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

The mobility and bioavailability of lead in soils can be mitigated by its immobilization using both soluble and insoluble phosphate compounds

Jin Hee Park; Nanthi Bolan; Mallavarapu Megharaj; Ravi Naidu

2010

Scholarcy highlights

  • The mobility and bioavailability of lead in soils can be mitigated by its immobilization using both soluble and insoluble phosphate compounds
  • The effectiveness of insoluble P sources on Pb immobilization depends on their rate of dissolution which can be enhanced by phosphate solubilizing bacteria
  • Phosphate compounds were added at the rate of 200 mg P/kg and 800 mg P/kg for 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
  • 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
  • ►Novel phosphate solubilizing bacteria enhanced P solubilization from rock phosphate and achieved Pb immobilization without any detrimental effect to the environment. ► soluble P compound was effective in the immobilization of Pb, it resulted in increased P and Pb leaching due to the formation of mobile dissolved organic carbon and Pb complex. ►Application of phosphate solubilizing bacteria with locally available low-cost insoluble phosphate compounds can be used as a sustainable remediation technology for in situ stabilization of Pb in contaminated sites including mine sites and urban soils

Need more features? Save interactive summary cards to your Scholarcy Library.