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

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

doi:10.1016/j.marpolbul.2014.10.019

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

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

Laboratory of Hydrosphere Sutainability Engineering

Research output: Contribution to journal › Article › peer-review

10 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 language	English
Pages (from-to)	112-120
Number of pages	9
Journal	Marine Pollution Bulletin
Volume	89
Issue number	1-2
DOIs	https://doi.org/10.1016/j.marpolbul.2014.10.019
Publication status	Published - Dec 15 2014

All Science Journal Classification (ASJC) codes

Oceanography
Aquatic Science
Pollution

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

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.",

author = "Matsuyama Akito and Yano Shinichiro and Hisano Akihiro and Kindaichi Michiaki and Sonoda Ikuko and Tada Akihide and Akagi Hirokatsu",

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AU - Akito, Matsuyama

AU - Shinichiro, Yano

AU - Akihiro, Hisano

AU - Michiaki, Kindaichi

AU - Ikuko, Sonoda

AU - Akihide, Tada

AU - Hirokatsu, Akagi

PY - 2014/12/15

Y1 - 2014/12/15

N2 - 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.

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