Methylmercury in Some Swedish Surface Waters

Lee, Ying-Hua; Hultberg, Hans

doi:10.1897/1552-8618(1990)9[833:misssw]2.0.co;2

Cited by 10 publications

(18 citation statements)

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“…à References: 1, this study; 2, Gill and Bruland (1990);3, Gill and Bruland (1992);4, Bonzongo et al (1996);5, Henry et al (1995);6, Jacobs et al (1995);7, Bloom and Effler (1990);8, Parks et al (1989);9, Jackson (1986); 10, Cossa and Gobeil (2000); 11, Quemerais et al (1999);12, Horvat et al (2003); 13, Kotnik et al (2002);14, Watras et al (1995a);15, Watras et al (1995b);16, Watras et al (1998);17, Sullivan and Mason (1998);18, Monson and Brezonik (1998);19, Driscoll et al (1994);20, Wong et al (1997);21, Vaidya and Howell (2002); 22, Lee and Hultberg (1990). 0.486, and 0.560 mg/kg, respectively. Clear Lake sediments at sites far distant from the mine, with TotHg concentrations of ;1 mg/kg or less, exceed the TEL by ;10 times and exceed the PEL and UET toxic criteria by a factor of approximately two to three.…”

Section: Ecological Health Criteriamentioning

confidence: 99%

Mercury in Abiotic Matrices of Clear Lake, California: Human Health and Ecotoxicological Implications

Suchanek

Eagles‐Smith

Slotton

et al. 2008

Ecological Applications

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Abstract. Mercury (Hg) from Hg mining at Clear Lake, California, USA, has contaminated water and sediments for over 130 years and has the potential to affect human and environmental health. With total mercury (TotHg) concentrations up to 438 mg/kg (dry mass) in surficial sediments and up to 399 ng/L in lake water, Clear Lake is one of the most Hg-contaminated lakes worldwide. Particulate Hg in surface water near the mine ranges from

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Section: Ecological Health Criteriamentioning

confidence: 99%

Mercury in Abiotic Matrices of Clear Lake, California: Human Health and Ecotoxicological Implications

Suchanek

Eagles‐Smith

Slotton

et al. 2008

Ecological Applications

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“…Recent studies have observed enhanced bioaccumulation ofmercury, cadmium, and lead by fish living in low pH surface waters (44)(45)(46). Studies of mercury, in particular, have found elevated levels ofmethylmercury in fish from low pH lakes.…”

Section: Global Warming and Indoor Air Qualitymentioning

confidence: 99%

Global atmospheric changes.

Piver

1991

Environ Health Perspect

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Increasing concentrations ofCO2 and other greenhouse gases in the atmosphere can be directly related to global warming. In terms ofhuman health, because a major cause ofincreasing atmospheric concentrations of CO2 is the increased combustion of fossil fuels, global warming also may result in increases in air pollutants, acid deposition, and exposure to ultrviolet (UV) radiation. Tb undestand better the impacts ofgob warming phenomena on human health, this review emphasizes the processes that are responsible for the greenhouse effect, air poflution, acid deposition, and increased exposure to UV radiation.

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“…. Thiols have been shown to play an important role in controlling the bioavailability of trace metals (Boulegue et al 1982;Matrai 1988;Lee and Hultberg 1990;Leal et al 1999;Harris et al 2003) and other toxic compounds in aquatic environments through complexation reactions (Cullen et al 1984;Hu et al 2006). Reduced organic sulfur (ROS) is more abundant than mercury found in most aquatic environments (Xia et al 1999).…”

Section: Discussionmentioning

confidence: 99%

“…For example, results indicate that thiol groups are involved in the strong complexation of mercury with humic substances (Jackson et al 1980;Lee and Hultberg 1990;Hintelmann and Wilken 1995;Hintelmann et al 1997). Spectroscopic investigations have provided direct evidence of mercury binding to ROS groups in organic matter (Ravichandran 2004).…”

Section: Interaction Of Inorganic Mercury With Reduced Organic Sulfurmentioning

confidence: 99%

“…Among the numerous organic sulfur compounds, organic sulfhydryls (R-SH) are especially important in biogeochemical cycling of metals in marine and freshwater ecosystems because of the high reactivity of the sulfhydryl group toward metals . Thiols have been shown to play an important role in controlling the bioavailability of trace metals and metalloids (Boulegue et al 1982;Matrai 1988;Lee and Hultberg 1990;Leal et al 1999;Harris et al 2003) in aquatic environments through complexation reactions (Cullen et al 1984;Hu et al 2006). …”

Section: Introductionmentioning

confidence: 99%

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Reduced Organic Sulfur: Analyisis and Interaction with Mercury in the Aquatic Environment

Chen¹

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Covalent affinity chromatography-based methods were attempted for analysis of ROS in environmental water samples. A method was developed for analysis of environmental thiols, by preconcentration using affinity covalent chromatographic column or solid phase extraction, followed by releasing of thiols from the thiopropyl sepharose gel using TCEP and analysis using HPLC-UV or HPLC-FL. Under the optimized conditions, the detection limits of the method using HPLC-FL detection were 0.45 and 0.36 nM for Cys and GSH, respectively. Our results suggest that covalent affinity methods are efficient for thiol enrichment and interference elimination, vii demonstrating their promising applications in developing a sensitive, reliable, and useful technique for thiol analysis in environmental water samples.The dissolution of mercury sulfide (HgS) in the presence of ROS and dissolved organic matter (DOM) was investigated, by quantifying the effects of ROS on HgS dissolution and determining the speciation of the mercury released from ROS-induced HgS dissolution. It was observed that the presence of small ROS (e.g., Cys and GSH) and large molecule DOM, in particular at high concentrations, could significantly enhance the dissolution of HgS. The dissolved Hg during HgS dissolution determined using the conventional 0.22 µm cutoff method could include colloidal Hg (e.g., HgS colloids) and truly dissolved Hg (e.g., Hg-ROS complexes). A centrifugal filtration method (with 3 kDa MWCO) was employed to characterize the speciation and reactivity of the Hg released during ROS-enhanced HgS dissolution. The presence of small ROS could produce a considerable fraction (about 40% of total mercury in the solution) of truly dissolved mercury (< 3 kDa), probably due to the formation of Hg-Cys or Hg-GSH complexes. The truly dissolved Hg formed during GSH-or Cys-enhanced HgS dissolution was directly reducible (100% for GSH and 40% for Cys) by stannous chloride, demonstrating its potential role in Hg transformation and bioaccumulation.

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Methylmercury in Some Swedish Surface Waters

Cited by 10 publications

References 0 publications

Mercury in Abiotic Matrices of Clear Lake, California: Human Health and Ecotoxicological Implications

Mercury in Abiotic Matrices of Clear Lake, California: Human Health and Ecotoxicological Implications

Global atmospheric changes.

Reduced Organic Sulfur: Analyisis and Interaction with Mercury in the Aquatic Environment

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