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Biological Trace Element Research

, Volume 12, Issue 1, pp 153–159 | Cite as

Survey of chemical speciation of trace elements using synchrotron radiation

  • Barry M. Gordon
Applications of Synchrotron Radiation

Abstract

Information concerning the chemical state of trace elements in biological systems generally has not been available. Such information for toxic elements and metals in metalloproteins could prove extremely valuable in the elucidation of their metabolism and other biological processes. The shielding of core electrons by binding electrons affect the energy required for creating inner-shell holes. Furthermore, the molecular binding and symmetry of the local environment of an atom affect the absorption spectrum in the neighborhood of the absorption edge. X-ray absorption near-edge structure (XANES) using synchrotron radiation excitation can be used to provide chemical speciation information for trace elements at concentrations as low as 10 ppm. The structure and position of the absorption curve in the region of an edge can yield vital data about the local structure and oxidation state of the trace element in question. Data are most easily interpreted by comparing the observed edge structure and position with those of model compounds of the element covering the entire range of possible oxidation states. Examples of such analyses will be reviewed.

Index Entries

Synchrotron radiation excitation chemical speciation of trace elements, survey of trace elements, chemical speciation of XANES trace elements, local structures of trace elements oxidative states of X-ray fluorescence EXAFS absorption edge spectroscopy bremsstrahlung continuum spectrum 

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Copyright information

© The Humana Press Inc 1987

Authors and Affiliations

  • Barry M. Gordon
    • 1
  1. 1.Department of Applied ScienceBrookhaven National LaboratoryUpton

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