Chromium(VI) toxicity to luminescent bacteria

Chromium(VI) toxicity to luminescent bacteria

The toxicity of chromium(VI) to luminescent bacteria was determined using the Microtox® bioassay. The aim of this study was to assess the influence of pH on the toxicity of Cr(VI) samples because its speciation depends on this parameter. A Microtox test basic protocol, modified to assure the same pH...

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Bibliographic Details
Published in:Environmental toxicology and chemistry Vol. 16; no. 5; pp. 871 - 874
Main Authors: Villaescusa, Isabel, Marti, Salvi, Matas, Carme, Martine, Maria, Ribó, Josep M.
Format: Journal Article
Language:English
Published: Hoboken Wiley Periodicals, Inc 01-05-1997
SETAC
Subjects:
Action of physical and chemical agents on bacteria
Bacteriology
Biological and medical sciences
Chemical and industrial products toxicology. Toxic occupational diseases
Chromium(VI)
Exposure-time effect
Fundamental and applied biological sciences. Psychology
Medical sciences
Metals and various inorganic compounds
Microbiology
Microtox
pH effect
Photobacterium phosphoreum
Toxicity
Toxicology
Photobacterium phosphoreum
Bioluminescence
Bioassay
Toxicity
pH
Bacteria
Vibrionaceae
Environmental factor
Exposure time
Chromium VI
Heavy metal
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Summary:The toxicity of chromium(VI) to luminescent bacteria was determined using the Microtox® bioassay. The aim of this study was to assess the influence of pH on the toxicity of Cr(VI) samples because its speciation depends on this parameter. A Microtox test basic protocol, modified to assure the same pH in all the cuvettes, was used to determine the toxicity of the Cr(VI) compounds. In the range studied, 4.6 to 9.3, the observed EC50 values increased with the pH (31–1,184 mg/L Cr(VI)). These toxicity results were related to the percentage of the different Cr(VI) species. Hydrogenchromate anion was found to be the most toxic species. In general, only slight differences in toxicity were found when the Microtox test basic protocol was used. Nevertheless, when 20.4% (w/v) sucrose was used as an alternative medium to 2% (w/v) NaCl, the results obtained could not be compared because the sensitivity of the bacteria in this medium was found to be different. The influence of an exposure‐time effect was also evaluated. In 2% (w/v) NaCl medium, the toxicity increased with time, which indicates a slow response of the bacteria to the toxin.
Bibliography:istex:5550E01F7DB3D7C6BBDFA0584CA4D95811760D01
ark:/67375/WNG-53VGFK2P-X
ArticleID:ETC5620160506
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0730-7268
1552-8618
DOI:10.1002/etc.5620160506