Sarah E Janssen
Sarah Janssen is an isotope geochemist working in the M3 Research Lab (MRL) located within the Upper Midwest Water Science Center.
She has a PhD in environmental chemistry from Rutgers University and a bachelor’s in chemistry from
University of the Sciences in Philadelphia. Her work focuses on the application of stable isotope techniques for understanding sources and transformations of mercury (Hg) in the environment. Her research interests include Hg cycling in contaminated ecosystems, the investigation of microbial Hg transformations using stable isotopes, and development of analytical methods to improve Hg isotope measurements.
Current Projects
- Mercury Cycling and Source Identification in the St Louis River Estuary MN/WI (collaboration with US EPA and Minnesota Pollution Control Agency)
- Mercury Isotope Fractionation during Microbial Uptake and Transformations of Hg (collaboration with Rutgers University and University of Ottawa)
- Method Development for the Pre-concentration of Waters and Low Concentration Environmental Samples for Mercury Isotopic Analysis
Education and Certifications
Ph.D. 2016, Environmental Chemistry, Rutgers University, New Brunswick, NJ
B.S. 2011, Chemistry, University of the Sciences, Philadelphia, PA
Science and Products
Filter Total Items: 42
Isolation of Methylmercury Using Distillation and Anion-Exchange Chromatography for Isotopic Analyses in Natural Matrices Data Release Isolation of Methylmercury Using Distillation and Anion-Exchange Chromatography for Isotopic Analyses in Natural Matrices Data Release
This dataset consists of concentration and isotopic data for a method designed to isolate and analyze methylmercury. Several matrices (lab-based, and natural) were tested to ensure that the method was capable of recovering methylmercury amendments. Additionally, natural matrices (plankton and sediment) with ambient methylmercury were also analyzed to ensure that the method could be...
Gruber's Grove Bay Mercury Site Assessment Gruber's Grove Bay Mercury Site Assessment
Mercury (Hg) concentrations and isotopic compositions were collected in sediments, soils, and suspended particulate matter from Gruber's Grove Bay (GGB) and upstream reference sites to inform future remedial efforts. The highest concentrations and isotopic signatures were observed in soils collected from historic water settling ponds from the Badger Army Ammunition Plant (BAAP)...
Regional Trends of Isotopic Composition in Total Gaseous Mercury Across the United States Regional Trends of Isotopic Composition in Total Gaseous Mercury Across the United States
The dataset presented here represents the concentrations and stable isotopic composition of gaseous mercury (Hg) for 31 sites across the United States. This national-scale monitoring effort was performed by the National Atmospheric Deposition Program (NADP) and the USGS over a two-year period (March 2016 - May 2018). The network includes a highly diverse set of sites ranging from remote...
Stable Mercury Isotopic Analyses in Natural Matrices via Rapid Pre-Concentration Method Stable Mercury Isotopic Analyses in Natural Matrices via Rapid Pre-Concentration Method
This data relates to the development of a modified pre-concentration method for mercury (Hg) stable isotope measurements that uses chemical Hg reduction and gold trap amalgamation followed by semi-rapid thermal desorption (less than 1 hour) and chemical trapping in a novel oxidizing solution. The thermal desorption method was demonstrated to perform adequately on multiple trapping...
Fox River walleye mercury isotope data Fox River walleye mercury isotope data
Adult walleye were caught in Fox River (Wisconsin) during April 2014. Age-0 walleye were caught in Fox River during October 2014. Total length, weight, age, and proportion of weight represented by water were determined for each of the walleye. Whole-fish homogenates were prepared during 2014-2015 and during 2017. Total mercury (HgT) concentration, methylmercury (MeHg) concentration, and...
Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016 Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016
This dataset includes the field measurements and laboratory analyses of surface water, seston, fish tissue, and sediment samples collected from Bighorn Lake, within Bighorn Canyon National Recreation area (BICA), during high flow (July 2015) and low flow (August 2016) conditions. The study area includes 7-9 sampling sites that follow a transect spanning the entire length of the reservoir...
Filter Total Items: 61
Can preserved museum specimens be to be used to reconstruct fish mercury burden and sources through time? Can preserved museum specimens be to be used to reconstruct fish mercury burden and sources through time?
