140 years-long sedimentary records of PAHs and CN stable isotopes from Ninomiya River, Japan

Rodrigo Mundo, Hisanori Iwai, Shinya Ochiai, Tetsuya Matsunaka*, Noriko Hasebe, Seiya Nagao*

*この研究の対応する著者

研究成果: Article査読

抄録

Anthropogenic activities' impacts over 140 years were studied at West Nanao Bay using a variety of geochemical techniques on sedimentary records. The bay is influenced by the Ninomiya River which is fed by a small watershed at which Tatzuruhama Town is located. Sedimentation rate was calculated using 210Pb-excess and 137Cs activities. C/N decreased after 1975, indicating a decrease in lignin-rich organic matter. From δ13C, δ15N and biogenic silica it was indicated that the population increased sewage-discharges until the construction of waste-water treatment plant in 1986. Several recorded changes in the landuse matched with the variation of the particle size. Total PAHs concentration was 1.17–62.78 μg g−1, being highest during Japan's fastest economic growth period (1946–1975). Using diagnostic ratios and PCA analysis, PAHs' sources were identified as pyrogenic for all depths, varying from coal combustion (90.7 %) before 1946 to a mixture of biomass and vehicle combustion after 1961.

本文言語English
論文番号114943
ジャーナルMarine Pollution Bulletin
192
DOI
出版ステータスPublished - 2023 7月

ASJC Scopus subject areas

  • 海洋学
  • 水圏科学
  • 汚染

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