Lead immobilization and bioavailability in microbial and root interface

Park, Jin Hee and Bolan, Nanthi (2013) Lead immobilization and bioavailability in microbial and root interface. Journal of Hazardous Materials, 261 777-783. doi:10.1016/j.jhazmat.2013.02.010

Author Park, Jin Hee
Bolan, Nanthi
Title Lead immobilization and bioavailability in microbial and root interface
Journal name Journal of Hazardous Materials   Check publisher's open access policy
ISSN 0304-3894
Publication date 2013-02-16
Sub-type Article (original research)
DOI 10.1016/j.jhazmat.2013.02.010
Volume 261
Start page 777
End page 783
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
A range of both soluble and insoluble phosphate (P) compounds have been used to immobilize Pb in solution and soil. However, these compounds have limitations because of low solubility or leaching of P. Phosphate solubilizing bacteria (PSB) can be used to enhance the solubility of insoluble P compounds. The effects of PSB on the immobilization of Pb in the presence of phosphate rock (PR) and subsequent reduction in Pb uptake by Indian mustard (Brassica juncea) in nutrient agar medium and ryegrass (Lolium perenne) in soil under sterile condition were tested. Root colonization of PSB was confirmed by halo formation around the root in the medium containing tricalcium phosphate. Addition of PR in the presence of PSB immobilized Pb in both agar medium and soil, and reduced Pb translocation from root to shoot. Furthermore, shoot Pb concentrations of Indian mustard in agar medium and ryegrass in soil were decreased by 58.1% and 22.8%, respectively, compared to the control. Even though soluble P compound was the most effective in the immobilization of Pb, excess P may cause eutrophication. Therefore, PSB are suggested as a co-amendment to facilitate immobilization of Pb without causing any detrimental effect on the environment.

Highlights ► Phosphate solubilizing bacteria successfully colonized plant roots. ► Phosphate solubilizing bacteria increased water soluble P concentration in soil. ► Phosphate solubilizing bacteria and phosphate rock immobilized Pb. ► Phosphate solubilizing bacteria with phosphate rock reduced Pb uptake by plants. ► Phosphate solubilizing bacteria slowly released P to immobilize Pb without causing P leaching.
Keyword Phosphate solubilizing bacteria
Pb immobilization
Phosphate rock
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 16 February 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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Created: Wed, 11 Sep 2013, 01:53:00 EST by Jin Hee Park on behalf of Centre For Mined Land Rehabilitation