東京湾の多環芳香族炭化水素による汚染過程(<特集>東京湾)

概要

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Sediment samples collected from Tokyo Bay were analysed for polycyclic aromatic hydrocarbon (PAH), which was found to distribute vertically with subsurface maximum at 15-20 cm depth from the top of the core sample. The sediment showing such a maximum value of PAH was dated to be 1969-1972 by ^<210>Pb chronology. The distribution patterns of alkylated and non-alkylated groups of PAH from fossil oil, particules collected near the highway were examined to determine the source of PAH in the Tokyo Bay sediment. The results indicated that the combusion products of either wood and fossil fuels were most probable sources of the PAH found in the sediment from Tokyo Bay. PAH concentration was discussed with the chronological trends of the atmospheric particles and 3,4-benzopyrene concentration in Tokyo and Osaka areas for last 10 years. The enforcement of the ban of the emmision of the atmospheric particles from various sources such as the internal combusion systems, generators for the electric power supply and cake production etc. was not likely to cause the formation of the subsurface maximum of the PAH concentraiton of the sediment found in 1969-1972. Increase in PAH concentration of the sediment was found to coincide with time when rapid development of the industrialization occurred in the areas surrounding of Tokyo Bay after 1950s.
1983-05-30