Concentration of mercury species in relationship to other site‐specific factors in the surface waters of northern Wisconsin lakes

Watras, Carl J.; Morrison, K. A.; Host, Jodi S.; Bloom, Nicolas S.

doi:10.4319/lo.1995.40.3.0556

Cited by 208 publications

(127 citation statements)

References 29 publications

(30 reference statements)

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“…This finding is in agreement with previous data based on culture and the most probable number which identified SRB and FeRB in the Babeni Reservoir (Bravo et al 2014) as well as with another study showing SRB and FeRB coexistence in sediments (Yu et al 2012). The greatest methylation activity is often found just below the oxic/anoxic transition zone in sediments underlying oxygenated water (Watras et al 1995;Ullrich et al 2001;Bravo et al 2014). where both sulfate and iron reduction rates can be high.…”

Section: Discussion Dispersion and Fate Of Hg In Downstream Reservoirsmentioning

confidence: 99%

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Bravo

Loizeau

Dranguet

et al. 2015

Environ Sci Pollut Res

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Chlor-alkali plants using mercury (Hg) cell technology are acute point sources of Hg pollution in the aquatic environment. While there have been recent efforts to reduce the use of Hg cells, some of the emitted Hg can be transformed to neurotoxic methylmercury (MeHg). Here, we aimed (i) to study the dispersion of Hg in four reservoirs located downstream of a chlor-alkali plant along the Olt River (Romania) and (ii) to track the activity of bacterial functional genes involved in Hg methylation. Total Hg (THg) concentrations in water and sediments decreased successively from the initial reservoir to downstream reservoirs. Suspended fine size particles and seston appeared to be responsible for the transport of THg into downstream reservoirs, while macrophytes reflected the local bioavailability of Hg. The concentration and proportion of MeHg were correlated with THg, but were not correlated with bacterial activity in sediments, while the abundance of hgcA transcript correlated with organic matter and Cl− concentration, indicating the importance of Hg bioavailability in sediments for Hg methylation. Our data clearly highlights the importance of considering Hg contamination as a legacy pollutant since there is a high risk of continued Hg accumulation in food webs long after Hg-cell phase out

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Section: Discussion Dispersion and Fate Of Hg In Downstream Reservoirsmentioning

confidence: 99%

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Bravo

Loizeau

Dranguet

et al. 2015

Environ Sci Pollut Res

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show abstract

“…Natural accumulation of heavy metals in a lake environment (e.g. Watras et al 1995(from Bodaly et al 1993), Harris and Bodaly 1998); 2. High methylation rates within the bottom anoxic water layer of the lake caused by sulfur-reducing bacteria activity (Boudou et al 2006); 3.…”

Section: Fishmentioning

confidence: 99%

Mercury Levels in Pristine and Gold Mining Impacted Aquatic Ecosystems of Suriname, South America

Ouboter

Landburg

Quik³

et al. 2012

AMBIO

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Mercury levels in sediment and predatory fish were measured for 53 localities in Suriname. The average mercury level in bottom sediment surpassed the Canadian standard for sediment in most localities, except the coastal plains. Of the predatory fish, 41 % had a mercury level above the European Union standard for human consumption of 0.5 lg g -1 . Highest mercury levels were found in fish from the Brokopondo Reservoir and from the Upper Coppename River. High levels of mercury in fish in pristine areas are explained by atmospheric transportation of mercury with the northeastern trade winds followed by wet deposition. Contrary to gold mining areas, where mercury is bound to drifting sediments, in ''pristine'' areas the mercury is freely available for bio-accumulation and uptake. Impacts on piscivorous reptiles, birds, and mammals are unknown, but likely to be negative.

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“…Watras et al (1995b) found that on average, 80% of THg passed 0.45-mm filters in epilimnetic water from 23 lakes in Wisconsin. As already noted, organic matter decomposition would result in higher [THg] SE , provided that Hg is more conservative than the organic matter during sediment diagenesis.…”

Section: Thg In the Surface Sediment And The Settling Mattermentioning

confidence: 99%

Effects of ano×ia and sulfide on concentrations of total and methyl mercury in sediment and water in two Hg-polluted lakes

Regnell¹,

Helgée²,

Troedsson³

2001

Journal canadien des sciences halieutiques et aquatiques

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Between May and December 1996, monthly samples of surface sediment (0-1 cm), settling matter, and water were taken at a shallow site and a deep site in each of two consecutive Hg-polluted riverine lakes. In the upper lake, the sediment was polluted also with cellulose fiber. Both hypolimnia turned anoxic, but sulfide was detected only in the upper lake. When sulfide appeared, hypolimnetic methyl mercury (MeHg) increased and reached 47 pM (9.4 ng·L -1 ), whereas MeHg in the sediment below decreased. The increase in hypolimnetic inorganic Hg (IHg = total Hg -MeHg), which reached a peak of 40 pM (8.0 ng·L -1 ), was slower, possibly because mobilized IHg was methylated. In the lower lake, hypolimnetic MeHg and IHg increased less dramatically during summer stratification, reaching only 5 and 24 pM (1.0 and 4.8 ng·L -1 ), respectively. There was no detectable concomitant decrease in sediment MeHg. In both lakes, MeHg appeared to increase simultaneously with total Fe and Mn in the hypolimnion, as did IHg in the lower lake. Our observations suggest that the presence of hydrous ferric and manganese oxides decreased the mobility of Hg in both lakes but increased MeHg production in the upper lake.

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Concentration of mercury species in relationship to other site‐specific factors in the surface waters of northern Wisconsin lakes

Cited by 208 publications

References 29 publications

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Persistent Hg contamination and occurrence of Hg-methylating transcript (hgcA) downstream of a chlor-alkali plant in the Olt River (Romania)

Mercury Levels in Pristine and Gold Mining Impacted Aquatic Ecosystems of Suriname, South America

Effects of ano×ia and sulfide on concentrations of total and methyl mercury in sediment and water in two Hg-polluted lakes

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