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Journal of Radioanalytical and Nuclear Chemistry

, Volume 270, Issue 3, pp 645–649 | Cite as

Diatom: A potential bio-accumulator of gold

  • N. Chakraborty
  • R. Pal
  • A. Ramaswami
  • D. Nayak
  • S. Lahiri
Article

Summary

The bioaccumulation of gold in trace concentration by Nitzschia obtusa and Navicula minima, two members of bacillariophyceae, has been studied. It has been observed that Nitzschia obtusa showed better accumulation of gold in acidic pH in comparison to neutral and basic pH. Maximum accumulation was observed with 1 mg . kg-1 or less   gold concentration. However, the accumulation by the living cells was reduced when the matrix concentration was higher. Navicula minima, on the other hand, found to be a better accumulator of gold in wide ranges of pH and substrate concentration of the media. It was also inferred that the gold accumulation by diatom was mainly due to adsorption by biosilica (siliceous frustules of dead diatom cells). Accumulated gold was recovered with conc. HNO3.

Keywords

Navicula Maximum Accumulation Gold Concentration Diatom Cell Algal Genus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2006

Authors and Affiliations

  • N. Chakraborty
    • 1
  • R. Pal
    • 2
  • A. Ramaswami
    • 3
  • D. Nayak
    • 4
  • S. Lahiri
    • 5
  1. 1.Department of Botany, University of Calcutta
  2. 2.Department of Botany, University of Calcutta
  3. 3.Radiochemistry Division, Bhabha Atomic Research Centre
  4. 4.Chemical Sciences Division, Saha Institute of Nuclear Physics
  5. 5.Chemical Sciences Division, Saha Institute of Nuclear Physics

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