The contents and chemical forms of mercury in sediments from Kagoshima Bay, in comparison with Minamata Bay and Yatsushiro Sea, southwestern Japan.

Sakamoto, Hayao; Tomiyasu, Takashi; Yonehara, Norinobu

doi:10.2343/geochemj.29.97

Cited by 34 publications

(6 citation statements)

References 7 publications

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“…The pH was measured in distilled water using a solid/liquid ratio of 1:2 according to the method of the Canadian Society of Soil Science (Carter, 1993) using a pH electrode (with single‐junction Ag/AgCl reference; Accumet 13‐620‐285). Moisture content was determined at 45°C to minimize Hg volatilization (Sakamoto et al, 1995). Volatile solids were determined at 550°C according to Karam (1993) For TC, TS, and TOC analysis, samples were ground to powder for homogenization and then analyzed by high temperature combustion with an induction furnace (LECO, St. Joseph, MI).…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Two In Vitro Protocols for Determination of Mercury Bioaccessibility: Influence of Mercury Fractionation and Soil Properties

Welfringer

Zagury

2009

J of Env Quality

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Soil ingestion by children can be a significant exposure pathway to mercury (Hg). Unfortunately, no reliable in vivo results for Hg oral bioavailability determination in soils have been published. In vitro extractions enable the assessment of metals' bioaccessibility, which is an estimate of oral bioavailability. Therefore, the goal of this study was to evaluate two in vitro protocols (CDM (Camp Dresser and Mc Kee Inc.) and IVG (In Vitro Gastrointestinal)) for determination of Hg bioaccessibility in soils using pure Hg-compounds, reference materials (CRM 025-050 and ERM-CC580), and field-collected soils with elevated Hg concentrations. The influence of Hg fractionation and soil properties on Hg bioaccessibility was also investigated. In the field-collected soils, IVG bioaccessibility ranged from 1.5 to 7.5%, and was always below 3.15%, using the CDM method. Mercury bioaccessibility in CRM 025-050 was 61.5 and 34.7%, using IVG and CDM protocols, respectively, whereas Hg bioaccessibility was much lower in the certified sediment sample ERM-CC580 (<7%). Overall, the CDM protocol resulted in lower Hg bioaccessibility values. The water-soluble and exchangeable Hg fraction was highly correlated with gastrointestinal bioaccessibility (r=0.99, p<0.001 for both methods) and this fraction could be a potentially good indicator of Hg bioaccessibility. Because the IVG method is less time-consuming than the CDM protocol and includes organic physiological components which seem to increase Hg bioaccessibility, it might be preferred for determination of Hg bioaccessibility.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Two In Vitro Protocols for Determination of Mercury Bioaccessibility: Influence of Mercury Fractionation and Soil Properties

Welfringer

Zagury

2009

J of Env Quality

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“…13 Even though Minamata Bay has been subject to severe mercury pollution in the past, only some data on mercury analysis and speciation in environmental samples have been published. [15][16][17][18][19] The data obtained in this study, therefore, are of special importance in order to assess the level of contamination of Minamata Bay waters after more than 30 years of extensive remediation actions. The results presented in Tables 1 and 2 reveal that mercury in the seawater of Minamata Bay is at higher concentrations than at non-affected stations (sampling points 4, Outside Minamata Bay, and 5, Yunoko Bay; Fig.…”

Section: Resultsmentioning

confidence: 99%

Determination of total mercury and monomethylmercury compounds in water samples from Minamata Bay, Japan: an interlaboratory comparative study of different analytical techniques

Logar

Horvat

Akagi

et al. 2001

Applied Organom Chemis

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Concentration levels of mercury and its organic compounds in natural water samples are very low, so accurate analysis is still a major problem. To ensure the validity of such measurements a proper quality control/quality assurance programme should be implemented. In the absence of reference materials, the best way to check the accuracy of the results is through interlaboratory comparisons and comparisons of the results obtained by different analytical methods. The purpose of the present work was to compare independent analytical techniques used by two different laboratories for determination of total mercury (Hg-T) and monomethylmercury compounds (MeHg) in seawater samples from Minamata Bay, Japan. The interlaboratory study was carried out between the Jožef Stefan Institute,

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“…In the soil profile the contribution of residual mercury was found to increase with the depth of the profile, from 8.1% in the surface layer (0-30 cm) to 69% at 50-80 cm (Lechler et al 1997). High contributions of mercury bound to sulphides, mean 71.4% (range 38-96), were found in bottom sediments from the Kogushima Bay (Japan), where mercury sulphide is formed from H 2 S and mercury chloride is liberated from fumarole gasses released from the sea bottom (Sakamoto et al 1995).…”

Section: Sulphide Mercury Fractionmentioning

confidence: 97%

Mercury fractionation in sediments of the Lower Vistula River (Poland)

Boszke

Kowalski²

2007

Oceanological and Hydrobiological Studies

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The Vistula is the second largest river in the Baltic Sea catchment area and provides one of the main inputs to the Baltic. The river and its tributaries flow through some of the major industrialized and urbanised regions of Poland, making it one of the most highly human-impacted rivers in Europe. Although the river status is monitored routinely, little is known about mercury forms in the sediments. This study examines mercury fractionation in the sediments of the lower part of the Vistula River. The results show that the cities along this stretch of river have a relatively low impact on both the mercury forms found in the sediment and its bioavailability in the floodplain soils. The mean concentration of total mercury in the sediments was 65 ±14 ng g 80(68 ±11%, range 55-82%) and humic matter (19 ±10%, range 10-35%), with lower fractions of water-soluble mercury (6.9 ±2.9%, range 5.1-13%) and organomercury compounds (6.4 ±5.3%, range 0.6-13%). The least abundant fraction observed was acid-soluble mercury (0.3 ±0.2%, range 0.1-0.6%). Similar concentrations and fractionation were observed in floodplain soils from Kiezmark, collected 1, 10 and 50 meters from the riverbed.

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The contents and chemical forms of mercury in sediments from Kagoshima Bay, in comparison with Minamata Bay and Yatsushiro Sea, southwestern Japan.

Cited by 34 publications

References 7 publications

Evaluation of Two In Vitro Protocols for Determination of Mercury Bioaccessibility: Influence of Mercury Fractionation and Soil Properties

Evaluation of Two In Vitro Protocols for Determination of Mercury Bioaccessibility: Influence of Mercury Fractionation and Soil Properties

Determination of total mercury and monomethylmercury compounds in water samples from Minamata Bay, Japan: an interlaboratory comparative study of different analytical techniques

Mercury fractionation in sediments of the Lower Vistula River (Poland)

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