Sediment organic carbon and temperature effects on methylmercury concentration: A mesocosm experiment

Buckman, Kate L.; Seelen, Emily; Balcom, Prentiss H.; Taylor, Vivien F.; Ward, J. Evan; Chen, C.Y.

doi:10.1016/j.scitotenv.2019.02.302

Cited by 21 publications

(4 citation statements)

References 60 publications

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“…Researchers were able to achieve a detection limit of 1.5 ng/g for THg and MeHg with an initial mass of 0.1 g (Amirbahman et al 2013). Buckman et al (2019) investigated the fate and mobility of MeHg from soils to amphipods and oysters based on the effects of organic carbon percentage and soil temperature. They analyzed pooled 60 amphipods per analytical sample (estimated mass of approximately 0.2-0.25 g) and determined the MeHg and inorganic Hg (iHg) by a commercial laboratory that provides species-specific isotopes measured using two inductively coupled plasma mass spectrometry (ICP-MS) instruments.…”

Section: Methylmercurymentioning

confidence: 99%

Overview of microscale analytical methods for the quantitative detection of bioaccumulative contaminants in small tissue masses

Laber,

Lotufo,

Scircle

et al. 2024

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For many bioaccumulation studies, generation of large sample masses of exposed organisms is challenging or even prohibitive. Therefore, the use of smaller sample masses for analysis without compromising data quality or quantitative level achieved is desirable. To this end, a variety of microanalytical procedures have been developed that used 1 g or less of tissue to address specific experimental challenges. However, these methods have not been systematically evaluated or published. The present work evaluates the current state of the microanalytical methods reported and identifies additional needs that would benefit US Army Corps of Engineers (USACE) research and navigation dredging programs. Discussions with commercial laboratories revealed that they typically do not accept small sample masses and require individual sample masses ranging from 10 to 20 g wet weight of tissue per analysis. If they do analyze a small mass sample, they routinely do not modify their standard process, resulting in detection and reporting limits orders of magnitude higher; therefore, essentially useless nondetect data are generated for regulatory decisions. To address the lack of commercial availability of microanalytical methods, we recommend pursuing method development and subsequent validation of microscale extraction and analysis of a variety of common contaminant compounds in tissue matrices.

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Section: Methylmercurymentioning

confidence: 99%

Overview of microscale analytical methods for the quantitative detection of bioaccumulative contaminants in small tissue masses

Laber,

Lotufo,

Scircle

et al. 2024

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“…But what happens to settled particles containing T-Hg and MeHg? According to several studies, MeHg concentrations in bulk estuarine/marine sediments are not related to MeHg concentrations in the water column (Taylor et al, 2019) and are not the primary determinants of MeHg entry into the food web (Amirbahman et al, 2013;Buckman et al, 2019). Instead, in some north Atlantic estuaries with low SPM concentrations and a high proportion of dissolved MeHg relative to particulate MeHg, MeHg levels in biota were found to be strongly related to dissolved MeHg concentrations (Taylor et al, 2019).…”

Section: Organic Matter Loadings In the Estuarine Carbon Cycle: The Relative Importance Of Flocculationmentioning

confidence: 99%

“…Instead, in some north Atlantic estuaries with low SPM concentrations and a high proportion of dissolved MeHg relative to particulate MeHg, MeHg levels in biota were found to be strongly related to dissolved MeHg concentrations (Taylor et al, 2019). This suggests that, once settled, Hg particles are not susceptible to rapid recycling and that remaining MeHg loads from catchment runoff (rather than direct exposure to the sediment itself), is the main source of bioaccumulation in food webs (Jonsson et al, 2014;Buckman et al, 2019). This corroborates the results obtained by Jokinen et al (2020), which show sediment sequestration in the estuary for terrestrial OM, ferrihydrite, Cd, Pb, Sn, and Zn.…”

Section: Organic Matter Loadings In the Estuarine Carbon Cycle: The Relative Importance Of Flocculationmentioning

confidence: 99%

Mercury Export From Freshwater to Estuary: Carbocentric Science Elucidates the Fate of a Toxic Compound in Aquatic Boreal Environments

Demarty¹,

Bilodeau

Tremblay

2021

Front. Environ. Sci.

