Navegando por Autor "Freitas, Johnnatan Duarte de"
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Item Análise da qualidade de águas subterrâneas dos municípios de Maceió e Rio largo - AL(2024-10-30) Brandão, Iago Gabriel França; Freitas, Alan John Duarte de; http://lattes.cnpq.br/7222112856028905; Freitas, Johnnatan Duarte de; http://lattes.cnpq.br/4999402869058858; Cabral Júnior, Jório Bezerra; http://lattes.cnpq.br/7439808091974845; Cabral, Mirelle Márcio Santos; http://lattes.cnpq.br/7765541308045861It is essential to consider the importance of water, a vital resource for life on the planet, when addressing the conservation of its quality. The growing awareness of the health impacts resulting from exposure to a wide range of compounds has led to the strengthening of environmental regulations and policies, such as Ordinance GM/MS No. 888, of May 4, 2021. In recent years, the search for effective ways to reduce environmental impacts has become even greater, since the risk of contamination of water resources is an environmental concern with a major impact on public health. Therefore, the study aims to evaluate and characterize the quality of groundwater, determining some physical-chemical and microbiological parameters. Five wells were selected, where the variables of pH, turbidity, electrical conductivity, color, temperature, alkalinity, total hardness, calcium, magnesium, chlorides, acidity, total coliforms and thermotolerant coliforms were analyzed. Microbiological analyses were performed to assess the presence or absence of total and thermotolerant coliforms. Subsequently, field and laboratory tests were carried out. The results obtained during the tests indicated that the analyzed waters require different treatments, inherent to their specific quality. Well 02 meets all the standards of Ordinance No. GM/MS 888/2021, however, it operated for only 3 months during the year. Samples from wells 01, 03, and 04 meet the various aspects of the ordinance, requiring only chlorine treatability to meet all potability regulations. Well 05 does not meet all the standards of Ordinance No. GM/MS 888/2021, demonstrating samples that exceeded the VMP for turbidity, color, total hardness, and chlorides.Item Boas práticas de manipulação, condições higiênico-sanitárias e composição mineral de sururu (Mytella falcata) comercializado em feiras livres de Alagoas(Instituto Federal de Educação Ciência e Tecnologia de Alagoas, 2022-07-29) Lucena, Vívian da Silva Santos; Araujo, Daniel de Magalhães; http://lattes.cnpq.br/5837261784524743; Freitas, Johnnatan Duarte de; http://lattes.cnpq.br/4999402869058858; Lopez, Ana Maria Queijeiro; http://lattes.cnpq.br/4034568781881997; Tamano, Luana Tieko Omena; http://lattes.cnpq.br/4206868438935017Sururu (Mytella falcata) is the main fishing resource of the Mundaú-Manguaba Estuarine- Lagoon Complex (MMELC), being a fundamental product for generating income for tens of thousands of families that live in the surroundings of the lagoons. In addition to its natural propensity to accumulate contaminants present in the aquatic environment, such as toxic metals, the handling of sururu is inadequate, from the subsequent stages of its collection to its disposal in the commercialization places. The present study aimed to carry out a diagnosis of good handling practices, hygienic-sanitary conditions and mineral composition of sururu in street markets in the municipalities bathed by the lagoons that make up the MMELC. For that, a checklist was prepared and applied to guide the observation of the hygienic conditions of the facilities, equipment and utensils used, handling and way of exposing the product, clothing and use of personal protective equipment, and waste disposal, among others, at the fairs in Maceió (Tabuleiro), Marechal Deodoro, Pilar, Satuba and Rio Largo. For the investigation of minerals, samples were acquired from all points of sale found in the fairs of the aforementioned municipalities. After procedures to obtain the extracts by acid digestion, the concentrations of iron (Fe), copper (Cu), manganese (Mn) and zinc (Zn) were analyzed, using the atomic absorption spectrophotometry technique, and lead (Pb), following the corresponding protocol of the Standard Methods for the Examination of Water and Wastewater (SMEWW). With the application of the checklist, it was possible to classify the hygienic-sanitary conditions in all the fairs visited as unsatisfactory. Despite this, it is worth noting that the highest percentages of adjustments were observed at the Rio Largo fair, where the assignment of space for commercialization was conditioned to participation in a training course in good food handling practices, offered by the municipality. The research also involved the application of a questionnaire for the socioeconomic characterization of the vendors. It could be noticed the predominance of female vendors, with low schooling, the sale of sururu and/or other fish as the only source of income, reaching a value close to the minimum wage. As for the micromineral composition, iron showed the