Comparative value of phosphate sources on the immobilization of lead, and leaching of lead and phosphorus in lead contaminated soils

Park, Jin Hee, Bolan, Nanthi, Megharaj, Mallavarapu and Naidu, Ravi (2011) Comparative value of phosphate sources on the immobilization of lead, and leaching of lead and phosphorus in lead contaminated soils. Science of the Total Environment, 409 4: 853-860. doi:10.1016/j.scitotenv.2010.11.003


Author Park, Jin Hee
Bolan, Nanthi
Megharaj, Mallavarapu
Naidu, Ravi
Title Comparative value of phosphate sources on the immobilization of lead, and leaching of lead and phosphorus in lead contaminated soils
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 0048-9697
1879-1026
Publication date 2011-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2010.11.003
Volume 409
Issue 4
Start page 853
End page 860
Total pages 8
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Formatted abstract
and insoluble phosphate (P) compounds. The effectiveness of insoluble P sources on Pb immobilization
depends on their rate of dissolution which can be enhanced by phosphate solubilizing bacteria (PSB). In this
study, the effect of soluble (potassium dihydrogen phosphate) and insoluble (rock phosphate in the presence
and absence of PSB) P compounds on the immobilization of Pb, and leaching of Pb and P was examined using
both naturally contaminated (SR soil: NH4NO3 extractable Pb: 28.7 mg/kg, pH: 5.88, organic matter: 0.7%) and
Pb spiked (AH soil: NH4NO3 extractable Pb: 42.7 mg/kg, pH: 5.23, organic matter: 10.9%) soils. Phosphate
compounds were added at the rate of 200 mg P/kg and 800 mg P/kg for SR and AH soils, respectively. Soluble P
treatment immobilized 80% and 57% of Pb in SR and AH soils, respectively. Insoluble rock phosphate
immobilized 40% and 9% of Pb without PSB, and 60% and 17% with PSB in SR and AH soils, respectively. Lead
leaching was the lowest when soils were amended with rock phosphate in the presence of PSB, which reduced
Pb leaching by 36% for SR soil and 18% for AH soil compared to the control. The leaching of Pb increased when
the soils were amended with soluble P because soluble P treatment increased dissolved organic carbon (DOC)
concentration of soil, thereby increasing Pb mobility. Soluble P treatment significantly increased P leaching
and 9% of total added P was leached from low P retaining AH soil. The optimum level of P amendment is a
critical issue when soluble P is used as a Pb immobilizing agent because of eutrophication resulting from
excessive P leaching to surface and ground water. While the soluble P compound was effective in the
immobilization of Pb, it resulted in P leaching which increased with increasing levels of P addition. However,
rock phosphate amendment with PSB achieved the immobilization of Pb with a minimum effect on both Pb
and P leaching
Keyword Phosphate solubilizing bacteria
Pb immobilization
Leaching
Soluble P
Rock phosphate
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Available online 4 December 2010

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Mined Land Rehabilitation Publications
 
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Created: Tue, 17 Sep 2013, 21:53:31 EST by Jin Hee Park on behalf of Centre For Mined Land Rehabilitation