Chemical speciation of lead contaminated soils before and after treated with phosphate rocks
- Univ. of Florida, Gainesville, FL (United States)
This summary describes experiments conducted to determine the effectiveness of phosphate rocks in reducing lead solubility and bioavailability in soils. Eight contaminated soils were treated with three phosphate rocks and fractioned using sequential extraction methods. Reaction of the contaminated soils with phosphate rocks converted lead in water soluble, exchangeable, carbonate, and iron-manganese oxides to residual fractions, thus reducing lead solubility and bioavailability. The percent of lead present in residual fraction increased from a range of 8.2 to 13.2 to a range of 40.9 to 95.6 with the addition of 0.5 g of phosphate rocks. The increase increase in residual fractions correlates inversely with a decrease in water soluble lead concentrations. Precipitation of lead in these contaminated soils is the primary mechanism for reduced lead solubility. The successful conversion of lead from potentially available fractions to residual fraction suggests that phosphate rocks would be useful for in situ immobilization of lead in soils.
- OSTI ID:
- 210485
- Report Number(s):
- CONF-9509139-; TRN: 95:008324-0349
- Resource Relation:
- Conference: 7. ACS special symposium: emerging technologies in hazardous waste management, Atlanta, GA (United States), 17-20 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Emerging technologies in hazardous waste management VII; Tedder, D.W. [ed.]; PB: 1352 p.
- Country of Publication:
- United States
- Language:
- English
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