Tributary loading of mercury to Lake Michigan: Importance of seasonal events and phase partitioning

Hurley, James P.; Cowell, Susan E.; Shafer, Martin M.; Hughes, Peter

doi:10.1016/s0048-9697(98)00084-9

Cited by 71 publications

(68 citation statements)

References 27 publications

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“…Episodic transport of THg driven by large concurrent increases in THg concentrations and streamflow has been well documented (Hurley et al, 1998a;Babiarz et al, 1998;Balogh et al, 2005;Scherbatskoy et al, 1998). Episodic transport of MeHg has been less commonly observed but does occur (Branfireun et al, 1996;Babiarz et al, 1998).…”

Section: Episodic Transportmentioning

confidence: 99%

“…Application of the small watershed approach to investigations of Hg cycling remains limited , but there are several examples in the literature (Krabbenhoft et al, 1995;Bishop et al, 1995a,b;Lee et al, 1998;Scherbatskoy et al, 1998;Allan and Heyes, 1998;Kolka et al, 1999;Allan et al, 2001;Schwesig and Matzner, 2001;Mast et al, 2005;Nelson et al, 2007;Harris et al, 2007). Event sampling, one of the key elements in small watershed research, is not always part of the design of these watershed studies, and has more often been applied to mesoscale or larger rivers (Hurley et al, , 1998aBabiarz et al, 1998;Balogh et al, 1997Balogh et al, , 1998Balogh et al, , 2005. Event sampling of flashy headwater streams is a challenging endeavor because of the unpredictability of high flows, remoteness of the sites, and the need for human presence (automated sampling of Hg is difficult and rare).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the high THg fluxes from these uplands suggest that they are an important source of THg for methylation in lowland streams, wetlands, and lakes (Allan et al, 2001;Munthe et al, 2007). Even if exported in the particulate fraction, THg is available for methylation in downstream receiving waters if desorbed or upon decomposition of the binding organic matter (Hurley et al, 1998a), though questions remain about the bioavailability of this particulate THg (Munthe et al, 2007).…”

mentioning

confidence: 99%

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

Shanley

Mast

Campbell

et al. 2008

Environmental Pollution

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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Section: Episodic Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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

Shanley

Mast

Campbell

et al. 2008

Environmental Pollution

101

108

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“…Septic-system effluent discharges, which were ubiquitous in the unsewered residential areas with Hg-contaminated well water, apparently drove redox reactions that influenced THg mobility in the aquifer. Discharges with elevated concentrations of electron donors promoted reductive dissolution of Fe hydroxide coatings on subsoil and aquifer sediment grains and sorbed Hg (presumably as Hg(II)), was released to groundwater (Barringer & (2012) in New Jersey, the composition of the particulates is not known at the various residential Hg contamination sites-they could be Fe hydroxides (Ryan & Gschwend, 1990), clay minerals (Ryan & Gschwend, 1994), organic material (Hurley et al, 1998), mixed organo-oxide colloids (Chadwick et al, 2006), or sulfide particles , depending on the geochemical environment in which they form.…”

Section: New Jersey Coastal Plain Usamentioning

confidence: 99%

Occurrence and Mobility of Mercury in Groundwater

Barringer¹,

Szabó²,

Reilly³

2013

Current Perspectives in Contaminant Hydrology and Water Resources Sustainability

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“…The Wisconsin Department of Natural Resources (2001) considers Hg in the environment to be primarily of human origin. Although studies of Hg loading to rivers draining the upper Mississippi River drainage basin and other USA rivers show that the primary sources of Hg are from eroded soil and terrestrial plant materials, the unexamined assumption is that Hg associated with these materials is substantially anthropogenic (Balogh et al, 1998;2003;Hurley et al, 1998). Mercury associated with sediments carried by the Mississippi River are reported to be primarily responsible for Hg fisheries advisories in the lower Mississippi River.…”

Section: Introductionmentioning

confidence: 99%