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USGS Staff Profile:

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   abstract: Research Chemist with the Upper Midwest Water Science Center
   additionalType: short description
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   abstract: Sarah Janssen is an isotope geochemist working in the Mercury Research
     Lab (MRL) located within the Upper Midwest Water Science Center.
   additionalType: staff profile page introductory statement
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   abstract: "She has a PhD in environmental chemistry from Rutgers University and\
     \ a bachelor\u2019s in chemistry fromUniversity 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 ProjectsMercury\
     \ 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"
   additionalType: personal statement
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