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The chemistry of mercury in freshwater systems, particularly man-made reservoirs, has received a great deal of attention owing to the high toxicity of the most common organic form, methylmercury. Although methylmercury bioaccumulation in reservoirs and natural lakes has been extensively studied at all latitudes, the fate of the different forms of mercury (total vs. dissolved; organic vs. inorganic) along the entire river-estuary continuum is less well documented. In fact, the difficulty of integrating the numerous parameters involved in mercury speciation in such large study areas, combined with the technical difficulties in sampling and analyzing mercury, have undoubtedly hindered advances in the field. At the same time, carbocentric science has grown exponentially in the last 25 years, and the common fate of carbon and mercury in freshwater has become increasingly clear with time. This literature review, by presenting the knowledge acquired in these two fields, aims to better understand the extent of mercury export from boreal inland waters to estuaries and to investigate the possible downstream ecotoxicological impact of reservoir creation on mercury bioavailability to estuarine food webs and local communities.

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“…However, predicting the risk posed by MeHg in sediment to aquatic animals is challenging because the concentration of MeHg in bulk sediment alone is insufficient to assess MeHg accumulation by aquatic animals and trophic connections in estuarine food webs are complex. MeHg produced in salt marsh sediment can diffuse into the water column and enter pelagic food webs through the uptake by phytoplankton. − However, a large proportion of the diets of young-of-the-year fish (YOY, <1 year old) that reside in estuaries is derived from benthic prey before their ontogenetic shift. , Benthic animals such annelids and small crustaceans might directly accumulate MeHg from sediments. However, a potentially important MeHg accumulation pathway by YOY fish from MeHg in salt marsh sediments through the consumption of benthic organisms has not yet been studied.…”

Section: Introductionmentioning

confidence: 99%

Grass Shrimp (Palaemonetes pugio) as a Trophic Link for Methylmercury Accumulation in Urban Salt Marshes

Wallace

Reinfelder

2022

Environ. Sci. Technol.

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Grass shrimp (Palaemonetes pugio) represent a potential link in the transfer of methylmercury (MeHg) from salt marsh sediments to transient young-of-the-year (YOY) fish. Across six salt marshes subject to varying degrees of Hg contamination, MeHg concentration in grass shrimp was significantly correlated with MeHg in sediment (p < 0.05, R 2 = 0.81). Bioenergetic models show that grass shrimp alone account for 12–90% of MeHg observed in YOY striped bass and 6–22% of MeHg in YOY summer flounder. Direct accumulation of MeHg from grass shrimp to YOY fish increased with MeHg levels in grass shrimp and sediment. However, in the most contaminated salt marshes with the highest levels of MeHg in grass shrimp and sediment, indirect accumulation of MeHg from grass shrimp by YOY summer flounder, whose diet is dominated by benthic forage fish (mummichog), is predicted to plateau because higher concentrations of MeHg in grass shrimp are offset by a lower proportion of grass shrimp in the mummichog diet. Our results demonstrate that grass shrimp are an important trophic link in the bioaccumulation of MeHg in salt marsh food webs and that MeHg accumulation in YOY fish varies with both the concentration of MeHg in salt marsh sediments and benthic food web structure.

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Sediment organic carbon and temperature effects on methylmercury concentration: A mesocosm experiment

Cited by 21 publications

References 60 publications

Overview of microscale analytical methods for the quantitative detection of bioaccumulative contaminants in small tissue masses

Overview of microscale analytical methods for the quantitative detection of bioaccumulative contaminants in small tissue masses

Mercury Export From Freshwater to Estuary: Carbocentric Science Elucidates the Fate of a Toxic Compound in Aquatic Boreal Environments

Grass Shrimp (Palaemonetes pugio) as a Trophic Link for Methylmercury Accumulation in Urban Salt Marshes

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