The amorphous iron oxide fraction in colloid had a higher capacity for adsorbing Cu, while the crystalline iron oxide fraction was more effective in immobilizing Cd. This indicates that the type of iron oxide present in soil and colloid influences the mobility and availability of PTEs.
Moreover, the presence of organic matter in soil can also affect the behavior of PTEs. Organic matter can complex with PTEs, reducing their bioavailability and mobility. In addition, microorganisms in soil can transform PTEs into less toxic forms through various biogeochemical processes.
Overall, understanding the properties of soil components such as iron oxides and organic matter is crucial for predicting the fate and ecological risk of PTEs in soil.
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