Evaluation of nanoparticles movement in soil and their environmental impact

The entry of pollutants to surface and groundwater has been of recent public of environmental. The application of efficient solid materials and nanoparticles (NPs) as adsorbent has been investigated in recent years. Nanoparticles are remarkable due to their transport capacity in soil, effective surface area, high adsorption capacity, low solubility. NPs transported in the environment may have posed potential risks to organisms. Therefore, it is essential to understand the release of the NPs from soil column. In this study, the tested adsorbents were NPs (TiO۲, Al۲O۳ and Fe۳O۴) and modified NPs with chitosan applied at rate ۳% for soil amendment in leaching experiments. The soil columns were leached with ۲۵۰ mg P/L solution. The concentration of Al, Fe and Ti in the leached was measured. The amount of Ti and Fe leached in the control soil (۱.۸۹ and ۰.۱۱ mg kg-۱), with Ti and Fe leached from amended soil with TiO۲ and Fe۳O۴ (۱.۶۴ and ۰.۱۵ mg kg-۱) and amended soil with modified TiO۲ and Fe۳O۴ with chitosan (۱.۴۷ and ۰.۰۹ mg kg-۱) was not significant, while Al leaching in control soil (۰.۵۱ mg kg-۱) with amended soil with Al۲O۳ (۱.۰۶ mg kg-۱) significantly different. This study demonstrated Ti and Fe were stable in soil column. Studies have shown that the environmental toxicity of Al causes different diseases, include of Alzheimer and Lung-Kidney disease in human body. Therefore, more studies on evaluation of the ecological toxicity of NPs for living organisms and the bioavailability and bioaccumulation of these substances through food chains are recommended.

کلیدواژه ها:

Pollutant ، Adsorbent ، Soil columns ، Leaching ، Environment