Reevaluation of Minamata Bay, 25 years after the dredging of mercury-polluted sediments

Matsuyama Akito, Shinichiro Yano, Hisano Akihiro, Kindaichi Michiaki, Sonoda Ikuko, Tada Akihide, Akagi Hirokatsu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A detailed investigation of mercury concentrations in the bottom sediments of Minamata Bay was performed in May, 2012. A total of 691 sediment samples were obtained from 107 sampling points in the bay. The weighted average total mercury concentration and the total mass of mercury in the bottom sediments of Minamata Bay were estimated to be 2.3. mg/kg dry weight basis and 3.4. tons, respectively. The average concentration of total mercury in the surface layer of the sediments was 3.0. mg/kg dry weight basis, and the distribution pattern of total mercury concentrations in the surface layer was found to have changed little in comparison to results reported 25. years ago. In addition, based on the results of seawater monitoring in Minamata Bay from 2010 to 2012, the amounts of total mercury and methylmercury mobilized from sediments and dissolved in the water column were 0.7 and 0.1. kg/yr, respectively.

Original languageEnglish
Pages (from-to)112-120
Number of pages9
JournalMarine Pollution Bulletin
Volume89
Issue number1-2
DOIs
Publication statusPublished - Dec 15 2014

Fingerprint

Dredging
dredging
Mercury
mercury
Sediments
sediments
sediment
surface layer
Weights and Measures
methylmercury compounds
Seawater
methylmercury
Sampling
seawater
water column
Monitoring
sampling
Water
monitoring
water

All Science Journal Classification (ASJC) codes

  • Aquatic Science
  • Oceanography
  • Pollution
  • Medicine(all)

Cite this

Reevaluation of Minamata Bay, 25 years after the dredging of mercury-polluted sediments. / Akito, Matsuyama; Yano, Shinichiro; Akihiro, Hisano; Michiaki, Kindaichi; Ikuko, Sonoda; Akihide, Tada; Hirokatsu, Akagi.

In: Marine Pollution Bulletin, Vol. 89, No. 1-2, 15.12.2014, p. 112-120.

Research output: Contribution to journalArticle

Akito, M, Yano, S, Akihiro, H, Michiaki, K, Ikuko, S, Akihide, T & Hirokatsu, A 2014, 'Reevaluation of Minamata Bay, 25 years after the dredging of mercury-polluted sediments', Marine Pollution Bulletin, vol. 89, no. 1-2, pp. 112-120. https://doi.org/10.1016/j.marpolbul.2014.10.019
Akito, Matsuyama ; Yano, Shinichiro ; Akihiro, Hisano ; Michiaki, Kindaichi ; Ikuko, Sonoda ; Akihide, Tada ; Hirokatsu, Akagi. / Reevaluation of Minamata Bay, 25 years after the dredging of mercury-polluted sediments. In: Marine Pollution Bulletin. 2014 ; Vol. 89, No. 1-2. pp. 112-120.
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