Radiocarbon apportionment of fossil versus biofuel combustion sources of polycyclic aromatic hydrocarbons in the Stockholm metropolitan area

TitleRadiocarbon apportionment of fossil versus biofuel combustion sources of polycyclic aromatic hydrocarbons in the Stockholm metropolitan area
Publication TypeJournal Article
Year of Publication2004
AuthorsMandalakis, M, Gustafsson, O, Reddy, CM, Xu, L
JournalEnviron Sci Technol
Volume38
Issue20
Pagination5344-9
Date PublishedOct 15
ISBN Number0013-936X (Print)0013-936X (Linking)
Keywords*Bioelectric Energy Sources, *Fossil Fuels, Biomass, Carbon Radioisotopes, Cities, Environmental Monitoring, Fresh Water, Geologic Sediments/*analysis, Polycyclic Aromatic Hydrocarbons/*analysis/isolation & purification, Sweden, Water Pollutants, Chemical/*analysis/isolation & purification
Abstract

Source-diagnostic markers and the isotopic composition of polycyclic aromatic hydrocarbons (PAHs) were examined in surface sediments from the greater Stockholm waterways to deduce the contribution from biomass sources to the environmental PAH load. The summed concentration of 20 PAHs ranged from 0.8 to 45.1 microg/g (dry weight) and exhibited a steep decline with increasing distance from the city center evidencing that sources within the metropolitan area of Stockholm dominate its PAH burden. Several diagnostic PAH ratios indicated an overwhelming predominance of pyrogenic sources over the petrogenic ones, while retene and 1,7-dimethylphenanthrene were unable to correctly evaluate the contribution from biomass combustion. The stable carbon isotope composition (delta13C) of individual PAHs ranged from -24.8 to -27.0% but also was proved inefficient to discriminate between different types of fuels due to the overlapping signals in various sources. The delta14C values of PAHs ranged between -550.4 and -934.1%, indicating a clear predominance of fossil fuel sources. By using an isotopic mass balance approach, we estimated that on average 17+/-9% of PAHs derived from biomass combustion. This radiocarbon apportionment, in conjunction with detailed energy statistics for the Stockholm region, revealed that the ambient PAH burden is roughly similar, per unit energy produced, from fossil fuels and biofuels. Societies' shifting energy policies toward a larger reliance on biofuels may thus not lead to further deterioration of air quality and respiratory ailments for the urban population.

URLhttps://www.ncbi.nlm.nih.gov/pubmed/15543735
DOI10.1021/es049088x