Sorption isotherm-sequential extraction analysis of heavy metal retention in landfill liners

The chemical partitioning of heavy metals in soil materials is of great importance in risk assessment, landfill bottom liner design, and remedial investigation. The sorption characteristics of clayey calcareous sediments used to construct landfill bottom liners at four sites in southeastern Michigan...

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Bibliographic Details
Published in:	Soil Science Society of America journal Vol. 60; no. 1; pp. 107 - 114
Main Authors:	Salim, Imad A., Miller, Carol J., Howard, Jeffrey L.
Format:	Journal Article
Language:	English
Published:	Madison, WI Soil Science Society of America 01-01-1996 American Society of Agronomy
Subjects:	analytical methods arcilla argile cadmio cadmium Chemistry clay Earth sciences Earth, ocean, space eliminacion de desechos elimination des dechets Engineering and environment geology. Geothermics Exact sciences and technology Hazardous materials Heavy metals Isotherms land Landfill Landfills lead metal lourd metales pesados Metals nickel niquel plomb plomo Pollution, environment geology Risk assessment Sediments Soils sorcion Sorption Surficial geology technique analytique tecnicas analiticas terre tierras waste disposal Waste disposal sites United States North America Michigan nickel upper Pleistocene lake sediments Quaternary heavy metals cadmium partitioning pollution soils sorption lead
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Summary:	The chemical partitioning of heavy metals in soil materials is of great importance in risk assessment, landfill bottom liner design, and remedial investigation. The sorption characteristics of clayey calcareous sediments used to construct landfill bottom liners at four sites in southeastern Michigan were studied using a new method: combined sequential extraction-sorption isotherm analysis (CSSA). After spiking to simulate high levels of contamination, the sediments sorbed large quantities of Pb (approximately 1480-145 000 mg kg-1), Ni (approximately 750-8100 mg kg-1), and Cd (approximately 980-5070 mg kg-1). Sequential extraction data indicated that Pb and Ni were principally in a carbonate-occluded form, whereas Cd was mainly in an exchangeable form at high levels (>1000 mg kg-1) of contamination. These results suggest that Pb and Ni will be immobilized by the liner materials but Cd will probably be highly mobile. By applying sequential extraction analysis after spiking, Langmuir sorption isotherms were constructed successfully for most of the individually targeted phases.
Bibliography:	T T01 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0361-5995 1435-0661
DOI:	10.2136/sssaj1996.03615995006000010018x