Navegando por Autor "Santos, Jandyson Machado"

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Aplicação da geoquímica inorgânica na investigação da contaminação ambiental de sedimentos do Rio Ipojuca, Caruaru/PE, Brasil
(2021-07-15) Bezerra, Emanuelle da Silva; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/7596013067584452
In the study about contamination of aquatic environments, the chemical characterization of sediments in the context of inorganic geochemistry with metal determination can provide important information, as the historic contamination of the aquatic ecosystem, leading to the knowledge of quantity, quality, period and effects caused by that contamination, most often from anthropic activities. The current study aims to achieve the quantification of metals by Inductively coupled plasma optical emission spectroscopy (ICP-OES) of sediments from the Rio Ipojuca, in the stretch of the municipality of Caruaru, state of Pernambuco, in order to identify the level of contamination through these elements, based on the values of the quality guide described on the resolution of CONAMA nº 454/2012. The values of Cr, Cu, Pb and Zn revealed that the sediments are with values higher than the limit value of the Level 1 quality's reference (VRQ1) for the most samples, which indicates that they are above the determined level from which there is less probability of adverse effects on the biota. Furthermore, for the concentration of Cr and Zn, two of the samples were found with concentrations higher than the limit value for the Level 2 quality's reference (VRQ2), leading to regions with values above the determined which there is a greater probability of adverse effects on the biota. In order to follow the resolution of CONAMA nº 454/2012, nine of the ten sediments studied fit the condition in which there is a need to carry out additional experiments, as ecotoxicity tests, due to the values above VRQ1 and VRQ2 indicate a potential contamination. Through the multivariate statistics analysis (PCA e HCA/heatmap) we have found a visualization that show a trend from less contaminated to more contaminated sediment, in which the most contaminated are located close to the urban centers of Caruaru City, pointing out that human activities are responsible for this environmental contamination. Thus, it is possible to conclude that there is a broader need for environmental monitoring of the Rio Ipojuca regarding heavy metal concentrations in the aquatic system, in a way that there is a continuous assessment of its quality and the harmful effects that the contamination may represent.
Avaliação da composição química de óleos de derramamentos por espectrometria de massas de ultra alta resolução
(2025-07-03) Salata, Ana Beatriz Alves de Miranda; Santos, Jandyson Machado; Pereira, Marília Gabriela Araújo; http://lattes.cnpq.br/4388998153970406; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/2519974430606408
O petróleo é uma mistura química complexa composta predominantemente por hidrocarbonetos, que contém uma fração polar constituída por compostos com heteroátomos do tipo S, N e O. O petróleo desempenha um papel vital na economia global, sendo essencial como fonte de energia e matéria-prima industrial. No entanto, eventos de derramamentos de óleos representam uma séria ameaça a ambientes marinhos e costeiros, como ocorreu no desastre do ano de 2019 na costa nordestina do Brasil. Após um derramamento, o petróleo sofre processos físicos e químicos, como espalhamento, dissolução, evaporação, fotooxidação e biodegradação. Tais processos estão associados ao intemperismo do óleo no ambiente, que podem contribuir para o agravo da contaminação, devido a formação de novos constituintes químicos nocivos. Este estudo utilizou a abordagem em petroleômica para investigar óleos derramados coletados na costa de Pernambuco entre os anos de 2019 a 2021, com o objetivo de entender as alterações químicas dos compostos polares ao longo do tempo, devido à longa exposição do óleo a ambientes terrestres e aquáticos. Foram analisadas três amostras: SO (óleo coletado no primeiro mês do derramamento de 2019), SA (coletado após 16 meses em ambiente aquático marinho) e ST (coletado após 19 meses em ambiente terrestre costeiro). As análises foram realizadas por espectrometria de massas de ultra-alta resolução (FT-ICR MS) com ionização por electrospray nos modos ESI(+) e ESI(-). Por ESI(+), foram identificadas as classes N, NO, NO2, NS, O, O2S e OS, havendo pouca variação da intensidade delas quando comparadas as amostras entre si. Por ESI(-), maiores diferenças entre as amostras foram encontradas, sendo as principais classes: N, NO, O2, O3, O4, OS, e combinações de classes oxigenadas com enxofre (OS, O2S). Para a classe N, menores intensidades foram observadas nas amostras SA e ST, sugerindo degradação dos compostos nitrogenados, quando o óleo derramado ficou exposto ao ambiente aquático marinho ou terrestre, respectivamente. Em contrapartida, as classes Ox (x = 1 - 4) possui maiores intensidades em SA e ST, indicando que o óleo derramado sofreu processos de foto-oxidação e biodegradação nos ambientes. Razões entre classes heteroatômicas também foram calculadas, que apontaram o impacto do grau de biodegradação e foto-oxidação nas amostras SA e ST, quando comparadas a amostra do óleo derramado inicialmente (SO). Assim, os dados mostraram padrões distintos de compostos polares nas amostras, evidenciando a influência do intemperismo na modificação química dos óleos ao longo do tempo e em diferentes ambientes de exposição ambiental, fornecendo informações valiosas para entender o comportamento químico de óleos derramados a nível molecular.