To evaluate the utility of preserved fishes for reconstructing historical and spatial patterns of mercury (Hg) exposure, we experimentally tested the stability of Hg concentrations and Hg stable isotope ratios under standard museum practices of specimen preservation. We found that loss of unidentified constituents during preservation changed Hg concentrations in fish muscle. Fish reared...
Authors
Ryan F. Lepak, Sarah E. Janssen, Jacob M. Ogorek, Casey B. Dillman, Joel C. Hoffman, Michael T. Tate, Peter B. McIntyre
Tracing the sources and depositional history of mercury to coastal northeastern U.S. lakes Tracing the sources and depositional history of mercury to coastal northeastern U.S. lakes
Mercury (Hg) deposition was reconstructed in sediment cores from lakes in two coastal U.S. National Parks: Acadia National Park (ANP) and Cape Cod National Seashore (CCNS), to fill an important spatial gap in Hg deposition records and to explore changing sources of Hg and processes affecting Hg accumulation in these coastal sites. Recent Hg deposition chronology was assessed using (1) a...
Authors
Vivien F. Taylor, Joshua D. Landis, Sarah E. Janssen
Elevated mercury concentrations and isotope signatures (N, C, Hg) in yellowfin tuna (Thunnus albacares) from the Galápagos Marine Reserve and waters off Ecuador Elevated mercury concentrations and isotope signatures (N, C, Hg) in yellowfin tuna (Thunnus albacares) from the Galápagos Marine Reserve and waters off Ecuador
We examined how dietary factors recorded by C and N influence Hg uptake in 347 individuals of yellowfin tuna (Thunnus albacares), an important subsistence resource from the Galápagos Marine Reserve (GMR) and the Ecuadorian mainland coast (EMC) in 2015-2016. We found no differences in total Hg (THg) measured in red muscle between the two regions and no seasonal differences, likely due to...
Authors
Laia Munoz-Abril, Carlos A Valle, Juan Jose Alava, Sarah E. Janssen, Elsie M. Sunderland, Francisco Rubianes-Landazuri, Steven D Emslie
Assessment of mercury in sediments and waters of Grubers Grove Bay, Wisconsin Assessment of mercury in sediments and waters of Grubers Grove Bay, Wisconsin
Mercury is a global contaminant that can be detrimental to wildlife and human health. Anthropogenic emissions and point sources are primarily responsible for elevated mercury concentrations in sediments and waters. Mercury can physically move and chemically transform in the environment, resulting in biomagnification of mercury, in the form of methylmercury, in the food web and causing...
Authors
Evan J. Routhier, Sarah E. Janssen, Michael T. Tate, Jacob M. Ogorek, John F. DeWild, David P. Krabbenhoft
Decadal trends of mercury cycling and bioaccumulation within Everglades National Park Decadal trends of mercury cycling and bioaccumulation within Everglades National Park
Mercury (Hg) contamination has been a persistent concern in the Florida Everglades for over three decades due to elevated atmospheric deposition and the system's propensity for methylation and rapid bioaccumulation. Given declines in atmospheric Hg concentrations in the conterminous United States and efforts to mitigate nutrient release to the greater Everglades ecosystem, it was vital...
Authors
Sarah E. Janssen, Michael T. Tate, Brett A. Poulin, David P. Krabbenhoft, John F DeWild, Jacob M. Ogorek, Matthew S. Varonka, William H. Orem, Jeffrey D Kline
Methylmercury stable isotopes: New insights on assessing aquatic food web bioaccumulation in legacy impacted regions Methylmercury stable isotopes: New insights on assessing aquatic food web bioaccumulation in legacy impacted regions
Through stable isotope measurements of total mercury (HgT), identification of crucial processes and transformations affecting different sources of mercury (Hg) has become possible. However, attempting to use HgT stable isotopes to track bioaccumulation of Hg sources among different food web compartments can be challenging, if not impossible, when tissues have varying methylmercury (MeHg)...
