Mercury empirical relationships in sediments from three Ontario lakes

Ethier, A.L.M.; Scheuhammer, Anton M.; Blais, Jules M.; Paterson, Andrew M.; Mierle, Greg; Ingram, R. Grant; Lean, D. R. S.

doi:10.1016/j.scitotenv.2009.12.037

Cited by 22 publications

(24 citation statements)

References 35 publications

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“…8 Sosso-Kolle, 2008, MSc thesis)) for these lakes. Model output for sediment solid THg for these two lakes was comparable to the littoral and deeper (20-25 cm) pelagic sediments, and roughly three times less than the surface (0-10 cm) sediments in the pelagic region (Harp ¼ 335.7 ng g À1 ; Dickie ¼ 291.2 ng g À1 ) [13]. These results are comparable to the pattern observed with the HERMES model output for Big Dam West, Kejimkujik Park (NS, Canada) [2].…”

Section: Model Application and Verificationmentioning

confidence: 81%

“…Krabbenhoft et al [29] [13]. Oligotrophic Harp Lake has a sediment MeHg:THg ratio that is much lower than the average reported by Kamman et al [17], but water column and inflow MeHg:THg ratios comparable to ranges reported by Krabbenhoft et al [29].…”

Section: Sediment Mehg:thg Ratiomentioning

confidence: 85%

“…For example, a larger watershed with high lake dissolved organic carbon concentration (often related to wetland area, where Hg methylation is generally very rapid) and/or low pH (reduces sulfide activity-increasing bioavailable Hg fraction, Hg 2þ activity, and possibilities for Hg 2þ or CH 3 -Hg þ to enter fish) will promote methylation within the sediments [26,28]. Correlations between MeHg, THg, and/or MeHg:THg ratios in environmental media (except biota) and watershed variables were found for inflow water, water column, and sediment in lakes through experimental research [13] and literature (e.g., [18,29,30]). …”

Section: Food Web Applicationsmentioning

confidence: 91%

“…On the contrary, Regnell and Ewald [35] found that sediment MeHg levels decreased during summer stratification in the pelagic region until August before eventually increasing again. Ethier et al [13] found a significant correlation between surface sediment MeHg:THg ratio and redox potential or total organic carbon, but not with respect to thermocline formation. The redox potential (mV) and total organic carbon (TOC, %) were significantly correlated with surface sediment MeHg:THg, but not with each other, and could explain more variation in MeHg:THg ratio when considered together (r 2 ¼ 0.27; p < 0.05; n ¼ 26 data from three lakes).…”

Section: Sediment Mehg:thg Ratiomentioning

confidence: 97%

“…These defaults for MeHg:THg (used to derive the model MeHg:Hg 0 ratio) are sufficient to properly model THg in the environment. Estimated (or measured) MeHg:THg ratios for sediment, water, water inflow, or even air should only be considered (rather than using default values) if model output is intended for food web applications, since MeHg generally constitutes <5% THg in lakes [13].…”

Section: Sediment Mehg:thg Ratiomentioning

confidence: 99%

See 4 more Smart Citations

Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

Ethier

Lean

Scheuhammer

et al. 2010

Enviro Toxic and Chemistry

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The purpose of the present study was to evaluate the mercury (Hg) Environmental Ratios Multimedia Ecosystem Sources (HERMES) model on two Ontario, Canada lakes (Harp and Dickie) and to include modifications to enable the model to estimate the major model input variables that tend to be missing for lakes with limited datasets. No significant differences were found for either sediment solid or bulk water total mercury (THg) when the HERMES model was applied to the two Ontario lakes, regardless of whether all available data were altered during application or only the 10 variables that tend to cause the most variation in model output (i.e., concentration of THg in atmosphere, water inflow THg concentration, water inflow rate, water volume, surface area, mean depth, suspended particulate matter concentration, settling rate of solids in water column, water temperature, and precipitation rate). Since measured sediment and water THg values do not exist for most lakes removed from industrial activities, empirical relationships were incorporated into the HERMES model framework to provide a method to double-check model output for lakes where this information is unavailable.

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Section: Model Application and Verificationmentioning

confidence: 81%

Section: Sediment Mehg:thg Ratiomentioning

confidence: 85%

Section: Food Web Applicationsmentioning

confidence: 91%

Section: Sediment Mehg:thg Ratiomentioning

confidence: 97%

Section: Sediment Mehg:thg Ratiomentioning

confidence: 99%

See 3 more Smart Citations

Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

Ethier

Lean

Scheuhammer

et al. 2010

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

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The Influence of Littoral on Mercury Bioaccumulation in a Humic Lake

Lindholm

Wit

Eriksen

et al. 2014

Water Air Soil Pollut

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Mercury distribution in sediment along urban–rural gradient around Shanghai (China): implication for pollution history

Yang

Chen

Shi

et al. 2014

Environ Sci Pollut Res

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The increasing levels of heavy metals in the environment generally related with the rapid industrialization and urbanization. Mercury (Hg) is a global toxin with wide concerns, and China gradually becomes the main producer, consumer, and emitter of Hg in the world. However, few historical data are available on the occurrence of Hg in Chinese urban areas. Here, we collected 35 lake surface sediment samples from 35 public parks and 1 sediment core in the Luxun Park in Shanghai, a hyper-urbanization city in China, to determine the spatial and vertical distributions of total mercury (THg) and methylmercury (MeHg) and to explore the Hg pollution history with the industrial development. Higher concentrations of Hg and MeHg and greater Hg enrichment were found in urban areas compared with suburban area with the following order: central urban core area > developed urban area > developing urban area > suburban area. The THg concentration in the sediment core showed an increasing trend from 1876 to 2000 and a decreasing trend from 2000 to 2012, coinciding with the process of industrialization and urbanization in Shanghai. However, THg fluxes unceasingly increased from 1876 to present probably attributed to coal consumption in the suburban area and transportation agglomeration in the central urban core area. Unlike THg, no significant variations for MeHg with time and the maximum value (0.17 μg/kg) appeared in 1947. The methylation ratio of MeHg to THg in the sediment is pretty low, and more studies are needed to further understand the fate of Hg in the environment.

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Mercury empirical relationships in sediments from three Ontario lakes

Cited by 22 publications

References 35 publications

Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

The Influence of Littoral on Mercury Bioaccumulation in a Humic Lake

Mercury distribution in sediment along urban–rural gradient around Shanghai (China): implication for pollution history

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