| Affiliation: | 1.Departamento de Matemática-Física, Facultad de Ciencias Informáticas, Naturales y Exactas,Universidad de Granma,Bayamo,Cuba;2.Instituto de Física,Universidade de S?o Paulo,S?o Paulo,Brazil;3.Centro de Estudios de Biotecnología Vegetal, Facultad de Ciencias Agrícolas,Universidad de Granma,Bayamo,Cuba;4.Departamento de Engenharia Química,Centro Universitário FEI,S?o Paulo,Brazil;5.Instituto de Química,Universidade de S?o Paulo,S?o Paulo,Brazil |
| Abstract: | Common bean plants were grown in soil and irrigated with water solutions containing different concentrations of (hbox{Fe}_3hbox{O}_4) nanoparticles (NPs) with a mean diameter close to 10 nm. No toxicity on plant growth has been detected as a consequence of Fe deficiency or excess in leaves. In order to track the (hbox{Fe}_3hbox{O}_4) NPs, magnetization measurements were performed in soils and in three different dried organs of the plants: roots, stems, and leaves. Some magnetic features of both temperature and magnetic field dependence of magnetization M(T, H) arising from (hbox{Fe}_3hbox{O}_4) NPs were identified in all the three organs of the plants. Based on the results of saturation magnetization (M_mathrm{s}) at 300 K, the estimated number of (hbox{Fe}_3hbox{O}_4) NPs was found to increase from 2 to 3 times in leaves of common bean plants irrigated with solutions containing magnetic material. The combined results indicated that M(T, H) measurements, conducted in a wide range of temperature and applied magnetic fields up to 70 kOe, constitute a useful tool through which the uptake, translocation, and accumulation of magnetic nanoparticles by plant organs may be monitored and tracked. |