Authors
Tylor Rosera, Sarah E. Janssen, Michael T. Tate, Ryan F. Lepak, Jacob M. Ogorek, John F. DeWild, David P. Krabbenhoft, James P. Hurley
Using carbon, nitrogen, and mercury isotope values to distinguish mercury sources to Alaskan lake trout Using carbon, nitrogen, and mercury isotope values to distinguish mercury sources to Alaskan lake trout
Lake trout (Salvelinus namaycush), collected from 13 remote lakes located in southwestern Alaska, were analyzed for carbon, nitrogen, and mercury (Hg) stable isotope values to assess the importance of migrating oceanic salmon, volcanic activity, and atmospheric deposition to fish Hg burden. Methylmercury (MeHg) bioaccumulation in phytoplankton (5.0–6.9 kg L–1) was also measured to...
Authors
Ryan F. Lepak, Jacob M. Ogorek, Krista K. Bartz, Sarah E. Janssen, Michael T. Tate, Yin Runsheng, James P. Hurley, Daniel Young, Collin A. Eagles-Smith, David P. Krabbenhoft
Response to comment on “Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science”: Principles and limitations of source tracing and process tracing with stable isot Response to comment on “Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science”: Principles and limitations of source tracing and process tracing with stable isot
No abstract available.
Authors
Alain Manceau, Romain Brossier, Sarah E. Janssen, Brett A. Poulin
Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science
A prerequisite for environmental and toxicological applications of mercury (Hg) stable isotopes in wildlife and humans is quantifying the isotopic fractionation of biological reactions. Here, we measured stable Hg isotope values of relevant tissues of giant petrels (Macronectes spp.). Isotopic data were interpreted with published HR-XANES spectroscopic data that document a stepwise...
Authors
Alain Manceau, Romain Brossier, Sarah E. Janssen, Tylor Rosera, David P. Krabbenhoft, Yves Cherel, Paco Bustamante, Brett A. Poulin
Isotope fractionation from In Vivo methylmercury detoxification in waterbirds Isotope fractionation from In Vivo methylmercury detoxification in waterbirds
The robust application of stable mercury (Hg) isotopes for mercury source apportionment and risk assessment necessitates the understanding of mass-dependent fractionation (MDF) due to internal transformations within organisms. Here, we used high energy-resolution XANES spectroscopy and isotope ratios of total mercury (δ202THg) and methylmercury (δ202MeHg) to elucidate the chemical...
Authors
Brett A. Poulin, Sarah Elizabeth Janssen, Tylor Rosera, David P. Krabbenhoft, Collin A. Eagles-Smith, Joshua T. Ackerman, Robin Stewart, Eunhee Kim, Zofia Baumann, Jeong-Hoon Kim, Alain Manceau
Examining historical mercury sources in the Saint Louis River estuary: How legacy contamination influences biological mercury levels in Great Lakes coastal regions Examining historical mercury sources in the Saint Louis River estuary: How legacy contamination influences biological mercury levels in Great Lakes coastal regions
Industrial chemical contamination within coastal regions of the Great Lakes can pose serious risks to wetland habitat and offshore fisheries, often resulting in fish consumption advisories that directly affect human and wildlife health. Mercury (Hg) is a contaminant of concern in many of these highly urbanized and industrialized coastal regions, one of which is the Saint Louis River...
Authors
Sarah E. Janssen, Joel C. Hoffman, Ryan F. Lepak, David P. Krabbenhoft, David M. Walters, Collin A. Eagles-Smith, Greg Peterson, Jacob M. Ogorek, John F. DeWild, Anne M Cotter, Mark Pearson, Michael T. Tate, Roger B. Yeardley, Marc A. Mills
Stable isotope fractionation reveals similar atomic-level controls during aerobic and anaerobic microbial Hg transformation pathways Stable isotope fractionation reveals similar atomic-level controls during aerobic and anaerobic microbial Hg transformation pathways
Mercury (Hg) is a global pollutant and potent neurotoxin that bioaccumulates in food webs as monomethylmercury (MeHg). The production of MeHg is driven by anaerobic and Hg redox cycling pathways, such as Hg reduction, which control the availability of Hg to methylators. Anaerobes play an important role in Hg reduction in methylation hot spots, yet their contributions remain...
