https://repositorio.ufba.br/handle/ri/19215 2026-04-17T11:55:06Z https://repositorio.ufba.br/handle/ri/43200 Título: Ocorrência de compostos policíclicos aromáticos heterocíclicos contendo enxofre (PASHs) e mercúrio na biota marinha: uma perspectiva químico-ecotoxicológica Autor(es): Nascimento, Melise Lemos Primeiro Orientador: Andrade, Jailson Bittencourt de Abstract: This study employed polychaetes and corals as tools to determine the occurrence of harmful substances in the environment, such as sulfur-containing Polycyclic Aromatic Heterocycles (PASHs) and the metal mercury (Hg), along the coastal zone of the state of Bahia. For polychaetes, 14 PASH compounds were quantified, with the highest concentrations detected via GC-MS being ∑2,8-DMBT (5,960 ng g⁻¹); ∑4-MDBT (2,160 ng g⁻¹); and ∑3-MBT (1,136 ng g⁻¹). The samples with the highest PASHs and THg concentrations were collected in the Itaparica region. In corals, 8 PASH compounds were detected, with the highest concentrations found for ∑BT (2,790 ng g⁻¹); 2-MBT (2,163 ng g⁻¹); and 2,1-BPT (1,650 ng g⁻¹). To further investigate potential chemical aspects influencing the bioaccumulation of both pollutants in biota, Spearman multivariate correlations were established between the concentrations of these contaminants. For the interpretation of significant correlations, the thiophilicity theory (sulfur affinity) was applied. This theory uses an affinity scale that provides a framework to justify possible positive interactions between the sulfur atom present in the structure of PASHs and the mercury element. In addition to determining the occurrence of PASHs and THg in the environment, an in vivo test was performed with the model organism Artemia franciscana, aiming to expand knowledge on the toxic effects of PASHs in marine organisms. The tests conducted involved toxicity and bioaccumulation in the presence of dibenzothiophene (DBT) and mercury chloride. Results observed for Artemia franciscana showed a 100% increase in mortality in the model organisms under simultaneous exposure to DBT and mercury at equivalent concentrations. Overall, the afore mentioned experiments contribute to broadening the scope of knowledge regarding the occurrence, toxicity, and bioaccumulation of PASHs and Hg in the marine environment and biota, as well as the synergistic toxic effects when dibenzothiophene (DBT) and mercury occur simultaneously in polychaetes and corals. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Tese 0008-08-21T00:00:00Z https://repositorio.ufba.br/handle/ri/41951 Título: Zoneamento agroenergético: uma proposta de estratégia pública para o desenvolvimento integrado. Autor(es): Carneiro, Roberto Antônio Fortuna Primeiro Orientador: Torres, Ednildo Andrade Abstract: This thesis analyzed agroenergy, a highly complex renewable energy source with multiple dimensions, in the energy transition process in the context of climate change, international agreements, and the interests of groups such as multilateral agencies, large investors, politicians, environmentalists, etc. It analyzed the risks of expanding the production chains of this source in territorial spaces that have potential but also socio-environmental vulnerabilities. In this context, this thesis aimed to propose a public strategy for agroenergy zoning to promote and manage the expansion of agroenergy in the Western Region of the State of Bahia, which makes up the agricultural frontier of agribusiness known as Matopiba. The Theories of Public Choice and Strategic Public Management were selected and an exploratory, qualitative and descriptive research was carried out, as well as a bibliographic and documentary review; a mapping of interest groups for conducting semi-structured interviews; a cross-sectional analysis of existing planning instruments; and the development of a methodological model applied in the Western and Middle São Francisco regions of Bahia. The results obtained confirmed the technical feasibility of formulating, implementing and managing a Public Strategic Management model for expanding agroenergy in delimited areas, with transversal, intersectoral actions and environmental governance to minimize existing risks. However, it also confirmed the existence of what the adopted theoretical framework calls “failures” of the State in fulfilling its constitutional role, due to its degree of permeability to pressure from interest groups, which can generate political restrictions to the model proposed by this thesis based on a set of guidelines, objectives and strategic lines of action. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Tese 2024-01-01T00:00:00Z https://repositorio.ufba.br/handle/ri/41889 Título: Desenvolvimento de aplicações em cerâmica e pasta de cimento utilizando o cascalho de perfuração de poços de petróleo na construção civil. Autor(es): Maciel, Kuelson Rândello Dantas Primeiro Orientador: Gonçalves, Jardel Pereira Abstract: The Oil Exploration and Production (E&P) industry provides an important energy source for the world. However, there is worldwide concern regarding the environmental impacts of E&P activities. Drilling cuttings (DC) and drilling fluid are some of the main residues generated during the drilling of oil wells. This research aims to develop is to develop ceramic materials and supplementary cementitious materials (MCS) using the oil well drilling cascade in civil construction. This study used a DC from an onshore well in Candeias (Brazil), cuttings collected with water-based (DC1) and cuttings n-paraffin-based (DC2) fluid. A milling study of the gravel and clay was performed, varying the time (2, 5, 10, 15, and 20 min) and the rotation speed (200 and 300 rpm), in which physical, chemical, and mineralogical analyses were carried out by through analytical techniques of helium gas pycnometry, particle size analysis, consistency tests, X-ray fluorescence (XRF), X-ray diffractometry (XRD)/Rietveld, thermogravimetric analysis (TG/DTA) and environmental risk analysis. Co-processing studies were performed on ceramic materials replacement natural clay by CAP1 at levels of 15, 30, and 45%, with ceramic pieces being made by uniaxial pressing and sintered at a heating rate of 5 °C/min with a threshold of 750 °C, 850 °C and 950 °C held for 90 min. After sintering, the physical and mechanical properties were evaluated. The phases formed for the different temperatures were quantified using XRD/Rietveld. Cement pastes were produced by partially replacing early-strength Portland cement (CPV) with CAP1 and CAP2 in 0, 5, 10, 15, 20, 25, and 30%. The hydration of the pastes was evaluated by isothermal calorimetry, XRD/Rietveld, TGA/DTA, Fourier transform infrared spectroscopy (FTIR), water absorption, capillary absorption, and axial compressive strength after 1, 3, 7, 28 and 91 days of curing. In addition, it was evaluated the influence of milling on the CAP1 reactivity used as a supplementary cementitious material in ternary cement (TC). The hydration of TC pastes containing DC1 with different granulometric distributions was evaluated by isothermal calorimetry, XRD/Rietveld at 3 and 28 days, compressive strength, and absorption. DC2 was not evaluated as CT because it did not benefit from milling. The co-processing results using DC1 in the ceramic mass showed that the sintering temperature and the increase in the DC content directly influence the mechanical properties of the red ceramic, in this sense, the studied formulations are a feasible alternative for manufacturing bricks and tiles. The incorporation of benefited DC1 improved the hydration kinetics of TC compared to the reference pastes. After 28 days, TC pastes with a D50% diameter smaller than 11 μm reached at least 70% of the reference strength. Cement pastes demonstrate the potential for application between 5% and 25% in substitution of PC for DC1 and DC2. Besides mitigating an environmental problem, reducing costs with raw materials for manufacturing cementitious materials will benefit the environment by preserving mineral resources (clay and limestone deposits). In the analyzed scenarios, the results indicated DC1 as an alternative environmentally appropriate raw material for the manufacture of ceramics, and DC1 and DC2 can be used as SCM to produce cement paste and ternary cement. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Tese 2023-01-01T00:00:00Z https://repositorio.ufba.br/handle/ri/41485 Título: Determinação de compostos carbonílicos e ácidos hidroxialquilsulfônicos associados ao material particulado MP2,5 E MP10 da estação da lapa em Salvador – BA Autor(es): Cardozo, Ingrid Marcelo Melo Primeiro Orientador: Andrade, Jailson Bittencourt de Abstract: Atmospheric particulate matter (APM) is one of the main urban pollutants, composed of solid and liquid particles suspended in the atmosphere, emitted by vehicular and industrial sources. This study investigated carbonyl compounds (CC), both in free form and bound to sulfur (hydroxyalkylsulfonic acids - HASA), in APM samples with particle sizes of 2.5 μm and 10 μm collected in the subsoil of the Lapa station, in Salvador - Bahia, in 2005 and 2010, using ultrafast liquid chromatography with a diode array detector (UFLC-DAD). The analytical methodology demonstrated good figures of merit for the determination of 16 CC. In the MP10 samples, 13 CC were quantified, in the free and bound form HASA, and for the MP2.5, 14 CC were quantified in the free form and 13 CC in the bound form HASA. Crotonaldehyde was only quantified in PM2.5, and heptanal and cyclohexanone were not determined. The highest concentrations were obtained for the sum of acetone + acrolein, while the lowest were for the sum of isobutyraldehyde + butyraldehyde. In both 2005 and 2010, CC were generally in higher concentrations in the free form, with the exception of the sum of acetone + acrolein, which were higher in the bound form HASA. In the years 2005 and 2010, CC concentrations in PM10 showed an increase in 2010. The highest concentrations of CC were on Monday, in the free and bound forms, in both particle sizes studied. The results highlight the relevance of free and bound CC (HASA) due to their toxicity and carcinogenicity. This study represents a significant contribution to environmental chemistry, reinforcing the need for CC regulation in the APM and the adoption of public policies to improve air quality and mitigate health risks. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Tese 2025-02-12T00:00:00Z