AMS of heavy elements with an ECR ion source and the ATLAS linear accelerator.

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Understanding the fate of heavy-metal contaminants in the environment is of fundamental importance in the development and evaluation of effective remediation and sequestration strategies. Among the factors influencing the transport of these contaminants are their chemical speciation and the chemical and physical attributes of the surrounding medium. Bacteria and the extracellular material associated with them are thought to play a key role in determining a contaminant's speciation and thus its mobility in the environment. In addition, the microenvironment at and adjacent to actively metabolizing cell surfaces can be significantly different from the bulk environment. Thus, the spatial distribution and chemical ... continued below

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14 p.

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Paul, M.; Berkovits, D.; Ahmad, I.; Borasi, F.; Caggiano, J.; Davids, C. et al. December 13, 1999.

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Description

Understanding the fate of heavy-metal contaminants in the environment is of fundamental importance in the development and evaluation of effective remediation and sequestration strategies. Among the factors influencing the transport of these contaminants are their chemical speciation and the chemical and physical attributes of the surrounding medium. Bacteria and the extracellular material associated with them are thought to play a key role in determining a contaminant's speciation and thus its mobility in the environment. In addition, the microenvironment at and adjacent to actively metabolizing cell surfaces can be significantly different from the bulk environment. Thus, the spatial distribution and chemical speciation of contaminants and elements that are key to biological processes must be characterized at micron and submicron resolution in order to understand the microscopic physical, geological, chemical, and biological interfaces that determine a contaminant's macroscopic fate. Hard x-ray microimaging is a powerful technique for the element-specific investigation of complex environmental samples at the needed micron and submicron resolution. An important advantage of this technique results from the large penetration depth of hard X-rays in water. This advantage minimizes the requirements for sample preparation and allows the detailed study of hydrated samples. This paper presents results of studies of the spatial distribution of naturally occurring metals and a heavy-metal contaminant (Cr) in and near hydrated bacteria (Pseudomonas fluorescens) in the early stages of biofilm development performed at the Advanced Photon Source Sector 2 X-ray microscopy beamline.

Physical Description

14 p.

Notes

INIS; OSTI as DE00750459

Medium: P; Size: 14 pages

Source

  • 8th International Conference on Accelerator Mass Spectrometry, Vienna (AT), 09/06/1999--09/10/1999

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  • Report No.: ANL/PHY/CP-99022
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750459
  • Archival Resource Key: ark:/67531/metadc703569

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 13, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 2:04 p.m.

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Paul, M.; Berkovits, D.; Ahmad, I.; Borasi, F.; Caggiano, J.; Davids, C. et al. AMS of heavy elements with an ECR ion source and the ATLAS linear accelerator., article, December 13, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc703569/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.