Authors
Daniel S. Gregiore, Sarah E. Janssen, Noemie C. Lavoie, Michael T. Tate, Alexandre J. Poulain
Non-USGS Publications**
Janssen, S.E.; Johnson, M.W.; Blum, J.D.; Barkay, T.; Reinfelder, J.R., Separation of monomethylmercury from estuarine sediments for mercury isotope analysis. Chemical Geology 2015
Janssen, S.E.; Schaefer, J.K.; Barkay, T.; Reinfelder, J.R. Fractionation of mercury stable isotopes during microbial methylmercury production in pure culture. Environ. Sci. Technol. 2016
Lloyd, N.; Janssen, S.E.; Reinfelder J.R.; Barkay, T., Exposure to mercury selects for antibiotic resistance in Fundulus heteroclitus gut microbiome, Current Microbiology, 2016
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 42
Isolation of Methylmercury Using Distillation and Anion-Exchange Chromatography for Isotopic Analyses in Natural Matrices Data Release Isolation of Methylmercury Using Distillation and Anion-Exchange Chromatography for Isotopic Analyses in Natural Matrices Data Release
This dataset consists of concentration and isotopic data for a method designed to isolate and analyze methylmercury. Several matrices (lab-based, and natural) were tested to ensure that the method was capable of recovering methylmercury amendments. Additionally, natural matrices (plankton and sediment) with ambient methylmercury were also analyzed to ensure that the method could be...
Gruber's Grove Bay Mercury Site Assessment Gruber's Grove Bay Mercury Site Assessment
Mercury (Hg) concentrations and isotopic compositions were collected in sediments, soils, and suspended particulate matter from Gruber's Grove Bay (GGB) and upstream reference sites to inform future remedial efforts. The highest concentrations and isotopic signatures were observed in soils collected from historic water settling ponds from the Badger Army Ammunition Plant (BAAP)...
Regional Trends of Isotopic Composition in Total Gaseous Mercury Across the United States Regional Trends of Isotopic Composition in Total Gaseous Mercury Across the United States
The dataset presented here represents the concentrations and stable isotopic composition of gaseous mercury (Hg) for 31 sites across the United States. This national-scale monitoring effort was performed by the National Atmospheric Deposition Program (NADP) and the USGS over a two-year period (March 2016 - May 2018). The network includes a highly diverse set of sites ranging from remote...
Stable Mercury Isotopic Analyses in Natural Matrices via Rapid Pre-Concentration Method Stable Mercury Isotopic Analyses in Natural Matrices via Rapid Pre-Concentration Method
This data relates to the development of a modified pre-concentration method for mercury (Hg) stable isotope measurements that uses chemical Hg reduction and gold trap amalgamation followed by semi-rapid thermal desorption (less than 1 hour) and chemical trapping in a novel oxidizing solution. The thermal desorption method was demonstrated to perform adequately on multiple trapping...
Fox River walleye mercury isotope data Fox River walleye mercury isotope data
Adult walleye were caught in Fox River (Wisconsin) during April 2014. Age-0 walleye were caught in Fox River during October 2014. Total length, weight, age, and proportion of weight represented by water were determined for each of the walleye. Whole-fish homogenates were prepared during 2014-2015 and during 2017. Total mercury (HgT) concentration, methylmercury (MeHg) concentration, and...
Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016 Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016
This dataset includes the field measurements and laboratory analyses of surface water, seston, fish tissue, and sediment samples collected from Bighorn Lake, within Bighorn Canyon National Recreation area (BICA), during high flow (July 2015) and low flow (August 2016) conditions. The study area includes 7-9 sampling sites that follow a transect spanning the entire length of the reservoir...
Filter Total Items: 61
Can preserved museum specimens be to be used to reconstruct fish mercury burden and sources through time? Can preserved museum specimens be to be used to reconstruct fish mercury burden and sources through time?
To evaluate the utility of preserved fishes for reconstructing historical and spatial patterns of mercury (Hg) exposure, we experimentally tested the stability of Hg concentrations and Hg stable isotope ratios under standard museum practices of specimen preservation. We found that loss of unidentified constituents during preservation changed Hg concentrations in fish muscle. Fish reared...
