BER launches Environmental System Science Program. Visit our new website under construction!

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

BER Research Highlights

New Study Shows Form of Mercury in Fish Different From Previous Studies
Published: September 03, 2003
Posted: September 30, 2003

A new study at the Stanford Synchrotron Radiation Laboratory (SSRL) makes use of X-ray absorption spectroscopy (XAS) to identify the exact form of mercury found in two widely consumed species of fish, swordfish, and orange roughy. The results are featured in the August 29, 2003, issue of Science. The researchers found that mercury was present not as methylmercury chloride, but rather as a methylmercury compound in which the mercury atom is also bound to a sulfur atom, probably in the amino acid cysteine. The authors suggest that the health risk of eating fish contaminated with mercury should be determined based the toxicity of methylmercury cysteine, rather than calculated on the assumption that the mercury is present as methylmercury chloride. There is considerable public health interest in mercury. The element is associated with several diseases, notably the Minamata disease, a neurological disorder caused by eating fish highly contaminated with mercury. The toxicity of mercury depends on the chemical form of the element. Methylmercury chloride is considered to be especially toxic compared with, for example, elemental mercury and many other compounds of mercury. Thus it is essential not only to measure the amount of mercury in fish or other foodstuffs, which is not hard to do, but also to determine the amounts in its various chemical forms, which is much more difficult. (XAS) is one of the few techniques that can identify the species of elements such as mercury without extensive sample preparation.

Contact: Roland F. Hirsch, SC-73, (301) 903-9009
Topic Areas:

  • Research Area: Structural Biology Infrastructure
  • Research Area: Research Technologies and Methodologies

Division: SC-33.2 Biological Systems Science Division, BER
      (formerly SC-73 Medical Sciences Division, OBER)


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

Recent Highlights

Mar 23, 2021
Molecular Connections from Plants to Fungi to Ants
Lipids transfer energy and serve as an inter-kingdom communication tool in leaf-cutter ants&rsqu [more...]

Mar 19, 2021
Microbes Use Ancient Metabolism to Cycle Phosphorus
Microbial cycling of phosphorus through reduction-oxidation reactions is older and more widespre [more...]

Feb 22, 2021
Warming Soil Means Stronger Microbe Networks
Soil warming leads to more complex, larger, and more connected networks of microbes in those soi [more...]

Jan 27, 2021
Labeling the Thale Cress Metabolites
New data pipeline identifies metabolites following heavy isotope labeling.

Analysis [more...]

Aug 31, 2020
Novel Bacterial Clade Reveals Origin of Form I Rubisco

  • All plant biomass is sourced from the carbon-fixing enzyme Rub [more...]

List all highlights (possible long download time)