Compound-specific radiocarbon analysis of polycyclic aromatic hydrocarbons (PAHs) in sediments from an urban reservoir

Hirohide Kanke, Masao Uchida, Tomoaki Okuda, Minoru Yoneda, Hideshige Takada, Yasuyuki Shibata, Masatoshi Morita

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A quantitative apportionment of polycyclic aromatic hydrocarbons (PAHs) derived from fossil fuel combustion (14C-free) and biomass burning (contemporary 14C) was carried out using a recently developed compound-specific radiocarbon analysis (CSRA) method for a sediment core from an urban reservoir located in the central Tokyo metropolitan area, Japan. The 14C abundance of PAHs in the sediments was measured by accelerator mass spectrometry (AMS) after extraction and purification by three types of column chromatography, by high performance liquid chromatography (HPLC), and, subsequently, by a preparative capillary gas chromatography (PCGC) system. This method yielded a sufficient quantity of pure compounds and allowed a high degree of confidence in the determination of 14C. The fraction modern values (fM) of individual PAHs (phenanthrene, alkylphenanthrenes, fluoranthene, pyrene and benz[a]anthracene) in the sediments ranged from 0.06 to 0.21. These results suggest that sedimentary PAHs (those compounds mentioned above) were derived mostly from fossil fuel combustion. Three sectioned-downcore profiles (∼40 cm) of the 14C abundance in phenanthrene and alkylphenanthrenes showed a decreasing trend with depth, that was anti-correlated with the trend of ∑PAHs concentration. The fM values of phenanthrene were also larger than those of alkylphenanthrenes in each section of the core. This result indicates that phenanthrene received a greater contribution from biomass burning than alkylphenanthrenes throughout the core. This finding highlights the method used here as an useful approach to elucidate the source and origin of PAHs in the environment.

Original languageEnglish
Pages (from-to)545-554
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume223-224
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2004 Aug 1

Keywords

  • Compound-specific radiocarbon analysis
  • Polycyclic aromatic hydrocarbons
  • Sediment
  • Urban reservoir

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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