U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights

Visualizing Mercury on Surface of Freshwater Particulates
Published: September 30, 2014
Posted: October 03, 2014

Suspended particulates are primarily responsible for the transport of mercury and toxic methylmercury in freshwater systems; however, little is known about how mercury interacts with particulates. Mercury interactions with phytoplankton and colloidal minerals, two common types of particulates known to be involved in binding and transporting mercury, were studied by a team of scientists from Oak Ridge National Laboratory and Argonne National Laboratory using X-ray fluorescence (XRF) spectroscopy. Using samples from a mercury-contaminated freshwater system, the team found that mercury is mostly found on the outer surface of phytoplankton cells (diatoms) and that it is heterogeneously distributed on mineral particles rich in iron oxides and natural organic matter (NOM). The findings confirm that suspended particles, especially diatoms and NOM-coated oxide minerals, are important sinks for mercury in freshwater systems.

Reference: Gu, B., B. Mishra, C. Miller, W. Wang, B. Lai, S. C. Brooks, K. M. Kemner, and L. Liang. 2014. “X-Ray Fluorescence Mapping of Mercury on Suspended Mineral Particles and Diatoms in a Contaminated Freshwater System,” Biogeosciences Discussion 11, 7521-40. DOI:10.5194/bgd-11-7521-2014. (Reference link)

Contact: Paul E. Bayer, SC-23.1, (301) 903-5324
Topic Areas:

  • Research Area: Subsurface Biogeochemical Research
  • Research Area: Microbes and Communities
  • Research Area: Research Technologies and Methodologies

Division: SC-23.1 Climate and Environmental Sciences Division, BER


BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)