| Total metal concentration is not enough to assess the environmental impact of polluted soils. This study will evaluate and characterize soil properties to assess the appropriateness of the soil before amendments are to be applied, and assess the potential risk of metal mobilization. Solubility and content of Cr, Cu, Pb, Zn, and Cd in various physical and chemical fractions were measured. Water dispersible colloids (WDC) were also quantified and characterized. Five soils were used: two agronomic soils which received a heavy dose of sewage sludge, a farm soil used for injection of tuna waste, a scrap metal site, and an abandoned garbage dump. WDC contents were higher in sludge-amended soils compared to the control plots. Content of metals were higher in the WDC. Cr and Cu were found primarily in the oxide and organic, Pb in the organic, Zn in the oxide, and Cd in the carbonate fractions. |
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