The amorphous iron oxide fraction in the colloid was found to have a high adsorption capacity for Cu, which may explain why Cu was predominantly present in this fraction. On the other hand, Cd was mainly associated with the crystalline iron oxide fraction, indicating that it had a stronger binding affinity for this type of iron oxide.
Iron oxides are known to play a crucial role in controlling the mobility and bioavailability of PTEs in soil environments. They can act as both sinks and sources for these contaminants, influencing their fate and transport in the soil system. The presence of different types of iron oxides with varying physicochemical properties can further complicate the behavior of PTEs in soils.
In conclusion, the results suggest that understanding the role of iron oxides in controlling PTE migration and transformation is essential for developing effective remediation strategies for contaminated soils.
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