Concentration of Mercury, Methylmercury, Cadmium, Lead, Arsenic, and Selenium in the Rain and Stream Water of Two Contrasting Watersheds in Western Maryland

Lawson, Nicole; Mason, Robert P.

doi:10.1016/s0043-1354(01)00140-3

Cited by 75 publications

(56 citation statements)

References 28 publications

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“…1), was not significantly higher than at the Molino site which is furthest away from local mercury emission sources (24 km from Crist power plant and 14 km from International Paper). Our results contrast with studies in Michigan and Maryland which found higher mercury deposition in urban areas compared to rural areas (Mason et al, 2000;Lawson and Mason, 2001;Landis et al, 2002;Keeler and Dvonch, 2005) and those finding higher concentrations of mercury in rainwater close to coalfired utilities (White et al, 2009). We did observe seasonal differences, with the highest deposition rate during the summer at Pensacola Bay and MDN sites.…”

Section: Discussioncontrasting

confidence: 99%

Atmospheric deposition of mercury and major ions to the Pensacola (Florida) watershed: spatial, seasonal, and inter-annual variability

Caffrey

Landing

Nolek³

et al. 2010

Atmos. Chem. Phys.

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Abstract. Atmospheric deposition was measured at three sites in the Pensacola Bay watershed, Florida, between November 2004 and December 2007. Mercury deposition in the Pensacola Bay watershed was similar to that from nearby Mercury Deposition Network sites along the Northern Gulf of Mexico coast. Mercury deposition during the summer months is higher than other months due to higher concentrations in rainfall throughout the region. Deposition of constituents like H + , sulfate, nitrate, ammonium, chloride and sodium, were much higher in Pensacola Bay that at National Atmospheric Deposition Program (NADP) sites. Chloride and sodium deposition are higher because Pensacola Bay sites are closer to the Gulf of Mexico which is a source of sea salt aerosols. Acid rain constituents, H + , sulfate, nitrate and ammonium are most likely higher at Pensacola Bay sites because these sites are much closer to emission sources of these constituents than NADP sites, particularly two Florida NADP sites, FL14 and FL23, which are located in rural counties far from major industrial activities.

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Section: Discussioncontrasting

confidence: 99%

Atmospheric deposition of mercury and major ions to the Pensacola (Florida) watershed: spatial, seasonal, and inter-annual variability

Caffrey

Landing

Nolek³

et al. 2010

Atmos. Chem. Phys.

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“…For example, inputs of mercury (Hg) to a waterbody can be influenced by atmospheric deposition (2), geology (3), soil and vegetation type (4), and large precipitation events (5). Increases in water temperature, dissolved organic carbon (DOC), and sulfate (SO 4 2Ϫ ) and declines in pH can increase in-lake Hg methylation (6).…”

mentioning

confidence: 99%

Forest fire increases mercury accumulation by fishes via food web restructuring and increased mercury inputs

Kelly

Schindler

Louis

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

127

121

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Recent findings indicate that fishes from lakes in partially burned catchments contain greater mercury (Hg) concentrations than fishes from reference catchments. Increased methyl Hg (MeHg) concentrations in fishes can result in serious health problems for consumers. Here we show that a forest fire caused a 5-fold increase in whole-body Hg accumulation by rainbow trout (Oncorhynchus mykiss) and smaller Hg increases in muscle of several fish species in a mountain lake. The enhanced Hg accumulation was caused primarily by increased nutrient concentrations in the lake, which enhanced productivity and restructured the food web through increased piscivory and consumption of Mysis. This restructuring resulted in increases to the trophic positions and Hg concentrations of fishes. Forest fire also caused a large short-term release of total Hg (THg) and MeHg to streams and the lake. This release initiated a small pulse of MeHg in invertebrates that contributed to enhanced Hg accumulation by fishes. Climate change and prescribed burning to compensate for past fire suppression are predicted to increase future forest fire occurrence in North America, and increased Hg accumulation by fishes may be an unexpected consequence.productivity ͉ stable isotopes ͉ methyl mercury ͉ food chain length ͉ climate change

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“…All data are available in Appendix D and Table 5 summarizes the mean, median, and volume-weight concentrations for THg and MMHg. While the mechanism for the presence of MMHg in rainfall is not understood, numerous observations have been made which suggest that it is typically present at levels less than 1.5% of the total mercury in rainfall Ebinghaus et al, 1999;Lawson and Mason, 2001;. Exceptions to this generalization on MMHg levels in rainfall include higher values reported for the Great Lakes area (up to 18%) and in Sweden (3%) .…”

Section: Mercury and Methylmercurymentioning

confidence: 99%

“…While the mechanism for the presence of MMHg in rainfall is debated in the literature, numerous observations have been made that suggest it is typically present at levels of less than 1.5% of the THg in rainfall Ebinghaus et al 1999;Lawson and Mason 2001;. A current hypothesis for the source of MMHg in precipitation is the abiotic methylation of Hg by carboxylic acids, particularly acetate (Gardfeldt et al 2003;Hammerschmidt et al 2007;Conaway et al 2010).…”

mentioning

confidence: 99%

Control of Toxic Chemicals in Puget Sound, Phase 3: Study of Atmospheric Deposition of Air Toxics to the Surface of Puget Sound

Brandenberger¹,

Louchouarn²,

Kuo³

et al. 2010

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Concentration of Mercury, Methylmercury, Cadmium, Lead, Arsenic, and Selenium in the Rain and Stream Water of Two Contrasting Watersheds in Western Maryland

Cited by 75 publications

References 28 publications

Atmospheric deposition of mercury and major ions to the Pensacola (Florida) watershed: spatial, seasonal, and inter-annual variability

Atmospheric deposition of mercury and major ions to the Pensacola (Florida) watershed: spatial, seasonal, and inter-annual variability

Forest fire increases mercury accumulation by fishes via food web restructuring and increased mercury inputs

Control of Toxic Chemicals in Puget Sound, Phase 3: Study of Atmospheric Deposition of Air Toxics to the Surface of Puget Sound

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