Mercury and suspended sediment, Carson River Basin, Nevada; loads to and from Lahontan Reservoir in flood year 1997 and deposition in reservoir prior to 1983

Hoffman, Ray J.; Taylor, R. Lynn

doi:10.3133/fs00198

Cited by 21 publications

(19 citation statements)

References 5 publications

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“…In terms of source, observed water column concentrations confirm earlier studies that found river DMeHg contributions sufficient to explain reservoir DMeHg concentrations (Gandhi et al 2007;Diamond et al 2000;Hoffman and Taylor 1998;Ecology and Environment 1998). In contrast, the possibility of larger dissolved THg fluxes occurs in the south basin (Kuwabara et al 2002), and these benthic sediments may be an important source to the reservoir.…”

Section: Discussionsupporting

confidence: 89%

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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Section: Discussionsupporting

confidence: 89%

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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“…A core taken from the south-central part of the lake shows concentrations of about 1,000 ng/g near the sediment surface with the greatest concentration, 81,000 ± 46,000 ng/g, at a depth of 90 cm. This large value is similar in magnitude to the values for lake cores from Lahontan Reservoir reported by Hoffman and Taylor (1998;4,000 to 15,000 ng/g) and also to values for bottom sediment (13,100 ng/g) at Stillwater Slough in the Carson Desert (Hoffman and Thomas, 2000). The smallest mercury concentration of 300 ng/g, was 100 cm at the bottom of the core, and immediately below the greatest concentration.…”

Section: Description Of Study Areasupporting

confidence: 86%

“…Many investigators have used sediment cores from lakes and reservoirs to determine atmospheric input of mercury on global scales (Fitzgerald and others, 1998;Swain and others, 1992). Other studies have used sediment cores to determine transport of mercury associated with mining activities to lakes and reservoirs (Hoffman and Taylor, 1998).…”

Section: Historical Deposition Of Mercury In Walker Lakementioning

confidence: 99%

Mercury in the Walker River Basin, Nevada and California: Sources, distribution, and potential effects on the ecosystem

Seiler¹,

Lico²,

Evers³

2004

Scientific Investigations Report

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“…A comparison between Hg contents detected in the sediments of the Castilseras reservoir and those reported for similar artificial basins located just downstream of Hg districts throughout the world is shown in Table 3. Only in the Lahontan reservoir (Hoffman and Taylor 1998;Hill et al 2008) Hg concentrations are higher than those found in Castilseras sediments. However, in both reservoirs, values are at least one order of magnitude higher than those observed in other case studies.…”

Section: Mercurymentioning

confidence: 57%

Heavy metal contamination in sediments of an artificial reservoir impacted by long-term mining activity in the Almadén mercury district (Spain)

García-Ordiales

Esbrí²,

Covelli

et al. 2015

Environ Sci Pollut Res

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Sediments from the Castilseras reservoir, located downstream on the Valdeazogues River in the Almadén mercury district, were collected to assess the potential contamination status related to metals(oids) associated with river sediment inputs from several decommissioned mines. Metals(oids) concentrations in the reservoir sediments were investigated using different physical and chemical techniques. The results were analyzed by principal component analysis (PCA) to explain the correlations between the sets of variables. The degree of contamination was evaluated using the enrichment factor (EF) and the geoaccumulation index (Igeo). PCA revealed that the silty fraction is the main metals(oids) carrier in the sediments. Among the potentially harmful elements, there is a group (Al, Cr, Cu, Fe, Mn, Ni, and Zn) that cannot be strictly correlated to the mining activity since their concentrations depend on the lithological and edaphological characteristics of the materials. In contrast, As, Co, Hg, Pb, and S showed significant enrichment and contamination, thus suggesting relevant contributions from the decommissioned mines through fluvial sediment inputs. As far as Hg and S are concerned, the high enrichment levels pose a question concerning the potential environmental risk of transfer of the organic forms of Hg (mainly methylmercury) from the bottom sediments to the aquatic food chain.

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Mercury and suspended sediment, Carson River Basin, Nevada; loads to and from Lahontan Reservoir in flood year 1997 and deposition in reservoir prior to 1983

Cited by 21 publications

References 5 publications

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

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

Mercury in the Walker River Basin, Nevada and California: Sources, distribution, and potential effects on the ecosystem

Heavy metal contamination in sediments of an artificial reservoir impacted by long-term mining activity in the Almadén mercury district (Spain)

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