Avaliação da contaminação ambiental por hidrocarbonetos do petróleo em sedimentos do rio Ipojuca, Caruaru, Pernambuco, Brasil
(2021-06-15) Moreira, Thayane Cristina da Silva; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/0370512046415428
The hydrographic basin of the Ipojuca River, in the state of Pernambuco, Brazil, is about 320 km long and includes 25 municipalities, one of which is the city of Caruaru, which is a municipality of regional importance, representing approximately 2.43% of the state GDP. In the region, the river is used for leisure, fishing, human, agricultural, and industrial supply, and may be exposed to several contaminants, including those from the use of petroleum derivatives. Therefore, it is extremely important to evaluate the level of contamination and the impact caused to these aquatic environments, through the identification with geochemical biomarkers, aiming to identify the compounds of the classes of aliphatic hydrocarbons (AHs) and polycyclic aromatic hydrocarbons (PAHs), which are considered bioaccumulative and toxic and may have carcinogenic and mutagenic potential. The present study aimed to carry out the chemical characterization of ten surface sediment samples collected from the Ipojuca River, in the stretch related to the municipality of Caruaru/PE, in order to identify and quantify HAs and PAHs, to obtain the level of contamination of the aquatic system. The HAs were detected with carbon numbers from C15 to C37, which, through diagnostic ratio calculations, such as the preferential carbon index (PCI), indicated contamination sources of petrogenic and biogenic origin in the sediments. The isoprenoids pristane (Pr) and phytane (Ft) were also identified in all sediments, where the Pr/Ft ratio pointed to contamination referring to the presence of petroleum hydrocarbons. For PAHs, it was possible to identify and quantify 21 compounds, which, according to the absolute concentration values and through the diagnostic ratios, could classify the contamination level of the field sediments in a moderate to a high degree, indicating petrogenic and pyrogenic sources in the formation of organic matter in the sediments. Thus, it was possible to infer that the studied aquatic system is with a relevant contamination level for the studied compounds. Thus, it is expected that the results obtained can help agencies responsible for the preservation and recovery of the Ipojuca River.
Avaliação geoquímica temporal de óleos do derramamento de 2019 no litoral de Pernambuco
(2023-09-19) Lima, Isabelle Farias Silva de; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/0023973040247708
Avaliação temporal de biomarcadores de petróleo empregados no estudo de derrames simulados em ambientes terrestres
(2019-07-09) Nascimento, Rayane Maria do; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/0803223548753880
Desenvolvimento de metodologia analítica sustentável para quantificação do corante artificial vermelho allura AC em balas alimentícias
(2024-03-04) Coutinho, Maria Eduarda Bezerra; Santos, Jandyson Machado; Gomes, Bruna Ramos de Souza; http://lattes.cnpq.br/4086942894025609; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/0500898038657595
In Brazil, it is estimated that around 8% of children under 3 years of age have food allergies, caused by the inflammatory response after eating certain foods, especially sweets. This harmful effect may be associated with the presence of artificial colorings, such as Allura Red Ac (INS-129), which is commonly added to food candies. Therefore, industries must follow the standards established by the National Health Surveillance Agency (ANVISA), since excess of the Acceptable Daily Intake (ADI) of this dye can cause potential adverse risks, such as hypersensitivity reactions, similar to allergies, hyperactivity in children, as well as the risk of developing inflammatory diseases in the intestine, making it important to develop methods to quantify this dye in foods. Faced with this problem, the objective is to develop a sustainable analytical methodology capable of carrying out the determination and quantification of the Allura Red Ac dye in food candies, through a simple, easy-to-execute and economically accessible method, using the UV-Vis Spectrophotometry technique.. When carrying out the experimental analyses, analytical curves were obtained with standard solutions of the Allura Red Ac dye, where the relationship between the intensity of the coloring as a result of the increase in the concentration of the analyte was verified, thus obtaining a linear correlation between absorbance versus concentration, with coefficient of determination (R2) in analyzes by UV-Vis molecular absorption spectrophotometry. Quantification of three different bullets was carried out in three analytical protocols: I) the reference method of the Adolfo Lutz Institute that uses ammonia methanol; the proposed method using water as a solvent; III) the Adolfo Lutz Institute reference method with adaptations. A higher dye concentration was observed when the proposed method was used, with Confidence Level = 95%. Thus, it was possible to quantify the Red allura Ac dye in ten food candies sold in Brazil through Quimica Verde. The proposed method has the potential to be implemented as a routine method in the quality control of commercial candies.
