Mercury speciation in the water of Minamata Bay, Japan

Akito Matsuyama, Tomomi Eguchi, Ikuko Sonoda, Akihide Tada, Shinichirou Yano, Akira Tai, Kohji Marumoto, Takashi Tomiyasu, Hirokatsu Akagi

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The speciation of mercury (Hg) in Minamata Bay (Japan) was studied over a 2-year period (2006-2008). Concentrations of dissolved total Hg, dissolved methylmercury (MeHg), particulate total Hg, and suspended solids were 0.43±0.14 ng/l (mean±standard deviation), 0.10±0.06 ng/l, 3.04±2.96 ng/l, and 5.94± 2.10 mg/l, respectively. Correlations between concentrations of particulate total Hg and suspended solids at four depths (surface: 0 m; mid-depth: -6 m,-10 m; and bottom +1 m layer) were only significant in the bottom +1 m layer. The mean dissolved MeHg concentration and the ratio of dissolved MeHg to dissolved total Hg were considerably higher in summer compared to other seasons. The data suggest that bottom sediment was not the sole source of MeHg, and that MeHg may be produced in the water column by the conversion of divalent Hg eluted from resuspended bottom sediment. The correlation between seawater characteristics such as salinity, temperature, dissolved oxygen (DO), and dissolved MeHg concentration indicates that Hg methylation could be influenced by the heterotrophic activity of microorganisms in the seawater. In particular, inverse correlations were observed between DO, salinity, and MeHg concentration. However, dissolved MeHg concentrations did not correlate with seawater characteristics such as pH or chlorophyll-a.

Original languageEnglish
Pages (from-to)399-412
Number of pages14
JournalWater, Air, and Soil Pollution
Volume218
Issue number1-4
DOIs
Publication statusPublished - Jun 1 2011

Fingerprint

Mercury
Seawater
Dissolved oxygen
seawater
Water
dissolved oxygen
Sediments
salinity
Methylation
methylation
methylmercury
Chlorophyll
Microorganisms
water
sediment
chlorophyll a
microorganism
water column
summer
mercury

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Ecological Modelling
  • Water Science and Technology
  • Pollution

Cite this

Mercury speciation in the water of Minamata Bay, Japan. / Matsuyama, Akito; Eguchi, Tomomi; Sonoda, Ikuko; Tada, Akihide; Yano, Shinichirou; Tai, Akira; Marumoto, Kohji; Tomiyasu, Takashi; Akagi, Hirokatsu.

In: Water, Air, and Soil Pollution, Vol. 218, No. 1-4, 01.06.2011, p. 399-412.

Research output: Contribution to journalArticle

Matsuyama, A, Eguchi, T, Sonoda, I, Tada, A, Yano, S, Tai, A, Marumoto, K, Tomiyasu, T & Akagi, H 2011, 'Mercury speciation in the water of Minamata Bay, Japan', Water, Air, and Soil Pollution, vol. 218, no. 1-4, pp. 399-412. https://doi.org/10.1007/s11270-010-0654-z
Matsuyama, Akito ; Eguchi, Tomomi ; Sonoda, Ikuko ; Tada, Akihide ; Yano, Shinichirou ; Tai, Akira ; Marumoto, Kohji ; Tomiyasu, Takashi ; Akagi, Hirokatsu. / Mercury speciation in the water of Minamata Bay, Japan. In: Water, Air, and Soil Pollution. 2011 ; Vol. 218, No. 1-4. pp. 399-412.
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