Mercury on the move during snowmelt in Vermont

Shanley, James B.; Schuster, Paul F.; Reddy, Micaela B.; Roth, David A.; Taylor, Howard E.; Aiken, George R.

doi:10.1029/2002eo000031

Cited by 58 publications

(71 citation statements)

References 11 publications

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“…However, increases in Hg flux and changes in stream Hg chemistry during high flow events in forested watersheds have been reported elsewhere (Allan and Heyes, 1998;Scherbatskoy et al, 1998;Shanley et al, 2002;Mast et al, 2005). Hg flux was related to particulate organic matter during snowmelt in Vermont (Scherbatskoy et al, 1998;Shanley et al, 2002). The dissolved fraction of Hg, particularly in relation to DOC, also contributes to Hg mobilization during elevated discharge events, including snowmelt 4814 J. T. BUSHEY ET AL.…”

Section: Introductionmentioning

confidence: 64%

“…Babiarz et al (1998) reported no change in Hg concentrations with discharge during monthly sampling of forested ecosystems in Wisconsin, suggesting that Hg flux was largely a function of discharge. However, increases in Hg flux and changes in stream Hg chemistry during high flow events in forested watersheds have been reported elsewhere (Allan and Heyes, 1998;Scherbatskoy et al, 1998;Shanley et al, 2002;Mast et al, 2005). Hg flux was related to particulate organic matter during snowmelt in Vermont (Scherbatskoy et al, 1998;Shanley et al, 2002).…”

Section: Introductionmentioning

confidence: 64%

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Mercury transport in response to storm events from a northern forest landscape

Bushey

Driscoll

Mitchell

et al. 2008

Hydrological Processes

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Abstract:Concentrations and fluxes of mercury (Hg) species in surface waters of forested watersheds are affected by hydrological events. The mechanisms of Hg transport during these events are poorly understood and yet may influence Hg bioavailability and exposure to aquatic biota. Three storm events with varying magnitude and intensity were investigated (June, September and November 2005) at a forested watershed in the Adirondack region of New York State, USA. Concentrations of Hg species increased during these events, both above and downstream of wetlands in the watershed. While Hg flux was higher from wetland drainage, the Hg flux from the upland site exhibited a greater relative increase to elevated runoff. Hg flux was controlled by discharge; however, Hg species concentrations were not well correlated with discharge, dissolved organic carbon (DOC), or total suspended solids (TSS) through the duration of events. A counter-clockwise hysteresis response of DOC with increasing runoff contrasted with the clockwise response for total Hg, suggesting different contributions from source areas for these solutes. Correspondence with elevated total K and NO 3 (˛< 0Ð05) during the rising limb of the hydrograph suggests rapid delivery of throughfall Hg, potentially enhanced by hillslope hollows, to the stream channel. As the watershed saturated, stream Hg appears to be derived from the soil Hg pool. Results suggest that particulate Hg did not contribute substantially to total Hg flux during events (<25%). These results emphasize the role of watershed attributes and storm characteristics in Hg transport and bioavailability.

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Section: Introductionmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 64%

Mercury transport in response to storm events from a northern forest landscape

Bushey

Driscoll

Mitchell

et al. 2008

Hydrological Processes

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“…The long-term data and biogeochemical understanding from nearly two decades of intensive research at these sites provide rich context for the interpretation of Hg behavior. This recent focus on Hg in the WEBB program builds on previous work at three of the sites: Vermont (Shanley et al, 2002;Schuster et al, 2008); Colorado (Mast et al, 2005); and Wisconsin (Krabbenhoft et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach

