Abstract

CONCEICAO, Daniele et al. Reduction of hexavlent chromium by isolated bacteria of contaminated soils with chromium. Cienc. Rural [online]. 2007, vol.37, n.6, pp. 1661-1667. ISSN 0103-8478.  http://dx.doi.org/10.1590/S0103-84782007000600024.

The reduction of Cr(VI) to Cr(III) decrease the toxic effect of this metal in the environment, because Cr(III) is insoluble to the biological membranes. The microbial reduction of Cr(VI) it is an alternative to reduce the environmental impacts caused by this metal used in several industrial processes. The objective of this research was to select microorganisms from chromium contaminated soil and to characterize their ability to reduce Cr(VI). The activity of reduction of Cr(VI) for the isolated was quantified with s-diphenylcarbazide. A group of 20 chromium resistant bacteria were isolated; six of these were able to reduce 100mg L^-1 Cr(VI) in 24 hours. The isolated bacteria, from contaminated soil can remediate chromate and presented potential for other studies seeking their application in bioremediation processes.

Keywords : bioremediation; hexavalente chromium; chromium-resistant bacteria.