伊勢湾・三河湾における表層堆積物中多環芳香族炭化水素の分布

抄録

Seventeen polycyclic aromatic hydrocarbons (PAHs) including sixteen United States Environmental Protection Agency (US-EPA) priority PAHs and benzo[e]pyrene were measured in the surface sediments collected from Ise Bay and Mikawa Bay, Japan. The total concentrations of PAHs (ΣPAH17) in the surface sediments varied from 97 to 415 ng/g-dry weight (ng/g-dw), with average value of 274 ng/g-dw. PAHs concentrations were comparable with those of other polluted coastal sites worldwide. Grading analysis of sediment samples was performed to determine grain size distribution characteristics from which median grain size, d₅₀ were calculated. There is a comparatively good correlation between the ΣPAH17 concentrations and d₅₀ for surface sediments. The isomeric ratios of PAHs (Ant/ (Ant+Phen), BaA/ (BaA+Chrys), IP/ (IP+BghiP), Fla/ (Fla+Pyr) ) were calculated to evaluate the possible PAHs emission sources in the sediments. The results of isomeric ratios indicated that fossil fuel and biomass combustion (pyrogenic sources) are major sources of the PAHs.