Display Settings:

Format

Send to:

Choose Destination
Chemosphere. 2007 Dec;70(2):329-36. Epub 2007 Nov 1.

Arsenic sequestration by nitrate respiring microbial communities in urban lake sediments.

Author information

  • 1Department of Microbiology, University of Massachusetts, Amherst, MA 01003, USA. bgibney@microbio.umass.edu

Abstract

Changes in microbial community composition and activity were related to geochemical conditions favoring arsenic sequestration in sediments collected from the urban, arsenic-contaminated Upper Mystic Lake. After amendment with nitrate, >94% total soluble arsenic is sequestered by Fe(III)-(oxy)hydroxides generated in live sediments. Of this sequestered arsenic, >75% existed as As(III), indicating As redox state alone is not responsible for changes in mobility. Arsenic sequestration was concurrent with the microbial respiration of nitrate as indicated by steady state hydrogen concentration and the presence of organisms similar to nitrate-reducing, iron-oxidizing bacteria belonging to the genus Dechloromonas in 16S rDNA clone libraries.

PMID:
17935754
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk