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ADSORPTION OF CADMIUM ONTO ORGANIC, TOTAL INORGANIC, AND METAL OXIDE FRACTIONS IN BIOSOLIDS AND BIOSOLID-AMENDED SOILS
Citation:
Hettiarachchi**, G. M., J A. Ryan*, AND Z. Li**. ADSORPTION OF CADMIUM ONTO ORGANIC, TOTAL INORGANIC, AND METAL OXIDE FRACTIONS IN BIOSOLIDS AND BIOSOLID-AMENDED SOILS. Presented at Sixth International Conference on Biogeochemistry of Trace Elements, University of Guelph, Ontario Canada, 7/29-8/2/2001.
Description:
The environmental impact and potential hazards of metals in biosolids to plants, animals and the human food chain from biosolids application on soils has been studied for decades. The early hypothesis known as "Time Bomb" has been questioned by recent research results which tend to support a new hypothesized mechanism. That biosolids application alters the soil properties and this alternation of soil properties is permanent. The inorganic phases of biosolids controls the metal availability in soil and water systems such that the metals in biosolids will not release into soil solution. If these hypotheses are correct, soils with biosolids amendments should possess a relatively greater adsorption capability, and the inorganic phases added via the biosolids would be responsible for a significant increase in the increased adsorption. The purpose of this study was to investigate the adsorption of Cd on different inorganic fractions of biosolids, soils with or without biosolid amendments.