USGS visual identity mark and link to main Web site at http://www.usgs.gov/

The Effect of Natural Organic Matter on the Solubility and Colloid Chemistry of Mercury in the Presence of Sulfide: Aaron Slowey


Project Title: The Effect of Natural Organic Matter on the Solubility and Colloid Chemistry of Mercury in the Presence of Sulfide
Mendenhall Fellow: Aaron Slowey, (650) 329-5474, aslowey@usgs.gov
Duty Station: Menlo Park, CA
Start Date: October 1, 2007
Education: Ph.D., Environmental Geochemistry, Stanford University, 2006
Research Advisors: Andrea Foster, (650) 329-5437, afoster@usgs.gov; James Rytuba, (650) 329-5418, jrytuba@usgs.gov; Mark Marvin-DiPasquale, (650) 329-4442, mmarvin@usgs.gov
  Aaron Slowey

Project Description: Across a diverse range of aquatic systems, environmental influences on metal bioavailability are as likely to explain the variability of bioaccumulation as are biological species-specific factors.  Mercury concentrations in aquatic biota likely depend on the extent to which mercury is methylated by microorganisms, but what remains elusive is the fraction of mercury that is available to these microorganisms.  This knowledge gap limits our ability to assess ecological implications of energy and mineral resource development.  The objectives of this project are two-fold: develop in situ electrochemical methods to measure iron and sulfur species—proposed key master variables for mercury reactivity—in aquatic sediments and conduct fundamental investigations into the molecular-to-nanometer scale speciation and colloidal properties of mercury in the presence of organic matter and sulfide.

Diagram showing that the cycling of mercury, iron, and sulfur are interrelated in aquatic habitat.


Go back to Previous Profile   Project Profiles   Next Profile Go forward to

URL: http://geology.usgs.gov/postdoc/profiles/slowey/index.html
Direct inquiries to Rama K. Kotra at rkotra@usgs.gov
Page Contact Information: Mendenhall Postdoctoral Fellowship Program Web Team
Last modified: 16:08:32 Thu 13 Dec 2012