highest concentrations in all samples, surpassing by more than fifteen times the values detected for copper, manganese and zinc. Regarding the toxic metal lead, the samples were within the limit allowed in bivalve molluscs. The results obtained with this work confirm the importance of sururu for countless families who sell it in open markets to earn a living and reinforce the need for a joint effort, by the market vendors and those responsible for managing these spaces, to provide the population of these locations with an environment conducive to commercialization of food. In addition, it is necessary for the competent authorities to continuously investigate the levels of highly toxic trace elements in the MMELC, so that the benefits of the consumption of sururu by the population are not counterbalanced by the risk of contamination.Item Caracterização físico-química da própolis marrom e geoprópolis no nordeste alagoano, Brasil(2024-10-24) Moura, Orlando Francisco da Silva; Freitas, Johnnatan Duarte de; http://lattes.cnpq.br/4999402869058858; Sousa, Jonas dos Santos; http://lattes.cnpq.br/3193945439772961; Marins, Élida Fernanda Cavalcanti; http://lattes.cnpq.br/5169972835746750; Silva, Cristian Bernardo da; http://lattes.cnpq.br/8903978116383659The brown propolis, produced by bees of the species Apis mellifera, and geopropolis, generated by Melipona scutellaris, are widely recognized for their significant bioactive properties, such as antimicrobial, antioxidant, and anti-inflammatory activities. This study aimed to characterize the physicochemical properties of geopropolis from the municipality of Maceió and brown propolis from the municipality of Pilar. The samples underwent extraction by maceration and Soxhlet methods, followed by detailed analyses of wax content, loss on drying, ash content, and soluble solids. The results showed that brown propolis exhibited an average mechanical mass of 29.65% in the Soxhlet extraction and 56.9% in maceration, while geopropolis had mechanical mass contents of 75.73% and 75.08%, respectively. The wax content in propolis was 22.44% (Soxhlet) and 31.20% (maceration), exceeding the legal limit in maceration. The loss on drying was 5.81% for propolis, within standards, while geopropolis showed 4.56%. The ash content was 1.87% for propolis and 65.22% for geopropolis, reflecting a higher amount of inorganic material in the latter. The quantification of phenolic compounds revealed 2.02% for propolis (Soxhlet) and 2.80% (maceration), while geopropolis contained 2.74% and 2.22%, respectively. Total flavonoids were 0.011% (Soxhlet) and 0.046% (maceration) for propolis, and 0.039% (Soxhlet) and 1.33% (maceration) for geopropolis. Antioxidant activity, evaluated by the DPPH method, was 31.94% for propolis (Soxhlet) and 73.81% (maceration), while geopropolis showed 75.82% (Soxhlet) and 86.11% (maceration). Additionally, the analysis of volatile organic compounds conducted by Gas Chromatography coupled with Mass Spectrometry revealed the presence of 66 compounds in brown propolis and 48 compounds in geopropolis. The diversity of volatile compounds, including esters, terpenes, and phenols, highlights the potential of these substances for therapeutic and industrial applications. These results indicate that both propolis and geopropolis possess high levels of bioactive compounds, marked by their strong antioxidant activity, suggesting considerable therapeutic potential. The physicochemical characterization of these substances is of great importance for the municipalities of Pilar and Maceió, as it enhances local natural resources and opens opportunities for the development of apicultural products with industrial and medicinal applications. Additionally, this research contributes to the strengthening of beekeeping in the region, promoting sustainable practices and valuing local culture within a context of conservation and health.Item O lúdico na aprendizagem de vidrarias de laboratório de química na Escola Estadual Dr. Antônio Gomes de Barros(Instituto Federal de Educação Ciência e Tecnologia de Alagoas, 2018-06-08) Silva, Eronildo Ferreira da; Freitas, Alan John Duarte de; http://lattes.cnpq.br/7222112856028905; Freitas, Johnnatan Duarte de; http://lattes.cnpq.br/4999402869058858; Lira, Lidiane Evangelista; http://lattes.cnpq.br/7428353456925450; Silva, Kleyfton Soares da; http://lattes.cnpq.br/9040257542465304; Morilla, Demetrius Pereira; http://lattes.cnpq.br/5723725916193842; Sousa, Jonas dos Santos; http://lattes.cnpq.br/3193945439772961; Soares, Janaína Gomes; http://lattes.cnpq.br/9254836310407411This research aimed to approach an educational methodology that differs from traditional teaching with students of the 1st year of high school in a state public school, located in the municipality of Novo Lino, in the state of Alagoas, and evaluate learning outcomes by applying the game didactic "LEARNING GLASSES", in which it presents the main materials and laboratory glassware, also trying to help students become more interested, attentive and participative. For this construction was used the