Sarah E Janssen
Sarah Janssen is an isotope geochemist working in the Mercury 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
Mercury concentrations and isotopic compositions in biota and sediments from the Hannibal Pool of the Ohio River
Mercury Concentrations and Isotopic Compositions in Sediment Cores from North American Lakes (Alaska, Minnesota, and Newfoundland)
Isolation of Methylmercury Using Distillation and Anion-Exchange Chromatography for Isotopic Analyses in Natural Matrices Data Release
Gruber's Grove Bay Mercury Site Assessment
Regional Trends of Isotopic Composition in Total Gaseous Mercury Across the United States
Stable Mercury Isotopic Analyses in Natural Matrices via Rapid Pre-Concentration Method
Fox River walleye mercury isotope data
Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016
Tracing the uptake of Hg(II) in an iron-reducing bacterium using mercury stable isotopes
Mercury, cadmium, copper, arsenic, and selenium measurements in the feathers of adult eastern brown pelicans (Pelecanus occidentalis carolinensis) and chicks in multiple breeding grounds in the northern Gulf of Mexico
Isolation of methylmercury using distillation and anion-exchange chromatography for isotopic analyses in natural matrices
The assessment and remediation of mercury contaminated sites: A review of current approaches
Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan
Chemical and physical controls on mercury source signatures in stream fish from the northeastern United States
Tracking legacy mercury in the Hackensack River Estuary using mercury stable isotopes
Rapid pre-concentration of mercury in solids and water for isotopic analysis
Mercury isotopes reveal an ontogenetic shift in habitat use by walleye in lower Green Bay of Lake Michigan
Factors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes
Non-USGS Publications**
**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
Mercury concentrations and isotopic compositions in biota and sediments from the Hannibal Pool of the Ohio River
Mercury Concentrations and Isotopic Compositions in Sediment Cores from North American Lakes (Alaska, Minnesota, and Newfoundland)
Isolation of Methylmercury Using Distillation and Anion-Exchange Chromatography for Isotopic Analyses in Natural Matrices Data Release
Gruber's Grove Bay Mercury Site Assessment
Regional Trends of Isotopic Composition in Total Gaseous Mercury Across the United States
Stable Mercury Isotopic Analyses in Natural Matrices via Rapid Pre-Concentration Method
Fox River walleye mercury isotope data
Data for Biogeochemical and Physical Processes Controlling Mercury and Selenium Bioaccumulation in Bighorn Lake, Bighorn Canyon National Recreation Area, Montana and Wyoming, 2015-2016
Tracing the uptake of Hg(II) in an iron-reducing bacterium using mercury stable isotopes
Mercury, cadmium, copper, arsenic, and selenium measurements in the feathers of adult eastern brown pelicans (Pelecanus occidentalis carolinensis) and chicks in multiple breeding grounds in the northern Gulf of Mexico
Isolation of methylmercury using distillation and anion-exchange chromatography for isotopic analyses in natural matrices
The assessment and remediation of mercury contaminated sites: A review of current approaches
Mercury source changes and food web shifts alter contamination signatures of predatory fish from Lake Michigan
Chemical and physical controls on mercury source signatures in stream fish from the northeastern United States
Tracking legacy mercury in the Hackensack River Estuary using mercury stable isotopes
Rapid pre-concentration of mercury in solids and water for isotopic analysis
Mercury isotopes reveal an ontogenetic shift in habitat use by walleye in lower Green Bay of Lake Michigan
Factors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes
Non-USGS Publications**
**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.