The silicon or silicon dioxide (SIO2) it's a natural compost that is the most used as the percursorof new materials. With a high level of crystallinity, it can be very usefull inside the elaboration of new products. As a finite product, there is a need to comply the demands in altenate ways. The current work comes up with an ash characterization that is provided from the sugar cane bagasse ash and the production of a material that presents an higher level of crystallinity. The characterization was maide thrugh the diffraction of an X-Ray after samples being submits inside different acid treatments and calcination. The diffractograms analyses demonstrate that it was possible to achieve the Alpha-Quatrz that presents an higher crystallinity with a comparison to the samples that were not receveing the treatment, proving this way, that thermal and acid treatments were effective. Beyond, the material obtains the utilization on different types of following up.
Stainless steels have gained great utility because of their characteristics of excellent resistance to corrosion, among other characteristics. The most varied uses expose them to various situations of temperature, pressure and contact with various substances, causing corrosion even with good resistance. The objective of this work was to study the electrochemical action of benzotriazole and sodium nitrate in the corrosion of stainless steel ABNT 304 in hydrochloric acid. Measurements of open circuit potential, polarization curve and optical analysis were used at a temperature of 24 ± 1 ° C. The results of the optical analysis showed a corrosive effect on stainless steel ABNT 304 in the presence of HCl and sodium nitrate and less corrosion in the presence of benzotriazole. Open circuit potential measurements for benzotriazole showed little representative inhibitory protection and sodium nitrate functioned as a catalyst. The polarization curve confirms the previous results.
Water can undergo natural physico-chemical changes, but it is
often caused by anthropogenic action due to improper disposal of effluent.
These changes lead to eutrophication, which results in a high index of nutrients
such as phosphorus and nitrogen, leading to vegetation growth. Other
consequences may be fish mortality, dark water color of water, strong odor
and transfer of pathogens, which endangers population health. The present
work had as objective to perform analyzes of total phosphorus in the
Municipal Spa of Quatá-SP. The method used for the analyzes was Phosphorus
with Reactive Orthophosphate, adapted from the Standard Methods for the
Examination of Water and Wastewater and the results were compared with
the trophic state classes and the parameters of the legislation. At the end of
the analyzes, the values obtained from EIT were considered high,
compromising the quality of the water in some points.
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