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Publication - Dr Timothy Knowles

    Source Apportionment of Polycyclic Aromatic Hydrocarbons in Central European Soils with Compound-Specific Triple Isotopes (δ13C, Δ14C, and δ2H)

    Citation

    Bosch, C, Andersson, A, Kruså, M, Bandh, C, Hovorková, I, Klánová, J, Knowles, TDJ, Pancost, RD, Evershed, RP & Gustafsson, &#x, 2;015, ‘Source Apportionment of Polycyclic Aromatic Hydrocarbons in Central European Soils with Compound-Specific Triple Isotopes (δ13C, Δ14C, and δ2H)’. Environmental Science and Technology, vol 49., pp. 7657-7665

    Abstract

    This paper reports the first study applying a triple-isotope approach
    for source apportionment of polycyclic aromatic hydrocarbons (PAHs). The
    13C/12C, 14C/12C, and 2H/1H
    isotope ratios of PAHs were determined in forest soils from mountainous
    areas of the Czech Republic, European Union. Statistical modeling
    applying a Bayesian Markov chain Monte Carlo (MCMC) framework to the
    environmental triple isotope PAH data and an end-member PAH isotope
    database allowed comprehensive accounting of uncertainties and
    quantitative constraints on the PAH sources among biomass combustion,
    liquid fossil fuel combustion, and coal combustion at low and high
    temperatures. The results suggest that PAHs in this central European
    region had a clear predominance of coal combustion sources (75 ± 6%;
    uncertainties represent 1 SD), mainly coal pyrolysis at low temperature
    (∼650 °C; 61 ± 8%). Combustion of liquid fossil fuels and biomass
    represented 16 ± 3 and 9 ± 3% of the total PAH burden (∑PAH14),
    respectively. Although some soils were located close to potential PAH
    point sources, the source distribution was within a narrow range
    throughout the region. These observation-based top-down constraints on
    sources of environmental PAHs provide a reference for both improved
    bottom-up emission inventories and guidance for efforts to mitigate PAH
    emissions.

    Full details in the University publications repository