Putnam, Samuel P.; Rodgers, Ryan P.; Marshall, Alan G. (2020). Characterization
of an Asphalt Binder and Photoproducts
by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Reveals
Abundant Water-Soluble Hydrocarbons. ACS Publications. Collection. https://doi.org/10.1021/acs.est.0c02263
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AUTHORS (5)
SN
Sydney
F. Niles
MC
Martha L. Chacón-Patiño
SP
Samuel P. Putnam
RR
Ryan P. Rodgers
AM
Alan G. Marshall