Environmental monitoring of the role of phosphate compounds in enhancing immobilization and reducing bioavailability of lead in contaminated soils

Park, Jin Hee, Bolan, Nanthi S., Chung, Jae Woo, Naidu, Ravi and Megharaj, Mallavarapu (2011) Environmental monitoring of the role of phosphate compounds in enhancing immobilization and reducing bioavailability of lead in contaminated soils. Journal of Environmental Monitoring, 13 8: 2234-2242. doi:10.1039/c1em10275c


Author Park, Jin Hee
Bolan, Nanthi S.
Chung, Jae Woo
Naidu, Ravi
Megharaj, Mallavarapu
Title Environmental monitoring of the role of phosphate compounds in enhancing immobilization and reducing bioavailability of lead in contaminated soils
Journal name Journal of Environmental Monitoring   Check publisher's open access policy
ISSN 1464-0325
1464-0333
Publication date 2011-08
Sub-type Article (original research)
DOI 10.1039/c1em10275c
Open Access Status Not Open Access
Volume 13
Issue 8
Start page 2234
End page 2242
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2012
Language eng
Abstract Lead is a highly toxic element and forms stable compounds with phosphate, which is commonly used to immobilize Pb in soils. However, few studies have monitored the long-term stability of immobilized Pb, which is a critical factor in determining the effectiveness of the in situ stabilization technique. Both soluble and insoluble phosphate compounds were tested for Pb immobilization, and its subsequent mobility and bioavailability in a contaminated soil from a shooting range. Adding tricalcium phosphate, hydroxyapatite, rock phosphate and potassium dihydrogen phosphate reduced the concentration of ammonium-nitrate-extractable Pb in the contaminated soil by 78.6%, 48.3%, 40.5% and 80.1%, respectively. Insoluble phosphate amendments significantly reduced leached Pb concentration from the column while soluble potassium dihydrogen phosphate compound increased P and Pb concentrations in the leachate. Rock phosphate reduced Pb accumulation in earthworms by 21.9% compared to earthworms in the control treatment. The long-term stability of immobilized Pb was evaluated after 2 years' incubation of the contaminated soil with rock phosphate or soluble phosphate compounds. Bioavailable Pb concentration as measured by simple bioavailability extraction test (SBET) showed the long-term stability of immobilized Pb by P amendments. Therefore, Pb immobilization using phosphate compounds is an effective remediation technique for Pb-contaminated soils.
Keyword In-situ stabilization
Eisenia-foetida
Range soils
Pb
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2012 Collection
 
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