Sediment Profile and Fluxes of Mercury and Methyl Mercury in Weihe Watershed in Henan, China

Li, Qingzhao; Jiang, Lingyan; Wang, Dingyong; Luo, Xu

doi:10.1007/s00128-015-1549-x

Cited by 4 publications

(3 citation statements)

References 14 publications

(14 reference statements)

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“…Hg atmospheric dry deposition, wet deposition, and evasion from the sea surface from the literature are applied. ,, The amount of Hg in the sea margin sediments is estimated from the sea margin area, the density of the sediment, the interaction depth and the concentration of Hg. The Hg in the seawater can deposit within the surface sediment, and the Hg in surface sediment can release into the water volume, which can create instability in the vertical Hg concentrations in the surface sediment . The depth of the unstable layer is called the “interaction depth”.…”

Section: Methodsmentioning

confidence: 99%

“…The Hg in the seawater can deposit within the surface sediment, 62 and the Hg in surface sediment can release into the water volume, 63 which can create instability in the vertical Hg concentrations in the surface sediment. 64 The depth of the unstable layer is called the "interaction depth". The interaction depth is set by the depth at which Hg from the sediment could directly affect the seawater, which ranges from 20 to 100 cm; 62,65−67 an average of 50 cm is chosen here.…”

Section: ■ Introductionmentioning

confidence: 99%

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Mercury Export from Mainland China to Adjacent Seas and Its Influence on the Marine Mercury Balance

Liu

Chen

Wang

et al. 2016

Environ. Sci. Technol.

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Exports from mainland China are a significant source of mercury (Hg) in the adjacent seas (Bohai Sea, Yellow Sea, East China Sea, and South China Sea) near China. A total of 240 ± 23 Mg was contributed in 2012 (30% from natural sources and 70% from anthropogenic sources), including Hg from rivers, industrial wastewater, domestic sewage, groundwater, nonpoint sources, and coastal erosion. Among the various sources, the Hg from rivers amounts to 160 ± 21 Mg and plays a dominant role. The Hg that is exported from mainland China increased from 1984 to 2013; the contributions from rivers, industrial wastewater, domestic sewage and groundwater increased, and the contributions from nonpoint sources and coastal erosion remained stable. A box model is constructed to simulate the mass balance of Hg in these seas and quantify the sources, sinks and Hg biogeochemical cycle in the seas. In total, 160 Mg of Hg was transported to the Pacific Ocean and other oceans from these seas through oceanic currents in 2012, which could have negative impacts on the marine ecosystem. A prediction of the changes in Hg exportation through 2030 shows that the impacts of terrestrial export might worsen without effective pollution reduction measures and that the Hg load in these seas will increase, especially in the seawater of the Bohai Sea, Yellow Sea, and East China Sea and in the sea margin sediments of the Bohai Sea and East China Sea.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Mercury Export from Mainland China to Adjacent Seas and Its Influence on the Marine Mercury Balance

Liu

Chen

Wang

et al. 2016

Environ. Sci. Technol.

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“…Macrofauna also influence the cycling of mercury (Hg) species at the sediment-water interface, including the sediment efflux of methylmercury (MeHg; Benoit et al 2009), a concern because MeHg is the toxic, organic form of Hg that readily bioaccumulates in aquatic ecosystems (Selin 2009). Macrofaunamediated efflux of MeHg has been implicated in a number of marine and freshwater studies (Choe et al 2005, Point et al 2007, Hammerschmidt and Fitzgerald 2008, Li et al 2015) that consistently show fluxes of MeHg based on buildup rates in overlaying water exceed rates calculated using diffusive concentration gradients, with the difference being attributed to enhanced MeHg efflux due to macrofauna activity. Macrofauna density can have potentially contradictory effects on MeHg efflux from sediments (Benoit et al 2009).…”

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confidence: 99%

Effects of chironomid density and dissolved oxygen on mercury efflux from profundal lake sediment

Beutel

Cox

Gebremariam

2016

Lake and Reservoir Management

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Benthic macrofauna can dramatically affect the flux of dissolved compounds into and out of lake sediment. In this study, replicate experimental chambers containing profundal sediment from a relatively pristine lake were incubated under low (∼1000/m 2) and high (∼3800/m 2) chironomid densities and low (∼2.5 mg/L) and medium (∼5.0 mg/L) dissolved oxygen in chamber water. Dissolved methylmercury efflux rates were highest in high chironomid density/low oxygen chambers (0.35 ± 0.06 ng/m 2 /d, mean ± standard error, n = 4) and lowest in low density/medium oxygen chambers (0.06 ± 0.14 ng/m 2 /d). In contrast, dissolved total mercury efflux assessed at low dissolved oxygen (∼2.5 mg/L) was higher at low chironomid density (4.6 ± 0.7 ng/m 2 /d) relative to high chironomid density (2.5 ± 0.8 ng/m 2 /d, n = 4). Results indicate that oxygen addition, a common lake management practice, may enhance methylmercury efflux from profundal sediment as macrofauna recolonize previously anaerobic sediments. However, benthosmediated methylmercury efflux rates are lower than hypolimnetic methylmercury accumulation rates under anaerobic conditions; therefore, relative to anaerobic conditions, oxygenation should lower net methylmercury accumulation rates in relatively pristine lakes.

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Mercury and methylmercury distribution in the intertidal surface sediment of a heavily anthrophogenically impacted saltwater-mangrove-sediment interplay zone

2017

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Total mercury (THg) and methylmercury (MeHg) concentrations were determined from sediment samples collected from thirty sampling stations in Port Klang, Malaysia. Three stations had THg concentrations exceeding the threshold effect level of the Florida Department of Environmental Protection and the Canadian interim sediment quality guidelines. THg and MeHg concentrations were found to be concentrated in the Lumut Strait where inputs from the two most urbanized rivers in the state converged (i.e. Klang River and Langat River). This suggests that Hg in the study area likely originated from the catchments of these rivers. MeHg made up 0.06-94.96% of the sediment's THg. There is significant positive correlation (p < 0.01) between THg and MeHg concentrations. Significant positive correlation (p < 0.05) was also observed between fine sediment particles (i.e. clay and silt) with MeHg concentrations. Sediment particle size, however, was not found to have any influence on THg concentrations in the sediment in the study area.

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Sediment Profile and Fluxes of Mercury and Methyl Mercury in Weihe Watershed in Henan, China

Cited by 4 publications

References 14 publications

Mercury Export from Mainland China to Adjacent Seas and Its Influence on the Marine Mercury Balance

Mercury Export from Mainland China to Adjacent Seas and Its Influence on the Marine Mercury Balance

Effects of chironomid density and dissolved oxygen on mercury efflux from profundal lake sediment

Mercury and methylmercury distribution in the intertidal surface sediment of a heavily anthrophogenically impacted saltwater-mangrove-sediment interplay zone

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