Effect of complexing agents on reduction of Cr(VI) by Desulfovibrio vulgaris ATCC 29579.
The reduction of Cr(VI) at the expense of molecular hydrogen was studied using resting cells of Desulfovibrio vulgaris ATCC 29579 in anaerobic resting cell suspensions in MOPS buffer. Bioreduction occurred only in the presence of ligands or chelating agents (CO32-, citrate, NTA, EDTA, DTPA). The stimulatory effect of these ligands on the rate of Cr(VI) reduction was correlated (r = 0.988) with the strength of the ligand/chelate complex of Cr(III). The data are examined with respect to likely solution and redox equilibria in the ionic matrix of the carrier solution, and with respect to the potential for bioremediation of Cr(VI).
School of Biosciences, University of Birmingham, Edgbaston, UK.
Amanda N
AN
Mabbett
Jon R
JR
Lloyd
Lynne E
LE
Macaskie
D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D002614:Chelating Agents / Q000378:metabolism*; D002857:Chromium / Q000378:metabolism*; D016969:Desulfovibrio vulgaris / Q000378:metabolism*; D004579:Electron Transport; D008954:Models, Biological; D008956:Models, Chemical; D010084:Oxidation-Reduction; D012680:Sensitivity and Specificity
D002614:Chelating Agents; D002857:Chromium; C074702:chromium hexavalent ion