At present time, nano zero-valent iron (nZVI) compounds are increasingly used as carriers of information, magnetic fluids, delivery systems for medicines, and etc. Nano zero-valent iron (nZVI) was prepared by chemical reduction from a ferrous saltsolution in the presence of PVP used as a stabilizer. Synthesis was performed under the ultrasound treatment and without it (Fe0/PVP-USandFe0/PVP). The resulting nanoparticles were characterized by X-ray powder diffraction (XRD) analysis and scanning electron microscopy (SEM), transmission microscopie (TEM) and FT-IR spectroscopie.Figure 1:(a) SEM micrograph result; (b) ESR result; (c) VSM result of Fe⁰-PVPIn Figure 1 is shown the morphological study of the obtained nanoparticles. It was proved that the synthesis carried out with ultrasonic processing allows to obtain more ordered packaging. Furthermore, the synthesized nanoparticles are protected with a polymer layer of 18-20 nm, which makes them less toxic for soil microorganisms.