@ Minashree, the iron oxide nanoparticles are present in aquatic environment and the concentration, in general, is 50 mg/L. For more details please have a look of the attached file.
Minashree Kumari
Iron oxide particles are present in soil, ores, on the surface of steel and cast iron products. Since the content of iron oxides in different soils of a given region may be different, a concentration range is given, a range of concentrations, for example, in mol of oxide per kg of soil.
Maity, D., and D. C. Agrawal. "Synthesis of iron oxide nanoparticles under oxidizing environment and their stabilization in aqueous and non-aqueous media." Journal of Magnetism and Magnetic Materials 308, no. 1 (2007): 46-55.
@Dr Yuri and @ Dr. Azeez.. thank you for the information. I am particularly interested to know the concentration NPs in aquatic environment like surface water. Limited studies are available in this regard. If you can add something.
Regards
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