case study, which approached the playful as methodology in teaching and learning chemistry. Throughout the study and the findings, it was possible to confirm that it is feasible to approach a different methodology when applied correctly in teaching and learning.Item Monitoramento e quantificação de agroquímicos na água de poços de abastecimento urbano do município de Maceió (AL)(Instituto Federal de Educação Ciência e Tecnologia de Alagoas, 2022-07-29) Silva, José Robério Cavalcante da; Caldas, Celso Silva; http://lattes.cnpq.br/1770252259613367; Freitas, Johnnatan Duarte de; http://lattes.cnpq.br/4999402869058858; Calheiros, Altanys Silva; http://lattes.cnpq.br/9353777923030637; Simões Neto, Djalma Euzébio; http://lattes.cnpq.br/0915213331108182In recent decades, Brazilian agribusiness has grown positively, placing the country as one of the largest producers and exporters of food, resulting in a potential user of pesticides (agrochemicals) in vegetable crops, thereby reducing losses. However, in terms of health and food safety, there are no significant benefits in relation to the economic sector in Brazil, since poisoning by agrochemicals can be directly or indirectly, leaving the population exposed to acute and chronic diseases. The risk of contamination of these compounds in water resources is also an environmental and public health concern. In this context, the study aimed to estimate the level of contamination of water from domestic supply wells by agrochemicals applied in an urban area in the metropolitan region of the city of Maceió-AL, whose analyzes were carried out according to criteria proposed by the Environmental Protection Agency. - EPA, using liquid and gas chromatography techniques coupled with mass spectrometry. As a result, it was observed that during this study the 27 active principles evaluated were below the limits allowed by Brazilian legislation. As for the risk of water contamination, even with results below the recommended limits, it is recommended that there is a need to implement environmental monitoring programs and measures aimed at protecting public health, since agrochemical parameters are currently established in the evaluations the potability of water for human consumption. The treatment and control of water are, for vital reasons, ways of mitigating the spread of diseases or complications, satisfying the quality standards established for the distribution of water for human consumption.Item Sesnsibilização de pós de TIO2 modelados por esferas de látex para aplicação em células solares(Instituto Federal de Educação Ciência e Tecnologia de Alagoas, 2018-08-15) Silva, Antony Ernesto dos Santos; Barros Filho, Djalma de Albuquerque; http://lattes.cnpq.br/9259521036882745; Freitas, Johnnatan Duarte de; http://lattes.cnpq.br/4999402869058858; Costa, Alex Emanuel Barros; http://lattes.cnpq.br/2231272728491909; Silva, Antonio Osimar Sousa da; http://lattes.cnpq.br/5289388662589522The world's energy supply is derived from the burning of fossil fuels, in particular oil, producing greenhouse gases, which causes damage to the ozone layer, in addition to changing the planet's temperature and to threatening life in general. Therefore it is necessary to use natural, renewable energy sources, such as solar energy for example. Brazilian Northeast has one of the highest rates of solar radiation in the country, which makes it feasible to use solar energy in this region. Thus, this work has the objective of presenting the formation of Dye Sensitized Solar Cells (DSSCs), with semiconductor films made of titania (TiO2) powders, templated by latex spheres. These films are sensitized by ruthenium dye complexes, which makes their use relatively applicable in the absorption of solar energy. It will be possible later to convert solar energy into electric energy through the photovoltaic effect. TiO2 powders used in this work were obtained from two latex bead molds: sedimented powders and solvent controlled evaporation films (ECS). The results show that TiO2 modeling by both molds was not efficient, because the film presented a compact surface, decreasing the porosity of titania film. This can lead to a non-anchoring of the dye sensitizer on the surface of the semiconductor film and also poor penetration of the redox pair therein and the final result is a low absorption of sun light by the film. Another factor to decrease titania sensitization was the presence of carbon in during densification process, since the carbon was not completely removed. Carbon makes a surface layer that competed with the sensitizing dye during its anchoring in semiconductor film and increased the recombination of electron-hole pair. It is concluded that topography of látex beads and the presence of carbon during calcination of TiO2 powders made it difficult to absorb light when sensitized, becoming a challenge its application in DSSCs. An alternative to solve this problem is the use of TiO2 powders when obtained through templates coated on microscope glass slides by ECS technique. This will ensure an efficient porosity of titania films