Authors
Ryan F. Lepak, Sarah E. Janssen, Jacob M. Ogorek, Casey B. Dillman, Joel C. Hoffman, Michael T. Tate, Peter B. McIntyre
Tracing the sources and depositional history of mercury to coastal northeastern U.S. lakes Tracing the sources and depositional history of mercury to coastal northeastern U.S. lakes
Mercury (Hg) deposition was reconstructed in sediment cores from lakes in two coastal U.S. National Parks: Acadia National Park (ANP) and Cape Cod National Seashore (CCNS), to fill an important spatial gap in Hg deposition records and to explore changing sources of Hg and processes affecting Hg accumulation in these coastal sites. Recent Hg deposition chronology was assessed using (1) a...
Authors
Vivien F. Taylor, Joshua D. Landis, Sarah E. Janssen
Elevated mercury concentrations and isotope signatures (N, C, Hg) in yellowfin tuna (Thunnus albacares) from the Galápagos Marine Reserve and waters off Ecuador Elevated mercury concentrations and isotope signatures (N, C, Hg) in yellowfin tuna (Thunnus albacares) from the Galápagos Marine Reserve and waters off Ecuador
We examined how dietary factors recorded by C and N influence Hg uptake in 347 individuals of yellowfin tuna (Thunnus albacares), an important subsistence resource from the Galápagos Marine Reserve (GMR) and the Ecuadorian mainland coast (EMC) in 2015-2016. We found no differences in total Hg (THg) measured in red muscle between the two regions and no seasonal differences, likely due to...
Authors
Laia Munoz-Abril, Carlos A Valle, Juan Jose Alava, Sarah E. Janssen, Elsie M. Sunderland, Francisco Rubianes-Landazuri, Steven D Emslie
Assessment of mercury in sediments and waters of Grubers Grove Bay, Wisconsin Assessment of mercury in sediments and waters of Grubers Grove Bay, Wisconsin
Mercury is a global contaminant that can be detrimental to wildlife and human health. Anthropogenic emissions and point sources are primarily responsible for elevated mercury concentrations in sediments and waters. Mercury can physically move and chemically transform in the environment, resulting in biomagnification of mercury, in the form of methylmercury, in the food web and causing...
Authors
Evan J. Routhier, Sarah E. Janssen, Michael T. Tate, Jacob M. Ogorek, John F. DeWild, David P. Krabbenhoft
Decadal trends of mercury cycling and bioaccumulation within Everglades National Park Decadal trends of mercury cycling and bioaccumulation within Everglades National Park
Mercury (Hg) contamination has been a persistent concern in the Florida Everglades for over three decades due to elevated atmospheric deposition and the system's propensity for methylation and rapid bioaccumulation. Given declines in atmospheric Hg concentrations in the conterminous United States and efforts to mitigate nutrient release to the greater Everglades ecosystem, it was vital...
Authors
Sarah E. Janssen, Michael T. Tate, Brett A. Poulin, David P. Krabbenhoft, John F DeWild, Jacob M. Ogorek, Matthew S. Varonka, William H. Orem, Jeffrey D Kline
Methylmercury stable isotopes: New insights on assessing aquatic food web bioaccumulation in legacy impacted regions Methylmercury stable isotopes: New insights on assessing aquatic food web bioaccumulation in legacy impacted regions
Through stable isotope measurements of total mercury (HgT), identification of crucial processes and transformations affecting different sources of mercury (Hg) has become possible. However, attempting to use HgT stable isotopes to track bioaccumulation of Hg sources among different food web compartments can be challenging, if not impossible, when tissues have varying methylmercury (MeHg)...
Authors
Tylor Rosera, Sarah E. Janssen, Michael T. Tate, Ryan F. Lepak, Jacob M. Ogorek, John F. DeWild, David P. Krabbenhoft, James P. Hurley
Using carbon, nitrogen, and mercury isotope values to distinguish mercury sources to Alaskan lake trout Using carbon, nitrogen, and mercury isotope values to distinguish mercury sources to Alaskan lake trout
Lake trout (Salvelinus namaycush), collected from 13 remote lakes located in southwestern Alaska, were analyzed for carbon, nitrogen, and mercury (Hg) stable isotope values to assess the importance of migrating oceanic salmon, volcanic activity, and atmospheric deposition to fish Hg burden. Methylmercury (MeHg) bioaccumulation in phytoplankton (5.0–6.9 kg L–1) was also measured to...
