Caracterização de óxido de zinco (ZnO) e óxido de magnésio (MgO) utilizados em estudos de absorção aplicados ao desenvolvimento de milho (zea mays)"

Abstract

Nanotechnology is an area widely explored for the most different purposes and interest in its studies has grown exponentially in recent decades. However, there are few scientific contributions that emphasize the use and application of nanoparticles in agriculture. In this sense, the present work aims to study the effects of the applications of zinc oxides (ZnO) and Magnesium oxide (MgO) in the soil for corn cultivation. This application uses samples of pure ZnO and ZnO/MgO (1:1 mixture by mass), both on a nanometric scale, which were previously synthesized by combustion reaction and characterized by X-ray direction and infrared spectrometry, and were also bulk scale samples (commercially acquired) were applied. An experimental design was structured to analyze the effects of different dosages and treatments for the samples in comparison with the control group. For this comparison, the levels of magnesium and zinc present in the samples, from the roots and leaves of the plants, were characterized using atomic absorption spectrometry. Using transmission electron microscopy (TEM), it was possible to observe the particle sizes of the oxides used in theApplications. Furthermore, the purity of these materials was measured through energy dispersive x-ray analysis (EDS coupled to TEM). From atomic absorption spectroscopy analyzes it was possible to compare the applications of oxides and analyze how the treatments influenced the absorption of Zn and Mg in the leaves and roots of plants in comparison to the control. It was possible to observe that the applications carried out in which commercial ZnO oxides were present on a bulk scale influenced the increase in Zn absorption in the samples. This behavior is discussed in terms of the relationship between the particle sizes of the oxides and their surface areas.