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Accumulation of

Shenghong Rao1, Jun Liang2, Wencheng Song3

  • 1School of Nursing, Anhui Sanlian University, Hefei, 230601, PR China.

Journal of Environmental Radioactivity
|September 16, 2018
PubMed

Insights

Filamentous fungi isolated from contaminated soils efficiently accumulate Europium-152/154 (Eu(III)). These radionuclide-resistant fungi show high tolerance and potential for environmental remediation of radioactive contaminants.

Area of Science:

  • Environmental Microbiology
  • Radiochemistry
  • Mycology

Background:

  • Radionuclide contamination poses significant environmental risks.
  • Filamentous fungi exhibit resistance to heavy metals and radionuclides.
  • Understanding fungal-radionuclide interactions is crucial for remediation strategies.

Purpose of the Study:

  • To investigate the accumulation of Europium-152/154 (Eu(III)) by two species of filamentous fungi.
  • To determine the optimal conditions for Eu(III) biosorption.
  • To characterize fungal responses to Eu(III) stress.

Main Methods:

  • Isolation of radionuclide-resistant fungi from contaminated soils.
  • Batch experiments to study Eu(III) accumulation kinetics and influencing factors (contact time, pH, ionic strength, thiol compounds).
  • Fourier-transform infrared spectroscopy (FT-IR), acid-base titrations, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) for characterization.

Main Results:

  • Aspergillus sydowii and Trichoderma harzianum demonstrated high Eu(III) tolerance (up to 3000 mg/L and 3500 mg/L, respectively).
  • Eu(III) accumulation followed a pseudo-second-order kinetic model for both fungal species.
  • Significant changes in fungal morphology were observed under Eu(III) stress.

Conclusions:

  • Filamentous fungi, specifically A. sydowii and T. harzianum, are effective in accumulating Eu(III).
  • These fungi possess high tolerance to Eu(III), indicating potential for bioremediation of radionuclide-contaminated environments.
  • Fungal accumulation and transformation processes are key factors in radionuclide environmental migration.
Keywords:
(152+154)Eu(III)A. sydowiiAccumulationT. harzianumTolerance

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