Wetlands as principal zones of methylmercury production in southern Louisiana and the Gulf of Mexico region

Hall, Britt D.; Aiken, George R.; Krabbenhoft, David P.; Marvin-DiPasquale, Mark C.; Swarzenski, Christopher M.

doi:10.1016/j.envpol.2007.12.017

Cited by 177 publications

(125 citation statements)

References 58 publications

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“…Unlike in other mining areas, rice cultivation is a common practice by farmers in mining areas in Guizhou. Rice paddies are a type of wetland system and are commonly considered to be a source of methylation [130][131][132]. Zhang et al [110] and Meng et al [133] found high MeHg concentrations in rice grains in Hg mining areas.…”

Section: Mercury In Heavily Contaminated Sitesmentioning

confidence: 99%

Environmental mercury in China: A review

Lin

Vogt

Larssen

2012

Enviro Toxic and Chemistry

101

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Abstract-Mercury is a global pollutant that can be transported over long distances and can bioaccumulate. Currently, China is the country that contributes most to atmospheric Hg emissions and has the greatest intentional (industrial) use of Hg. Mercury in the Chinese environment is generally elevated, particularly in air and water bodies. Remote areas in China also show elevated Hg levels in air and water bodies compared to other rural regions in the world. Large river estuaries are often heavily affected by upstream industrial sources.

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Section: Mercury In Heavily Contaminated Sitesmentioning

confidence: 99%

Environmental mercury in China: A review

Lin

Vogt

Larssen

2012

Enviro Toxic and Chemistry

101

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“…This study is one of several, however, in which variation in SUVA 254 values account for much of the variation in FTHg concentrations in surface waters (Table 2). Instances where the FTHg-SUVA 254 association is about as strong, or stronger than the FTHg-DOC association tend to be from synoptic-type studies in which surface waters with diverse land cover have been sampled (Hall et al 2008;Tsui and Finlay 2011;Burns et al 2012), with the exception of the current study. In contrast, the FTHg-SUVA 254 relation tends to be relatively weaker than that of FTHg-DOC or FTHg-UV 254 in watersheds with more uniform, largely forested upland land cover (Schuster et al 2008;Dittman et al 2010).…”

Section: Seasonal Variation In Hg and Organic Carbon Measuresmentioning

confidence: 99%

Specific ultra-violet absorbance as an indicator of mercury sources in an Adirondack River basin

et al. 2012

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“…Because tidal exchange in estuarine and coastal marshes drives a significant flux of wetland-derived material into surrounding surface waters (Eckard et al 2007;Hall et al 2008;Kraus et al 2008), production of MeHg in tidal marsh systems could be an important source of MeHg to pelagic estuarine food webs. Tidal export from wetlands links the zone of MeHg production to open-water areas (Hall et al 2008;Mitchell and Gilmour 2008). Once in open waters, MeHg can become preferentially associated with phytoplankton (Gorski et al 2008) and thereby enter the base of the pelagic piscivorous food web (Mason et al 2006).…”

mentioning

confidence: 99%

“…Tidal wetland MeHg production has been associated with high organic matter production (Hall et al 2008), vegetation uptake and decomposition (Windham-Myers et al 2009), metal cycling (Mitchell and Gilmour 2008), and wetland sediment MeHg production (Heim et al 2007). Because tidal exchange in estuarine and coastal marshes drives a significant flux of wetland-derived material into surrounding surface waters (Eckard et al 2007;Hall et al 2008;Kraus et al 2008), production of MeHg in tidal marsh systems could be an important source of MeHg to pelagic estuarine food webs. Tidal export from wetlands links the zone of MeHg production to open-water areas (Hall et al 2008;Mitchell and Gilmour 2008).…”

mentioning

confidence: 99%

Methyl mercury dynamics in a tidal wetland quantified using in situ optical measurements

Bergamaschi

Fleck

Downing

et al. 2011

Limnology & Oceanography

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We assessed monomethylmercury (MeHg) dynamics in a tidal wetland over three seasons using a novel method that employs a combination of in situ optical measurements as concentration proxies. MeHg concentrations measured over a single spring tide were extended to a concentration time series using in situ optical measurements. Tidal fluxes were calculated using modeled concentrations and bi-directional velocities obtained acoustically. The magnitude of the flux was the result of complex interactions of tides, geomorphic features, particle sorption, and random episodic events such as wind storms and precipitation. Correlation of dissolved organic matter quality measurements with timing of MeHg release suggests that MeHg is produced in areas of fluctuating redox and not limited by buildup of sulfide. The wetland was a net source of MeHg to the estuary in all seasons, with particulate flux being much higher than dissolved flux, even though dissolved concentrations were commonly higher. Estimated total MeHg yields out of the wetland were approximately 2.5 mg m 22 yr 21 -4-40 times previously published yields-representing a potential loading to the estuary of 80 g yr 21 , equivalent to 3% of the river loading. Thus, export from tidal wetlands should be included in mass balance estimates for MeHg loading to estuaries. Also, adequate estimation of loads and the interactions between physical and biogeochemical processes in tidal wetlands might not be possible without long-term, high-frequency in situ measurements.

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Wetlands as principal zones of methylmercury production in southern Louisiana and the Gulf of Mexico region

Cited by 177 publications

References 58 publications

Environmental mercury in China: A review

Environmental mercury in China: A review

Specific ultra-violet absorbance as an indicator of mercury sources in an Adirondack River basin

Methyl mercury dynamics in a tidal wetland quantified using in situ optical measurements

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