Biosorption of lead phosphates by lead-tolerant bacteria as a mechanism for lead immobilization

  • Viridiana Rodríguez-Sánchez
  • Jesús Guzmán-Moreno
  • Vicente Rodríguez-González
  • Juan Armando Flores-de la Torre
  • Rosa María Ramírez-Santoyo
  • Luz Elena Vidales-Rodríguez
Original Paper

Abstract

The study of metal-tolerant bacteria is important for bioremediation of contaminated environments and development of green technologies for material synthesis due to their potential to transform toxic metal ions into less toxic compounds by mechanisms such as reduction, oxidation and/or sequestration. In this study, we report the isolation of seven lead-tolerant bacteria from a metal-contaminated site at Zacatecas, México. The bacteria were identified as members of the Staphylococcus and Bacillus genera by microscopic, biochemical and 16S rDNA analyses. Minimal inhibitory concentration of these isolates was established between 4.5 and 7.0 mM of Pb(NO3)2 in solid and 1.0–4.0 mM of Pb(NO3)2 in liquid media. A quantitative analysis of the lead associated to bacterial biomass in growing cultures, revealed that the percentage of lead associated to biomass was between 1 and 37% in the PbT isolates. A mechanism of complexation/biosorption of lead ions as inorganic phosphates (lead hydroxyapatite and pyromorphite) in bacterial biomass, was determined by Fourier transform infrared spectroscopy and X-ray diffraction analyses. Thus, the ability of the lead-tolerant isolates to transform lead ions into stable and highly insoluble lead minerals make them potentially useful for immobilization of lead in mining waste.

Keywords

Biosorption Hydroxyapatite Lead phosphates Lead tolerance Pyromorphite 

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Viridiana Rodríguez-Sánchez
    • 1
  • Jesús Guzmán-Moreno
    • 2
  • Vicente Rodríguez-González
    • 3
  • Juan Armando Flores-de la Torre
    • 4
  • Rosa María Ramírez-Santoyo
    • 1
  • Luz Elena Vidales-Rodríguez
    • 1
  1. 1.Unidad Académica de Ciencias BiológicasUniversidad Autónoma de Zacatecas “Francisco García Salinas”ZacatecasMexico
  2. 2.División de Biología MolecularInstituto Potosino de Investigación Científica y Tecnológica A. C.San LuisMexico
  3. 3.División de Materiales AvanzadosInstituto Potosino de Investigación Científica y Tecnológica A. C.San LuisMexico
  4. 4.Unidad Académica de Ciencias QuímicasUniversidad Autónoma de Zacatecas “Francisco García Salinas”ZacatecasMexico

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