Microbial solubilization and immobilization of toxic metals: key biogeochemical processes for treatment of contamination

White, C.; Sayer, Jacqueline A.; Gadd, Geoffrey M.

doi:10.1111/j.1574-6976.1997.tb00333.x

Cited by 297 publications

(100 citation statements)

References 90 publications

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“…The use of citrate as the chelator may be particularly interesting, since citrate, on the one hand, is produced in situ by specific microorganisms (e.g. White et al 1997) while, on the other hand, some microorganisms are capable of accumulating heavy metals complexed to citrate (Madsen and Alexander 1985). Combination of the two processes would result in a complete cycle of bioremediation in which the toxic metal, in the first step, is mobilized from the contaminated site by binding to citrate, and, in the second step, is recovered from the leachate by bioaccumulation.…”

Section: Discussionmentioning

confidence: 99%

“…Bacteria capable of taking up and metabolizing heavy metal ions complexed to citrate have been implicated in preventing the mobilization of toxic metals from waste dumps (Joshi-Tope and Francis 1995). Alternatively, these organisms may play a role in bioremediation of heavy-metal-polluted sites by active accumulation of the toxic ions after heterotrophic leaching with citrate (White et al 1997;Peters 1999).…”

Section: Introductionmentioning

confidence: 99%

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Impact of the Mg 2+ -citrate transporter CitM on heavy metal toxicity in Bacillus subtilis

Krom

Huttinga

Warner

et al. 2002

Archives of Microbiology

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Bacillus subtilis possesses a secondary transporter, CitM, that is specific for the complex of citrate and Mg 2+ but is also capable of transporting citrate in complex with the heavy metal ions Zn 2+ , Ni 2+ and Co 2+ . We report on the impact of CitM activity on the toxicity of Zn 2+ , Ni 2+ and Co 2+ in B. subtilis. In a citM deletion mutant or under conditions in which CitM is not expressed, the toxic effects of the metals were reduced by the presence of citrate in the medium. In contrast, the presence of citrate dramatically enhanced toxicity when the Mg 2+ -citrate transporter was present in the membrane. It is demonstrated that the complex of Ni 2+ and citrate is transported into the cell and that the uptake is responsible for the enhanced toxicity. At toxic concentrations of the metal ions, the cultures adapted by developing tolerance against these ions. Tolerant cells isolated by exposure to one of the metal ions remained tolerant after growth in the absence of toxic metal ions and were cross-tolerant against the other two toxic ions. Tolerant strains were shown to contain point mutations in the citM gene, which resulted in premature termination of translation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of the Mg 2+ -citrate transporter CitM on heavy metal toxicity in Bacillus subtilis

Krom

Huttinga

Warner

et al. 2002

Archives of Microbiology

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“…siderophores). The bioavailability of PTMs may be facilitated by soil microorganisms producing polycarboxylic organic acids and other chelating metabolites (White et al 1997). PTMs can also be complexed and mobilized by small molecules of fulvic and humic acids comprising dissolved soil organic matter (Jordan et al 1997).…”

Section: Relationships Among Soil Properties Ptms Fractionation Biomentioning

confidence: 99%

Relationship of soil properties to fractionation, bioavailability and mobility of lead and zinc in soil

Finzgar¹,

Tlustoš²,

Leštan³

2007

Plant Soil Environ.

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Sequential extractions, metal uptake by Taraxacum officinale, Ruby's physiologically based extraction test (PBET) and toxicity characteristic leaching procedure (TCLP), were used to assess the risk of Pb and Zn in contaminated soils, and to determine relationships among soil characteristics, heavy metals soil fractionation, bioavailability and leachability. Regression analysis using linear and 2 nd order polynomial models indicated relationships between Pb and Zn contamination and soil properties, although of small significance (P < 0.05). Statistically highly significant correlations (P < 0.001) were obtained using multiple regression analysis. A correlation between soil cation exchange capacity (CEC) and soil organic matter and clay content was expected. The proportion of Pb in the PBET intestinal phase correlated with total soil Pb and Pb bound to soil oxides and the organic matter fraction. The leachable Pb, extracted with TCLP, correlated with the Pb bound to carbonates and soil organic matter content (R 2 = 69%). No highly significant correlations (P < 0.001) for Zn with soil properties or Zn fractionation were obtained using multiple regression.

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“…Despite of this copper containing manures are still applied. Copper can interrupt the activity in soil, as it negatively influences the activity of micro-organism and earthworms (Alfrey, 1992;Szymanowski et al, 1990;Unz and Shuttleworth, 1996;White et al, 1997). The decomposition of organic matter may seriously slow down.…”

Section: Introductionmentioning

confidence: 99%

Economically Viable Fungal Production by Using Alternative Plant Material for the Removal of Heavy Metal

Jha¹,

Dikshit²

2015

J. of Environmental Science and Technology

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Environmental pollution affects the quality of atmosphere, lithosphere and biosphere. Efforts have been made in the last two decades to reduce the pollution sources and remedy the polluted water sources. Water quality monitoring in developing countries is inadequate especially in stream water affected by urban effluent and runoff. The purpose of this study was to investigate heavy metal contaminants in sank stream water in Gwalior. The water sample from stream and industrial effluents that drain into the stream were collected and analyzed for the total elemental concentration using atomic absorption spectrophotometer. The result showed that:-the wastewater was highly encircled with copper above the maximum permissible limit. 2) the level of dissolved oxygen was below the maximum permissible limit, while biological oxygen demand was above the maximum permissible limit. All industrial effluents/wastewater were classified as strong. Factors analysis results reveal two sources of pollutants; multiple origin of copper and mixed origin or chemical phenomena of industrial and vehicular emission.

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Microbial solubilization and immobilization of toxic metals: key biogeochemical processes for treatment of contamination

Cited by 297 publications

References 90 publications

Impact of the Mg 2+ -citrate transporter CitM on heavy metal toxicity in Bacillus subtilis

Impact of the Mg 2+ -citrate transporter CitM on heavy metal toxicity in Bacillus subtilis

Relationship of soil properties to fractionation, bioavailability and mobility of lead and zinc in soil

Economically Viable Fungal Production by Using Alternative Plant Material for the Removal of Heavy Metal

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