Redução de cromo hexavalente por bactérias isoladas de solos contaminados com cromo

Conceição, Daniele Priscila da; Jacques, Rodrigo Josemar Seminoti; Bento, Fátima Menezes; Simonetti, Amauri Braga; Selbach, Pedro Alberto; Camargo, Flávio Anastácio de Oliveira

doi:10.1590/s0103-84782007000600024

Cited by 13 publications

(6 citation statements)

References 12 publications

(5 reference statements)

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“…According to Conceição et al (2007) and Somenahally et al (2013), microorganisms have the ability to adapt to various environmental changes, as long as they are able to maintain the intracellular pH around 7.5, a process that is achieved by the extrusion or intrusion of H + ions by the microbial cell. A trend curve following the equation y = − 0.08235 x + 8.4706 and R 2 = 0.93658 was established to validate pH values obtained in the experiment and it allowed to estimate that the concentration of Cr(VI) would reach zero after 102 h. However, degradation of metal in culture of Vagococcus sp.…”

Section: Resultsmentioning

confidence: 99%

Potential of Bacterial Isolates from a Stream in Manaus-Amazon to Bioremediate Chromium-Contaminated Environments

Teles

Castro

Sargentini

et al. 2018

Water Air Soil Pollut

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Igarapé do Quarenta (IgQ), a stream located in the Manaus-AM, BR, has directly experienced the impacts of urban expansion over the last five decades, which contributed for its contamination. As an affluent of Rio Negro, IgQ also affects the water quality of this important river that bathes Manaus. However, the stress caused by the prolonged exposition to chemical agents may have selected microorganisms that exhibit great bioremediation potential. In the present study, bacteria isolated from four distinct sites of the IgQ were identified, and their potential to degrade hexavalent chromium (Cr(VI)) was investigated using the s-diphenylcarbazide method. Among the investigated isolates, 14 exhibited resistance against Cr(VI) at a concentration of 300 mg/L and eight isolates reduced over 50% (53.5–97.4%) chromium ratios after 72 h of incubation. Those isolates were identified by gene sequencing and classified in 10 genera (Acidovorax sp., Acinetobacter sp., Alicycliphilus sp., Bacillus sp., Comamonas sp., Enterobacter sp., Micrococcus sp., Proteus sp., Serratia sp., and Vagococcus sp.). Under control conditions, the isolate of Vagococcus sp. genus, in only 24 h of incubation, reduced 96.8% of the rate of Cr(VI) added to the culture medium at the concentration of 10 mg/L. Obtained results indicate that the Vagococcus sp. exhibits a great potential to be used in the bioremediation of areas contaminated with chromium. The mechanisms of action of microorganisms should be investigated for more specific applications in the decontamination of effluents and direct use of its by-products to bioremediate polluted environments.Electronic supplementary materialThe online version of this article (10.1007/s11270-018-3903-1) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Potential of Bacterial Isolates from a Stream in Manaus-Amazon to Bioremediate Chromium-Contaminated Environments

Teles

Castro

Sargentini

et al. 2018

Water Air Soil Pollut

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“…Em isolamentos bacterianos feitos por Conceição et al (2007), a partir de solos com histórico de contaminação anterior por cromo, foram observados uma grande quantidade de linhagens com capacidade de resistência e de redução do Cr(VI). Também, foi verificada que esta atividade foi levemente inibida pela presença da maioria dos íons; porém, quando o Mg e Mn a inibição foi ainda maior.…”

Section: Figura 2 -Comparação Das Dos Em Meiounclassified

Avaliação Da Cinética De Comportamento E Capacidade De Redução De Cromo Por Linhagens Bacterianas Padrão

Bizani

Spagiari

2016

CeN

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With the growing world development there is a big waste generation by agricultural systems, industrial and besides several accidents with different pollutants, such as petrochemical, metal mechanic, leather and footwear, mining, etc, raising concern with the environment environment and more knowledge about their degradation. In this sense, alternatives are sought to try to minimize environmental problems using living organisms and their enzymes in the biodegradation of toxic compounds aimed at its eradication, reduction or transformation into less toxic substances. To evaluate the growth kinetics, survivability and bioreduction, this study used standard bacterial strains of Acetobacter aceti and Micrococcus luteus in medium containing chromium ion (VI). The chromium ion-containing media were made up by dissolving 850 mg of K2Cr2O7, 1 liter adjusted to the desired concentration of 300 mg L-1. The bioprocess was conducted and 250 ml flask type incubator shaker at 32° C for 7 days. Quantification followed the methodology established by Standard Methods (Method 3500 Cr B). Both strains were shown to be capable of reducing the chromium ion concentrations, containing more than 36% rate. The behavior of strains in liquid medium presented constantly growing and showing no interference of chromium ion.

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“…In the studies mentioned in what follows, there are a larger number of citations on the use of bacteria (Conceição et al 2007;Panigatti et al 2012; (Saravanan et al 2009) for the conversion of metals and fewer studies on the use of microalgae. Gagrai, Das and Golder (2013) performed the study of passive biosorption of Cr VI and its conversion to Cr III by non-living biomass of Spirulina, founding that the optimal conditions were in pH 0.5 in initial Cr (VI) concentrations of 0.96 mM.…”

Section: Cr VI Removal and Bioconversion In Cr Iii By Live Biomassmentioning

confidence: 99%

Potential of LiveSpirulina platensison Biosorption of Hexavalent Chromium and Its Conversion to Trivalent Chromium

Colla

Dal'Magro

Rossi

et al. 2014

International Journal of Phytoremediation

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Microalga biomass has been described worldwide according their capacity to realize biosorption of toxic metals. Chromium is one of the most toxic metals that could contaminate superficial and underground water. Considering the importance of Spirulina biomass in production of supplements for humans and for animal feed we assessed the biosorption of hexavalent chromium by living Spirulina platensis and its capacity to convert hexavalent chromium to trivalent chromium, less toxic, through its metabolism during growth. The active biomass was grown in Zarrouk medium diluted to 50% with distilled water, keeping the experiments under controlled conditions of aeration, temperature of 30°C and lighting of 1,800 lux. Hexavalent chromium was added using a potassium dichromate solution in fed-batch mode with the aim of evaluate the effect of several additions contaminant in the kinetic parameters of the culture. Cell growth was affected by the presence of chromium added at the beginning of cultures, and the best growth rates were obtained at lower metal concentrations in the medium. The biomass removed until 65.2% of hexavalent chromium added to the media, being 90.4% converted into trivalent chromium in the media and 9.6% retained in the biomass as trivalent chromium (0.931 mg.g(-1)).

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Redução de cromo hexavalente por bactérias isoladas de solos contaminados com cromo

Cited by 13 publications

References 12 publications

Potential of Bacterial Isolates from a Stream in Manaus-Amazon to Bioremediate Chromium-Contaminated Environments

Potential of Bacterial Isolates from a Stream in Manaus-Amazon to Bioremediate Chromium-Contaminated Environments

Avaliação Da Cinética De Comportamento E Capacidade De Redução De Cromo Por Linhagens Bacterianas Padrão

Potential of LiveSpirulina platensison Biosorption of Hexavalent Chromium and Its Conversion to Trivalent Chromium

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