Hydrologic controls on water chemistry and mercury biotransformation in a closed river system: The Carson River, Nevada

Nemer, Bassel; Lyons, W. Berry

doi:10.1016/j.apgeochem.2006.08.010

Cited by 18 publications

(7 citation statements)

References 34 publications

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“…The ranges of methylation and demethylation rates used in this study were limited to rates reported in Stamenkovic et al (2004) for different reaches of SBC, and therefore the calibrated rates (Tables 4 and 5) fall within these ranges. Measured methylation/ demethylation (M/D) ratios in SBC ranged from 0.02 to 6.46 (Stamenkovic et al, 2004), and reported M/D ratios in the Carson River systems have ranged from 0.2 to 10 (Bonzongo, Nemer, & Lyons, 2006). The calibrated values of 0.02-0.20 for the current study fall well within the ranges presented by Gilmour and Henry (1991) of <0.03-6.…”

Section: Figures 3 and 4 Show The Calibrated Model Resultssupporting

confidence: 61%

Calibration and Evaluation of a Mercury Model for a Western Stream and Constructed Wetland

Brown

Saito

Knightes

et al. 2007

Water Air Soil Pollut

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Numerous studies have shown that Steamboat Creek in Nevada is highly contaminated with mercury, with aqueous mercury concentrations more than two orders of magnitude greater than nearby mountain streams. One objective of this study was to determine if the new Spreadsheet-based Ecological Risk Assessment for the Fate of Mercury (SERAFM) model could be calibrated to the concentrations of unfiltered and dissolved total mercury, and unfiltered and dissolved MeHg in the water column for a reach on SBC and a related constructed wetland mesocosm for different seasons and residence times. SERAFM is a new U.S. Environmental Protection Agency steady state, single segment, mass balance mercury model that has been applied to lakes, and this study also examined the model's applicability for modeling an arid flowing water environment in different seasons. The average combined error between observed and model-estimated mercury concentrations was 12% and 17% for the reach and mesocosm, respectively. Some recommendations are proposed that may allow SERAFM to better model flowing systems.

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Section: Figures 3 and 4 Show The Calibrated Model Resultssupporting

confidence: 61%

Calibration and Evaluation of a Mercury Model for a Western Stream and Constructed Wetland

Brown

Saito

Knightes

et al. 2007

Water Air Soil Pollut

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“…The percent recovery on the IAEA-405 averaged 95±11% (n=10) and 93±8% (n=10) for THg and MeHg, respectively. Details regarding analytical procedures have been described elsewhere (e.g., Warner et al 2003Warner et al , 2005Bonzongo et al 2006;Donkor et al 2005Donkor et al , 2006Byrne et al 2009;Cohen et al 2009). …”

Section: Mercury Analysismentioning

confidence: 99%

Seasonal Variation of Mercury Associated with Different Phytoplankton Size Fractions in Lahontan Reservoir, Nevada

Carroll

Memmott

Warwick

et al. 2010

Water Air Soil Pollut

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Sampling is conducted during 2006 in Lahontan Reservoir, Nevada to investigate seasonal variation of total mercury (THg) and methylmercury (MeHg) partitioning in different phytoplankton size fractions as a function of point source (fluvial) mercury (Hg) loads, reservoir residence time, and algal growth. Carson River Hg inputs into the reservoir are extremely dynamic with spring loads two orders of magnitude larger than summer loads. Chlorophyll a measurements show two periods of algal growth. A small amount of algal growth occurs March to May. A second more substantial bloom occurs in the late summer, which is dominated by large, filamentous algae. THg concentrations (C b ) and partitioning coefficients (K d ) in total suspended particulate matter (SPM) are highest when fluvial inputs of Hg-contaminated sediment are large and are not necessarily associated with living biomass. However, MeHg K d in the small size fraction is indirectly related to fluvial loads and more strongly associated with living biomass in the later portion of the summer when algal growth occurs and reservoir residence times are longer. Data suggest size distinction is important to MeHg partitioning in the reservoir. Lumping all sizes into a single SPM sample will bias the analysis toward low MeHg C b and low MeHg K d in late summer when Aphanizomenon flos-aquae dominates the phytoplankton assemblage.

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“…Mercury contamination exists in some western Nevada soils due to gold milling and smelting of ores dating back to the nineteenth century mining of the Comstock Lode near Virginia City. Contamination of soils by methyl mercury along the Carson River and tributaries to the Truckee River has impacts on stream restoration, constructed wetland projects, and health of fisheries in Lahontan Reservoir and Pyramid Lake (Gustin et al 1994;Bonzongo et al 2006). Scientists have also requested soil geochemical data related to W for investigating a childhood leukemia cluster in Fallon, Nevada.…”

Section: Geochemical Applications Within Soil Surveymentioning

confidence: 99%

Geochemistry in the modern soil survey program

Wilson¹,

Burt²,

Indorante³

et al. 2007

Environ Monit Assess

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Hydrologic controls on water chemistry and mercury biotransformation in a closed river system: The Carson River, Nevada

Cited by 18 publications

References 34 publications

Calibration and Evaluation of a Mercury Model for a Western Stream and Constructed Wetland

Calibration and Evaluation of a Mercury Model for a Western Stream and Constructed Wetland

Seasonal Variation of Mercury Associated with Different Phytoplankton Size Fractions in Lahontan Reservoir, Nevada

Geochemistry in the modern soil survey program

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