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Lead immobilization and bioavailability in microbial and root interface.

Jin Hee Park1, Nanthi Bolan

  • 1Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA 5095, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment, Adelaide, SA 5095, Australia; Centre for Mined Land Rehabilitation, The University of Queensland, St. Lucia, QLD 4113, Australia.

Journal of Hazardous Materials
|March 16, 2013
PubMed
Summary
This summary is machine-generated.

Phosphate solubilizing bacteria (PSB) enhance phosphate rock (PR) to immobilize lead (Pb). This method reduces lead uptake in plants like Indian mustard and ryegrass, offering an eco-friendly alternative to soluble phosphates.

Keywords:
BioavailabilityECICP-OESMicroboxNBRIPNational Research Institute's phosphatePPRPSBPb immobilizationPhosphate rockPhosphate solubilizing bacteriaTSYWHCelectrical conductivityinductively coupled plasma optical emission spectroscopyphosphatephosphate rockphosphate solubilizing bacteriatrypticase soy yeastwater holding capacity

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Area of Science:

  • Environmental Science
  • Microbiology
  • Soil Science

Background:

  • Phosphate compounds are used to immobilize lead (Pb) in soil and solution.
  • Limitations of current methods include low solubility and phosphorus (P) leaching.
  • Phosphate solubilizing bacteria (PSB) can enhance the solubility of insoluble P compounds.

Purpose of the Study:

  • To investigate the effects of PSB on lead immobilization.
  • To assess the reduction in lead uptake by plants in the presence of phosphate rock (PR) and PSB.
  • To compare PSB efficacy with traditional soluble phosphate compounds.

Main Methods:

  • Tested PSB with PR for lead immobilization in nutrient agar and soil.
  • Evaluated lead uptake in Indian mustard (Brassica juncea) and ryegrass (Lolium perenne).
  • Confirmed PSB root colonization via halo formation in tricalcium phosphate medium.

Main Results:

  • PSB and PR addition effectively immobilized lead in both agar and soil.
  • Lead translocation from root to shoot was significantly reduced.
  • Shoot lead concentrations decreased by 58.1% in Indian mustard and 22.8% in ryegrass.

Conclusions:

  • PSB facilitate lead immobilization using phosphate rock, reducing plant lead uptake.
  • This approach offers an environmentally sound alternative to soluble phosphates, mitigating eutrophication risks.
  • PSB are a promising co-amendment for sustainable lead remediation in contaminated soils.