Relative value of phosphate compounds in reducing the bioavailability and toxicity of lead in contaminated soils

Park, Jin Hee, Bolan, Nanthi, Megharaj, Mallavarapu and Naidu, Ravi (2012) Relative value of phosphate compounds in reducing the bioavailability and toxicity of lead in contaminated soils. Water Air and Soil Pollution, 223 2: 599-608. doi:10.1007/s11270-011-0885-7


Author Park, Jin Hee
Bolan, Nanthi
Megharaj, Mallavarapu
Naidu, Ravi
Title Relative value of phosphate compounds in reducing the bioavailability and toxicity of lead in contaminated soils
Journal name Water Air and Soil Pollution   Check publisher's open access policy
ISSN 0049-6979
1573-2932
Publication date 2012-02
Year available 2011
Sub-type Article (original research)
DOI 10.1007/s11270-011-0885-7
Volume 223
Issue 2
Start page 599
End page 608
Total pages 10
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2012
Language eng
Formatted abstract
Lead forms stable compounds with phosphate and the immobilized Pb becomes less available to soil biota. In this study, we tested the bioavailabilty of Pb using earthworms (Eisenia fetida) and plants after immobilization of Pb by a soluble P compound and an insoluble rock phosphate compound in the presence of phosphate-solubilizing bacteria (Enterobacter sp.). Rock phosphate in the presence of phosphate-solubilizing bacteria and a soluble P compound enhanced Pb immobilization as measured by NH4NO3-extractable Pb concentration, thereby reduced its bioavailability as evaluated by earthworm Pb loading and sunflower (Helianthus annuus) Pb uptake under greenhouse conditions. However, soluble P treatment increased the concentration of Pb in soil solution thereby inhibited the root elongation of mustard (Brassica hirta) seedlings. Sunflower plants in the Pb-spiked soil without P amendments showed symptoms of necrosis and stunting because of Pb toxicity. Both soluble and insoluble P treatments significantly increased shoot and root weight and decreased Pb concentration in shoot by more than 50% compared to the control. However, high Pb concentration in soil solution was found in soluble P treatment, which can be attributed to dissolved organic carbon–Pb complex formation, thereby increasing Pb mobility. The inoculation of phosphate-solubilizing bacteria can facilitate phytostabilization of Pb-contaminated site.
Keyword Bioavailability
Pb immobilization
Phosphate-solubilizing bacteria
Rock phosphate
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 15 July 2011

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