Shanley

Mast

Campbell

et al. 2008

Environmental Pollution

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101

108

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Martin M., "Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach" (2008 High-flow sampling reveals strong contrasts in total mercury and methylmercury cycling in five diverse USA watersheds. AbstractThe small watershed approach is well-suited but underutilized in mercury research. We applied the small watershed approach to investigate total mercury (THg) and methylmercury (MeHg) dynamics in streamwater at the five diverse forested headwater catchments of the US Geological Survey Water, Energy, and Biogeochemical Budgets (WEBB) program. At all sites, baseflow THg was generally less than 1 ng L À1 and MeHg was less than 0.2 ng L À1. THg and MeHg concentrations increased with streamflow, so export was primarily episodic. At three sites, THg and MeHg concentration and export were dominated by the particulate fraction in association with POC at high flows, with maximum THg (MeHg) concentrations of 94 (2.56) ng L À1 at Sleepers River, Vermont; 112 (0.75) ng L À1 at Rio Icacos, Puerto Rico; and 55 (0.80) ng L À1at Panola Mt., Georgia. Filtered (<0.7 mm) THg increased more modestly with flow in association with the hydrophobic acid fraction (HPOA) of DOC, with maximum filtered THg concentrations near 5 ng L À1 at both Sleepers and Icacos. At Andrews Creek, Colorado, THg export was also episodic but was dominated by filtered THg, as POC concentrations were low. MeHg typically tracked THg so that each site had a fairly constant MeHg/THg ratio, which ranged from near zero at Andrews to 15% at the low-relief, groundwater-dominated Allequash Creek, Wisconsin. Allequash was the only site with filtered MeHg consistently above detection, and the filtered fraction dominated both THg and MeHg. Relative to inputs in wet deposition, watershed retention of THg (minus any subsequent volatilization) was 96.6% at Allequash, 60% at Sleepers, and 83% at Andrews. Icacos had a net export of THg, possibly due to historic gold mining or frequent disturbance from landslides. Quantification and interpretation of Hg dynamics was facilitated by the small watershed approach with emphasis on event sampling.

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“…AJES previous studies showed a strong interactions between Hg and DOM have also been indicated by a positive correlation between their concentrations in many natural waters (Andren and Harriss, 1975;Lindberg and Harriss, 1974;Mierle and Ingram, 1991;Meili et al, 1991;Driscoll et al, 1995;Hurley et al, 1995;Watras et al, 1995;Baeyens et al, 1996;Kolka et al, 1999;Shanley et al, 2002).…”

Section: Science Publicationsmentioning

confidence: 99%

The Correlations Between Mercury Speciation and Dissolved Organic Matter in the Sediment of the Red Sea

Wedyan

Ababneh

Al-Rousan

2012

American Journal of Environmental Sciences

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This study addresses the correlations between Hg and organic matter in recent sediment; samples were collected from the Gulf of Aqaba, Red Sea coasts (oligotrophic regions) during 2010. In the present study TOC analyzer was used to determine Total Organic Carbon (TOC) and Total Nitrogen (TN) concentrations and the total amount of mercury (Hg T ) in sediment samples were analyzed by Hydra-C mercury analyzer. The obtained results indicated that, mercury, TOC and TN average concentrations in the Red Sea were 85.42 ng g −1 , 5.10 and 4.45 mg L −1 , respectively. The results show that the Total Organic Carbon (TOC) in sediment represents the sum of various organic compounds, which may play a completely different role in the distribution and accumulation of Hg. slightly correlations between the TOC and the concentration of Hg in the studied sediment arise mainly from the labile portion of organic matter released. These compounds primarily consist of easily degradable algal-derived lipids and various pigments, which are petrographically described as a soluble Organic Matter (OM). The preserved OM in sediment is commonly entrapped within the cell walls of phytoplankton and also appears as a surface coating on sediment particles. The strong affinity between Hg and OM is due not only to its chemical reactivity, but also to the physical characteristic of these labile compounds, which plays the most important role in the distribution of Hg in sediment.

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Mercury on the move during snowmelt in Vermont

Cited by 58 publications

References 11 publications

Mercury transport in response to storm events from a northern forest landscape

Mercury transport in response to storm events from a northern forest landscape

Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach

The Correlations Between Mercury Speciation and Dissolved Organic Matter in the Sediment of the Red Sea

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