Mercury remobilization from flooded soils in a hydroelectric reservoir of northern Quebec, La Grande-2: results of a soil resuspension experiment

Mucci, Alfonso; Montgomery, Shelagh; Lucotte, Marc; Plourde, Yanick; Pichet, Pierre; Tra, Huu Van

doi:10.1139/f95-841

Cited by 70 publications

(39 citation statements)

References 60 publications

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“…For Dis-Hg analysis, 50 mL of each sample was oxidized with 500 mL of a saturated solution of potassium persulfate and by irradiation with a UV lamp (1000 W) for 30 min; following irradiation, the excess of oxidant was reduced with 37.5 mL of hydroxylamine solution 12% (w/v). 20 For the determination in SPM (SPM-Hg), the same equipment was used after digestion of the filters with HNO 3 4 mol L À1 . 17 Sediments (Sed-Hg) and L. aurata tissues samples were analysed for T-Hg by atomic absorption spectrometry (AAS) with thermal decomposition and gold amalgamation, using an Advanced Mercury Analyser (AMA) LECO 254.…”

Section: Mercury Analysismentioning

confidence: 99%

Mercury distribution in key tissues of fish (Liza aurata) inhabiting a contaminated estuary—implications for human and ecosystem health risk assessment

et al. 2009

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This study brings a new viewpoint based on multiple-tissue analyses to form the basis for a predictive mode of mercury accumulation dynamics in fish body under field conditions. Total mercury (T-Hg) was determined in key tissues of Liza aurata captured along an estuarine contamination gradient, displaying the following hierarchy: kidney > liver > muscle > brain > gills > blood. Brain was the tissue that better reflected the mercury contamination extent, closely followed by liver and muscle. Organic mercury (O-Hg) measured in muscle and liver represented more than 85% and less than 30% of the T-Hg, respectively. The lowest O-Hg percentage was found in the most contaminated area, for both muscle and liver. Mercury distribution and accumulation patterns showed dependence on the specific tissue. The high mercury levels found in organs involved in vital physiological processes point out the risk to autochthonous fish fauna. Human risk associated to the ingestion of fish living in the surveyed areas cannot be excluded.

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Section: Mercury Analysismentioning

confidence: 99%

Mercury distribution in key tissues of fish (Liza aurata) inhabiting a contaminated estuary—implications for human and ecosystem health risk assessment

et al. 2009

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“…No peak was detected when the blanks were analysed. The total dissolved mercury concentrations were determined after oxidation with potassium persulphate and ultraviolet radiation, as described by Mucci et al (1995). Non-reactive mercury was determined by the difference between total dissolved mercury and reactive mercury, and included all dissolved mercury species strongly bound to soluble complexes (Gill and Bruland, 1990).…”

Section: à3mentioning

confidence: 99%

Mercury cycling between the water column and surface sediments in a contaminated area

Ramalhosa

Segade²,

Pereira

et al. 2006

Water Research

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Sediments Pore waters Diffusion Largo do Laranjo A B S T R A C TMercury cycling in the water column and upper sediments of a contaminated area, the Largo do Laranjo, Aveiro (Portugal), was evaluated after determination of reactive and nonreactive mercury concentrations in the water column and pore waters of sediments, collected in several places of this bay. In the water column, reactive mercury concentrations varied between 10 and 37 pmol dm À3, the highest values being observed near the mercury anthropogenic source. However, reactive mercury was a narrowly constrained fraction of the total mercury, making up only 4-16% of the total, showing evidence of the importance of dissolved organic matter on mercury transport.In sediments, higher concentrations of mercury were also determined near industrial discharges. Results indicate the existence of an equilibrium between solid and liquid phases, determined by solid sediment/pore water distribution coefficients. Much of the mercury present in the solid fraction is associated with organic matter (r ¼ 0:837) and iron oxyhydroxides (r ¼ 0:919), but as oxides begin to dissolve in reduced sediments and organic matter decays, the adsorbed mercury is released. In fact, the mercury concentrations in pore waters of those contaminated sediments largely exceeded the values determined in the water column. As molecular diffusion may contribute to the dissolved mercury distribution in the overlying water column, this phenomenon was evaluated. However, the pore waters of Largo do Laranjo do not enrich the water column substantially in terms of reactive and non-reactive mercury. In fact, pore waters can contribute only to 0.2% and 0.5% of the reactive and non-reactive mercury present in the water column, respectively, showing that as long as mercury is being incorporated in sediments, it stays in stable forms.

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“…This analytical methodology is highly sensitive, allowing for the measurement of 1 ng L À1 of mercury. Dissolved reactive mercury was analysed directly in the acidified samples (Mucci et al, 1995).…”

Section: Water Samplesmentioning

confidence: 99%

Influence of bioturbation by Hediste diversicolor on mercury fluxes from estuarine sediments: A mesocosms laboratory experiment

Cardoso

Lillebø

Lopes

et al. 2008

Marine Pollution Bulletin

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Mercury, with its reactive forms being the most deleterious for the trophic chains, has been identified as a major pollutant in a few confined bodies of the coastal zone. Due to feeding, burrowing, and bioirrigation activities, infauna are known to play a crucial role in the biogeochemical processes of contaminants. The main goal of the present study is to evaluate the effects of Hediste diversicolor bioturbation on mercury fluxes from estuarine sediments in a mesocosms laboratory experiment. Additionally, an attempt was made to establish a relationship between the amount of remobilised mercury to the water column and the degree of contamination of the sediments using a mercury contamination gradient.The present experiment demonstrated that the bioturbation activity caused by the gallery-diffuser H. diversicolor did not influence the remobilisation of mercury (in dissolved reactive forms) from the sediment to the water column. The concentration of dissolved reactive mercury in the water column also did not reflect the degree of contamination in the sediments. The results obtained were in accordance with the sediment characteristics of the Mondego Estuary and Ria de Aveiro (Portugal), since they are very rich in organic matter content, iron/manganese total and hydrous oxides. These physicochemical characteristics of the sediments may partially justify the retention of mercury by these systems, even when they are subjected to bioturbation.In conclusion, sediments with high organic matter content and a high concentration of iron/manganese hydrous oxides allowed for efficient retention of mercury, and the bioturbation process did not seem to affect the system. Another conclusion from this study is that the remobilisation of mercury by bioturbation to the water column is not a fast process, requiring more than 24 h. This study constitutes an important work in the area of the effects of bioturbation on mercury remobilisation. Considering the toxicity of mercury for the biota, it is essential to evaluate the real magnitude of mercury processes occurring in estuarine systems in order to obtain essential information on metal behaviour.

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Mercury remobilization from flooded soils in a hydroelectric reservoir of northern Quebec, La Grande-2: results of a soil resuspension experiment

Cited by 70 publications

References 60 publications

Mercury distribution in key tissues of fish (Liza aurata) inhabiting a contaminated estuary—implications for human and ecosystem health risk assessment

Mercury distribution in key tissues of fish (Liza aurata) inhabiting a contaminated estuary—implications for human and ecosystem health risk assessment

Mercury cycling between the water column and surface sediments in a contaminated area

Influence of bioturbation by Hediste diversicolor on mercury fluxes from estuarine sediments: A mesocosms laboratory experiment

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