Integrated Marine Information System (IMIS)

Data Policy
Persons | Institutes | Publications | Projects | Datasets
[ report an error in this record ]basket (1): add | show Print this page
one publication added to basket [213338]
Mercury speciation in marine sediments under sulfate-limited conditions
Han, S.; Narasingarao, P.; Obraztsova, A.; Gieskes, J.M.; Hartmann, A.C.; Tebo, B.M.; Allen, E.E.; Deheyn, D.D. (2010). Mercury speciation in marine sediments under sulfate-limited conditions. Environ. Sci. Technol. 44(10): 3752-3757. dx.doi.org/10.1021/es903112m
In: Environmental Science and Technology. American Chemical Society: Easton. ISSN 0013-936X; e-ISSN 1520-5851
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Authors  Top 
  • Han, S.
  • Narasingarao, P.
  • Obraztsova, A.
  • Gieskes, J.M.
  • Hartmann, A.C.
  • Tebo, B.M.
  • Allen, E.E.
  • Deheyn, D.D.
Abstract
    Sediment profiles of total mercury (Hg) and monomethylmercury (MMHg) were determined from a 30-m drill hole located north of Venice, Italy. While the sediment profile of total Hg concentration was fairly constant between 1 and 10 m, that of the MMHg concentration showed an unexpected peak at a depth of 6 m. Due to the limited sulfate content (<1 mM) at the depth of 6 m, we hypothesized that the methylation of inorganic Hg(II) at this depth is associated with the syntrophic processes occurring between methanogens and sulfidogens. To test this hypothesis, anoxic sediment slurries were prepared using buried Venice Lagoon sediments amended with HgCl2, and we monitored MMHg concentration in sediment slurries over time under two geochemical conditions: high sulfate (1-16 mM) and limited sulfate concentrations (<100 µM). After day 52 and onward from the addition of inorganic Hg(II), the MMHg concentrations were higher in sulfate-limited slurries compared to high sulfate slurries, along with methane production in both slurries. On the basis of these results, we argue that active methylation of inorganic Hg(II) occurs under sulfate-limited conditions possibly by syntrophic processes occurring between methanogens and sulfidogens. The environmental significance of syntrophic Hg(II) methylation should be further studied.
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors 
[Back]

WoRMS

Using WoRMS

Tools

Connect with us

This service is powered by LifeWatch Belgium
Learn more»
Website and databases developed and hosted by Flanders Marine Institute · Page generated on 2024-04-19 21:52:50+02:00 · Privacy and cookie policy