Evaluating the applicability of regulatory leaching tests for assessing the hazards of Pb-contaminated soils

Soil contamination is a major environmental problem due to the ecological threat it poses. In this work, electron probe microanalysis (EPMA), X-ray diffraction (XRD), and leaching studies were employed to explain the different leaching behaviors of non-stabilized and stabilized soils. The applicabil...

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Bibliographic Details
Published in:Journal of hazardous materials 2005-04, Vol.120 (1), p.101-111
Main Authors: Halim, Cheryl E., Scott, Jason A., Amal, Rose, Short, Stephen A., Beydoun, Donia, Low, Gary, Cattle, Julie
Format: Article
Language:English
Subjects:
Applied sciences
Cement
Chemical engineering
Crystallization, leaching, miscellaneous separations
Decontamination. Miscellaneous
Environmental Pollution - prevention & control
Exact sciences and technology
General treatment and storage processes
Hazardous Waste
Leachate
Lead
Lead - analysis
Lead - chemistry
Phosphate
Pollution
Refuse Disposal
Risk Assessment
Safety
Soil
Soil and sediments pollution
Soil Pollutants - analysis
Solubility
Toxicity characteristic leaching procedure (TCLP)
Wastes
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Summary:Soil contamination is a major environmental problem due to the ecological threat it poses. In this work, electron probe microanalysis (EPMA), X-ray diffraction (XRD), and leaching studies were employed to explain the different leaching behaviors of non-stabilized and stabilized soils. The applicability of the leaching fluids used in the toxicity characteristic leaching procedure (TCLP) and Australian Standards, AS 4439.1-1997 for assessing the hazards of contaminated soils was investigated as was the leaching of lead from soil stabilized by cement and buffered phosphate techniques. The results showed Pb speciation in the soil highly influenced metal leaching. The synthetic leaching fluids were unable to provide a reliable estimation of Pb concentration in the municipal landfill leachate (ML) due to the absence of organic ligands capable of forming stable complexes with the lead. Water provided the closest representation of lead leaching from the non-stabilized and phosphate stabilized soils while sodium tetraborate buffer was found to be suitable for cement-stabilized soil in a non-putrescible landfill leachate system. A comparison of stabilization methods revealed that the buffered phosphate technique was more suitable for stabilizing the lead in the soil relative to cement stabilization.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2004.12.039