Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus

The microbial reduction of chromium(VI) to chromium(III) has been one of the most widely studied forms of metal bioremediation. Recently, we have found that Thiobacillus ferrooxidans and Thiobacillus thiooxidans, growing on elemental sulphur, can indirectly promote chromium(VI) reduction by producin...

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Detalles Bibliográficos
Autores principales: Donati, Edgardo Rubén, Oliver, C., Curutchet, G.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Química
bioremediation
Chromium(VI) reduction
Thiobacillus thioparus
Bacterias
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/62096
http://ref.scielo.org/66bxsy
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-62096
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
bioremediation
Chromium(VI) reduction
Thiobacillus thioparus
Bacterias
spellingShingle Química
bioremediation
Chromium(VI) reduction
Thiobacillus thioparus
Bacterias
Donati, Edgardo Rubén
Oliver, C.
Curutchet, G.
Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus
topic_facet Química
bioremediation
Chromium(VI) reduction
Thiobacillus thioparus
Bacterias
description The microbial reduction of chromium(VI) to chromium(III) has been one of the most widely studied forms of metal bioremediation. Recently, we have found that Thiobacillus ferrooxidans and Thiobacillus thiooxidans, growing on elemental sulphur, can indirectly promote chromium(VI) reduction by producing reducing agents such as sulphite and thiosulphate, which abiotically reduce chromium(VI). Those species of Thiobacillus are acidophilic bacteria which grow optimally at pH values lower than 4. However, most of those reducing agents are stabilised at higher pH values. Thus, the present paper reports on the ability to reduce chromium(VI) using another specie of Thiobacilli, Thiobacillus thioparus, which is able to grow at pH close to 7.0. T. thioparus cultures were carried out in a fermentation vessel containing medium and sulphur as the sole energy source and maintained at 30°C and 400 rpm. The pH was adjusted to 6.0, 7.0 or 8.0 and maintained with the automatic addition of KOH. Our results show high chromium (VI) reduction values (close to 100% at the end of bacterial growth) at the three pH values. The results of these experiments are very promising for development of a microbiological process to be used in the detoxification of chromium(VI)-polluted effluents.
format Articulo
Articulo
author Donati, Edgardo Rubén
Oliver, C.
Curutchet, G.
author_facet Donati, Edgardo Rubén
Oliver, C.
Curutchet, G.
author_sort Donati, Edgardo Rubén
title Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus
title_short Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus
title_full Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus
title_fullStr Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus
title_full_unstemmed Reduction of chromium (VI) by the indirect action of Thiobacillus thioparus
title_sort reduction of chromium (vi) by the indirect action of thiobacillus thioparus
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/62096
http://ref.scielo.org/66bxsy
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AT oliverc reductionofchromiumvibytheindirectactionofthiobacillusthioparus
AT curutchetg reductionofchromiumvibytheindirectactionofthiobacillusthioparus
bdutipo_str Repositorios
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