Cr(VI) reduction into Cr(III) as a mechanism to explain the low sensitivity of Vibrio fischeri bioassay to detect chromium pollution.
Vibrio fischeri bacteria, used as a biological target in either acute or chronic toxicity tests, display a low sensitivity to Cr(VI). This phenomenon could be due to the capacity of these bacteria to reduce Cr(VI) into Cr(III). This reducing capacity was found to depend on culture medium composition, pH value, incubation time and the presence of a carbon source. It also depends on the nature of the carbon source, glucose being more efficient than glycerol. This is probably related to differences in bacterial metabolism when given either glucose or glycerol. The thermostable Cr(VI)-reducing activity found in the supernatants of V. fischeri cultures grown on glucose suggests that, under these conditions, the bacteria release non-proteic reducing substances which have not been identified yet.
Fulladosa
Elena
E
Chemical Engineering Department, Universitat de Girona, Avda. Lluís Santaló, s/n. 17071 Girona, Spain. elena.fulladosa@udg.es
Desjardin
Valérie
V
Murat
Jean-Claude
JC
Gourdon
Rémy
R
Villaescusa
Isabel
I
D048908:Aliivibrio fischeri / Q000254:growth & development* / Q000378:metabolism; D001681:Biological Assay / Q000379:methods*; D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis*; D010084:Oxidation-Reduction
D004785:Environmental Pollutants; D002857:Chromium; D003300:Copper