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Distinct and relevant infrared absorption bands related to the transformation are used not only as chemical markers to detect different chromium species, but also as biological markers to detect the presence and activity of microorganisms on specimen surfaces. The researchers conducted FTIR experiments to distinguish the relative significance of these two mechanisms. In addition, they evaluated the effects of common organic co-contaminants, such as toluene vapor, on the biotic reduction process. With FTIR spectromicroscopy, the researchers showed that the changes in the infrared absorption bands occurred at the sites of bacterial concentration. The allocation process for physical sciences independent-investigator beamtime for the running period between October 1999 and May 2000 is complete.