Authors
Ryan F. Lepak, Jacob M. Ogorek, Krista K. Bartz, Sarah E. Janssen, Michael T. Tate, Yin Runsheng, James P. Hurley, Daniel Young, Collin A. Eagles-Smith, David P. Krabbenhoft
Response to comment on “Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science”: Principles and limitations of source tracing and process tracing with stable isot Response to comment on “Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science”: Principles and limitations of source tracing and process tracing with stable isot
No abstract available.
Authors
Alain Manceau, Romain Brossier, Sarah E. Janssen, Brett A. Poulin
Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science Mercury isotope fractionation by internal demethylation and biomineralization reactions in seabirds: Implications for environmental mercury science
A prerequisite for environmental and toxicological applications of mercury (Hg) stable isotopes in wildlife and humans is quantifying the isotopic fractionation of biological reactions. Here, we measured stable Hg isotope values of relevant tissues of giant petrels (Macronectes spp.). Isotopic data were interpreted with published HR-XANES spectroscopic data that document a stepwise...
Authors
Alain Manceau, Romain Brossier, Sarah E. Janssen, Tylor Rosera, David P. Krabbenhoft, Yves Cherel, Paco Bustamante, Brett A. Poulin
Isotope fractionation from In Vivo methylmercury detoxification in waterbirds Isotope fractionation from In Vivo methylmercury detoxification in waterbirds
The robust application of stable mercury (Hg) isotopes for mercury source apportionment and risk assessment necessitates the understanding of mass-dependent fractionation (MDF) due to internal transformations within organisms. Here, we used high energy-resolution XANES spectroscopy and isotope ratios of total mercury (δ202THg) and methylmercury (δ202MeHg) to elucidate the chemical...
Authors
Brett A. Poulin, Sarah Elizabeth Janssen, Tylor Rosera, David P. Krabbenhoft, Collin A. Eagles-Smith, Joshua T. Ackerman, Robin Stewart, Eunhee Kim, Zofia Baumann, Jeong-Hoon Kim, Alain Manceau
Examining historical mercury sources in the Saint Louis River estuary: How legacy contamination influences biological mercury levels in Great Lakes coastal regions Examining historical mercury sources in the Saint Louis River estuary: How legacy contamination influences biological mercury levels in Great Lakes coastal regions
Industrial chemical contamination within coastal regions of the Great Lakes can pose serious risks to wetland habitat and offshore fisheries, often resulting in fish consumption advisories that directly affect human and wildlife health. Mercury (Hg) is a contaminant of concern in many of these highly urbanized and industrialized coastal regions, one of which is the Saint Louis River...
Authors
Sarah E. Janssen, Joel C. Hoffman, Ryan F. Lepak, David P. Krabbenhoft, David M. Walters, Collin A. Eagles-Smith, Greg Peterson, Jacob M. Ogorek, John F. DeWild, Anne M Cotter, Mark Pearson, Michael T. Tate, Roger B. Yeardley, Marc A. Mills
Stable isotope fractionation reveals similar atomic-level controls during aerobic and anaerobic microbial Hg transformation pathways Stable isotope fractionation reveals similar atomic-level controls during aerobic and anaerobic microbial Hg transformation pathways
Mercury (Hg) is a global pollutant and potent neurotoxin that bioaccumulates in food webs as monomethylmercury (MeHg). The production of MeHg is driven by anaerobic and Hg redox cycling pathways, such as Hg reduction, which control the availability of Hg to methylators. Anaerobes play an important role in Hg reduction in methylation hot spots, yet their contributions remain...
Authors
Daniel S. Gregiore, Sarah E. Janssen, Noemie C. Lavoie, Michael T. Tate, Alexandre J. Poulain
Non-USGS Publications**
Janssen, S.E.; Johnson, M.W.; Blum, J.D.; Barkay, T.; Reinfelder, J.R., Separation of monomethylmercury from estuarine sediments for mercury isotope analysis. Chemical Geology 2015
Janssen, S.E.; Schaefer, J.K.; Barkay, T.; Reinfelder, J.R. Fractionation of mercury stable isotopes during microbial methylmercury production in pure culture. Environ. Sci. Technol. 2016
Lloyd, N.; Janssen, S.E.; Reinfelder J.R.; Barkay, T., Exposure to mercury selects for antibiotic resistance in Fundulus heteroclitus gut microbiome, Current Microbiology, 2016
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.