放射性核種およびmolecular markerによる東京湾の堆積過程の解明

• 真田 幸尚

  東京農工大学農学部

• 佐藤 太

  東京農工大学農学部

• 熊田 英峰

  東京農工大学農学部

• 高田 秀重

  東京農工大学農学部

• 山本 愛

  東海大学海洋学部

• 加藤 義久

  東海大学海洋学部

• 上野 隆

  日本原子力研究所環境安全部

書誌事項

タイトル別名

• Estimation of sedimentation processes in Tokyo Bay using radionuclides and anthropogenic molecular markers
• ホウシャセイカクシュ オヨビ molecular marker ニ ヨル トウキョウワン ノ タイセキ カテイ ノ カイメイ

抄録

To estimate the sedimentation rate and to understand the sedimentation processes in Tokyo Bay, vertical distributions of ²¹⁰Pb and ¹³⁷Cs were determined for two sediment cores (F-2 and F-5) from Tokyo Bay and one from the moat of Imperial Palace for the Tokyo. Molecular stratigraphy was applied to one of the Tokyo Bay sediment cores using polychlorinated biphenyls (PCBs) and linear and tetrapropylene-based alkylbenzenes (LABs and TABs). ²¹⁰Pb showed exponential downcore decrease with substantial fluctuation. In the sediment core of the bay (F-2), radiocesium maximum, corresponding to the atmospheric deposition maximum at 1963, was observed. Good agreement between the deposition date estimated using radionuclides (¹³⁷Cs and ²¹⁰Pb) and the vertical distributions of PCBs, LABs and TABs, suggests the utility of multiple markers approach for sediment stratigraphy. In the Tokyo Bay sediments, only slight or negligible decrease in ¹³⁷Cs activity was observed toward the surface layer where significant amounts of ¹³⁷Cs was detected, whereas a sharp peak of ¹³⁷Cs were observed for the Moat which has no inflowing rivers. PCBs and TABs, whose productions and usage ceased by early 1970s, decreased gradually to the sediment-water interface in the Tokyo Bay and were found significantly in the surficial sediments. All these markers suggest that riverine and estuarine sediments play a role of a reservoir of the pollutants, that is, particle-reactive pollutants are temporally deposited and stored in riverine and estuarine sediments which are intermittently supplied to Tokyo Bay during flood events with resuspension.

収録刊行物

• 地球化学

  地球化学 33 (2), 123-138, 1999

  一般社団法人日本地球化学会

キーワード

• sedimentation rate
• ¹³⁷Cs
• ²¹⁰Pb
• Tokyo Bay
• molecular marker
• PCBs
• LABs

詳細情報

• CRID: 1390001205742548096
• NII論文ID: 110008679976
• NII論文ID: 10004547209
• NII書誌ID: AN00141280
• DOI: 10.14934/chikyukagaku.33.123
• ISSN: 21885923
• ISSN: 03864073
• NDL書誌ID: 4755871
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4755871
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可