Concentrations and Distribution of Mercury and Other Heavy Metals in Surface Sediments of the Yatsushiro Sea including Minamata Bay, Japan

Nakata, Haruhiko; Shimada, Hideaki; Yoshimoto, M.; Narumi, Rika; Akimoto, Kazumi; Yamashita, Takayuki; Matsunaga, Takuro; Nishimura, Keisuke; Tanaka, Masakazu; Hiraki, Kenju; Shimasaki, Hideyuki; Takikawa, Kiyoshi

doi:10.1007/s00128-007-9320-6

Cited by 19 publications

(15 citation statements)

References 12 publications

(19 reference statements)

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“…5). Moreover, the total Hg concentration in the surface sediment in Minamata Bay (Nakata et al 2008) and in the SS observed here was similar, as discussed in Section 3.3. Based on these results, assuming that the physicochemical properties of SS near the sea bottom are uniform, and that some part of the diss-THg is derived from resuspended sediment, we obtain a partial explanation of our observations regarding the bottom sea layer.…”

Section: Influences Of Ss Characteristics and Particulate-thg On The supporting

confidence: 84%

“…1 Seawater sampling sites in Minamata Bay tion. Tomiyasu et al (2008) characterized the geographical distribution of Hg concentrations in the bottom sediment and bottom seawater, and Nakata et al (2008) studied the distribution of total Hg concentrations in surface sediments in Minamata Bay. Only Logar et al (2001) reported the seasonal variations, vertical distribution, and solid/liquid partitioning of Hg in the water column of Minamata Bay.…”

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confidence: 99%

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Mercury Speciation in the Water of Minamata Bay, Japan

Matsuyama

Eguchi

Sonoda

et al. 2010

Water Air Soil Pollut

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The speciation of mercury (Hg) in Minamata Bay (Japan) was studied over a 2-year period (2006)(2007)(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.

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Section: Influences Of Ss Characteristics and Particulate-thg On The supporting

confidence: 84%

mentioning

confidence: 99%

Mercury Speciation in the Water of Minamata Bay, Japan

Matsuyama

Eguchi

Sonoda

et al. 2010

Water Air Soil Pollut

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“…Nakata et al [79] investigated concentrations and distribution of heavy metals, such as Hg, zinc, copper, lead, and iron in surface sediments from 234 stations of the Yatsushiro Sea including Minamata bay. High concentrations of Hg were found in sediments from Minamata bay and its vicinity, but the levels decreased gradually with distance from the bay.…”

Section: Mercury Contaminated Sites Inmentioning

confidence: 99%

Mercury pollution in Asia: A review of the contaminated sites

Feng

Qiu

et al. 2009

Journal of Hazardous Materials

377

137

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“…Recently, Snyder (2012) 9) mentioned that the Asahi Shinbun reported that between January 2005 and June 2010 around 568 people who live in the designated area for relief measures in Amakusa region, the western part of Yatsushiro Sea, plus 160 people who live outside of the designated area have shown similar symptoms with Minamata Disease patients 9) . Another evidence of mercury transport from Minamata Bay to the Yatsushiro Sea was reported by Nakata et al (2008) 10) . They observed in the Yatsushiro Sea, the background Hg concentration in sediment from 0.1 ppm has increased to more than 0.4 ppm, especially in the southern part of Yatsushiro Sea 10) .…”

Section: Introductionmentioning

confidence: 92%

“…Another evidence of mercury transport from Minamata Bay to the Yatsushiro Sea was reported by Nakata et al (2008) 10) . They observed in the Yatsushiro Sea, the background Hg concentration in sediment from 0.1 ppm has increased to more than 0.4 ppm, especially in the southern part of Yatsushiro Sea 10) . By those reports above, it can be assumed that the sediment transport still occurs from remaining Hg concentration in Minamata Bay to the Yatsushiro Sea even after the dredging and reclamation projects.…”

Section: Introductionmentioning

confidence: 92%

Impact of Reclamation Project on Mercury-Contaminated Sediment Transport from Minamata Bay into the Yatsushiro Sea

Fathya

Yano²,

Matsuyama

et al. 2016

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal E

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Minamata Bay which suffered from a major disaster called "Minamata Disease" has already remediated from 1977 to 1990 by carried out highly mercury (Hg) contaminated sediment and reclaimed it in the bay area. Furthermore, many studies reported that the mercury has reached Yatsushiro Sea, the outer part of Minamata Bay. It can be assumed that the sediment transport still occurs from remaining Hg concentration even after the remediation project. In order to investigate it, we try to simulate the transport of sediment contaminated by Hg from Minamata Bay to the Yatsushiro Sea with different coastal morphology on before and after the reclamation projects.Sediment transport and tidal flow with rectangular variable grid both before and after reclamation conditions around the Yatsushiro Sea and Minamata Bay are simulated by DELFT3D. The initial bottom sediment thickness of 1m is set in the only inner side of the bay and six months simulation results for both before and after reclamation area are compared. The change of hydrodynamic condition inside Minamata Bay due to the remediation project gives a slight change in sediment transport pattern. It is estimated that after the reclamation, the sediment transport moves slower than before it due to the change of its magnitude of velocity above the seabed. As an important result, it is clarified that a change of the amount of bottom sediment which can be re-suspended in Minamata Bay caused by the topographical change can also affect the pattern. Also, this result suggests that the southern part of Yatsushiro Sea can be influenced by sediment contaminated by higher Hg included before the reclamation project.

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Concentrations and Distribution of Mercury and Other Heavy Metals in Surface Sediments of the Yatsushiro Sea including Minamata Bay, Japan

Cited by 19 publications

References 12 publications

Mercury Speciation in the Water of Minamata Bay, Japan

Mercury Speciation in the Water of Minamata Bay, Japan

Mercury pollution in Asia: A review of the contaminated sites

Impact of Reclamation Project on Mercury-Contaminated Sediment Transport from Minamata Bay into the Yatsushiro Sea

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