Investigação das modificações químicas de biomarcadores de petróleo submetidos a derrames simulados em ambientes aquáticos
(2021-12-15) Oliveira, Milton Neto Nascimento de; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/4629247582941612
The oil industry characterizes a source of risks to the environment. Studies that aim to understand the chemical modification in oil spill situations are gaining greater attention due to recurrent environmental disasters, such as the one that occurred on the coast of Brazil in 2019. The purpose of this study was to apply a laboratory simulation of oil spills in aquatic environments, to evaluate the chemical changes in composition of oils using the technique of gas chromatography coupled to mass spectrometry (GC/MS) and infrared spectroscopy (IR). For the simulations, a homemade system was used that were a chamber with white, blue and ultraviolet lamps, referring to wavelengths like those emitted by solar radiation, where inside was allocated a mixture of oil and seawater 1:80 (m/v), and the oil spill simulation was performed to obtain aliquots of oil at different times of exposure. The oil aliquots were analyzed by GC/MS, in order to obtain a comparative analysis of the initial crude oil (control) and the same oil after the spill exposures, which was possible to evaluate the chemical changes of oil biomarkers and their diagnostic reasons. The chromatograms showed a decrease in the peak areas of the n-alkanes with lower molecular weight in the first hours of exposure to the simulated spill, however, no significant changes were observed in the diagnostic ratios for biomarkers of the sterane and terpane classes, showing that they are classes that do not change chemically. The IR was performed in the spectral range of 600-4000 cm-1, using attenuated total reflectance (ATR). The IR data showed peaks related to the majority chemical composition of crude oils, referring to aliphatic hydrocarbon compounds. It was also possible to identify peaks related to the appearance of new stretching linked to chemical changes associated with the photo-oxidation process that occurred in the spill simulation, referring to peaks for oxygenated compounds, in the region of 1233 cm-1. Thus, the study was able to identify some changes in the chemical composition of crude oils after simulated spills in aquatic environments, as well as to show that the consolidated diagnostic ratios involving terpanes and steranes do not change, and in both cases can be used in studies to track oil spills in environments and/or as data for remediation of environments impacted by spills involving the oil industry.
Monitoramento geoquímico e ambiental de solos na Área de Proteção Ambiental Santa Cruz, Pernambuco - Brasil
(2019-12-19) Cunha, Lilian Maria Gomes da; Moraes, Alex Souza; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/0440163845324480; http://lattes.cnpq.br/1839740899121271
The importance of the Santa Cruz Environmental Protection Area is attributed to its biodiversity and primary and secondary productivity, representing an ecological unit of great environmental and socioeconomic significance for the state of Pernambuco. The Santa Cruz Canal Estuarine Complex is recognized as an ecosystem quite vulnerable to pollution and contamination caused by improper land use and occupation. The analysis of heavy metals in soils (Arsenic, Cadmium, Chromium, Copper, Nickel, Lead and Zinc) was used to make situation graphs of the environmental liabilities in which the Santa Cruz APA is located. The results were compared with CONAMA resolution 420/2009 as a guiding model for the reference values of contaminated soil quality. Thus, it was observed that for the arsenic and cadmium elements there were values above the allowed values, suggesting that there is an environmental impact registered in the Santa Cruz EPA probably resulting from agricultural activities and local urban expansion. It can be concluded that there is a need for increased environmental monitoring in both soil sample quantity and environmental parameters, as evidence of environmental disturbances in areas of strategic interest such as APAs has been the result of research. that are in line with the needs of public management.
Utilização de técnicas analíticas instrumentais voltadas para a datação de tinta de caneta na química forense
(2021-12-14) Braga, Kauanny Beatriz do Nascimento; Santos, Jandyson Machado; http://lattes.cnpq.br/4137257750865101; http://lattes.cnpq.br/6073573253074251
Forensic chemistry connects science with justice, applying scientific techniques and methodologies that help in finding information and elucidation of crimes committed by identifying different types of chemical compounds, thus facilitating criminal investigations. Among the different areas that make up forensic chemistry, documentoscopy is of great importance. It is responsible for providing historical information of a document, evaluating its veracity for legal purposes, such as in an attempt to date writings with a pen. In our study, simulations were carried out in an aging laboratory for blue ballpoint pen inks, focusing mainly on the Crystal Violet (Basic Violet 3) compound, which is the main chemical constituent of pens. The inks were subjected to a camera with the direct incidence of lamps with emission in the ultraviolet and visible regions, at different exposure times and the analyses were performed by infrared (IR) spectroscopy by Fourier transform with attenuated total reflection mode to assess the degradation of the chemical composition of inks. The IR spectra showed regions with peaks that suggested some interesting changes in the chemical composition after the artificial aging process, for the peaks in 752, 1244, and 1584 cm-1. Thus, the proposal was also used in an attempt to date pen ink for real documents containing writings dated between the years from 1975 to 2017. The data showed similarity with the results found in the simulated aging experiments, where it was possible to notice main-ly that there was a reduction in the absorption band referring to the 1584 cm-1 peak, due to chemical modification related to the C=N bond in the Basic Violet 3 molecule. Furthermore, a divergence between the IR spectra between the artificially aged samples and the real ones, for the peak at 752 cm-1, suggests that there may be more than one degradation mechanism in the paint aging process. Thus, the proposed method demonstrates the potential for performing routine analyses in the field of documentoscopy, for pen ink dating.