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Search Results: 1 - 10 of 19935 matches for " Pereira Madson Godoi "
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Impactos ambientais causados pela minera??o e beneficiamento de caulim
Silva, Alessandro Costa da;Vidal, Mariangela;Pereira, Madson Godoi;
Rem: Revista Escola de Minas , 2001, DOI: 10.1590/S0370-44672001000200010
Abstract: kaolin is a kind of clay mineral that essentially contains kaolinite. it is a very important mineral used in many manufactured products, such as: paper, porcelain, fertilizer, cosmetics and others products. in brazil the extraction and processing of this kaolin are very important social and economic activities. on the other hand, there also exists an inherent environmental impact. laws were passed to mitigate these impacts and today mining companies have to present environmental impact reports (eias/rimas) in which they have to include a plan for recuperating degraded areas (prad) to solve any future problems. from the global economic, environmental and sustainable development conscience, these kaolin mining companies operating under isos 9000 and 14000 regulations could have "green stamps" of environmental quality, which would give them an advantage in the national and international marketing.
Impactos ambientais causados pela minera o e beneficiamento de caulim
Silva Alessandro Costa da,Vidal Mariangela,Pereira Madson Godoi
Rem: Revista Escola de Minas , 2001,
Abstract: Caulim é um tipo de argila constituída principalmente por caulinita, sendo empregada na fabrica o de vários produtos, tais como papel, porcelana, adubos, cosméticos, etc. Apesar de sua elevada importancia sócio-econ mica para o país, sua extra o e beneficiamento provocam impactos ambientais. Para mitigar esses impactos existem leis, que atualmente exigem a elabora o de EIAs/RIMAs (Estudos de Impactos Ambientais/Relatórios de Impactos Ambientais), nos quais é imprescindível a inclus o de PRADs (Plano de Recupera o de áreas Degradadas). é preciso que as empresas que atuam nessa área se conscientizem da necessidade da preserva o ambiental e da necessidade de um desenvolvimento sustentável, a fim de poderem usufruir das ISOs 9000 e 14000, tendo o privilégio de possuir um "Selo Verde" de Qualidade Ambiental, o que favorecerá a comercializa o de seus produtos em nível nacional e internacional.
Banana Peel for Acetylsalicylic Acid Retention  [PDF]
Araceli Veronica F. N. Ribeiro, André Romero da Silva, Tiago Pereira da Cunha, Rowenna Tonani L. dos Santos, Jairo Pinto de Oliveira, Evaldo Vitor Pereira, Marcus Vinicius V. J. Licinio, Madson de Godoi Pereira, Arnaud Victor dos Santos, Joselito Nardy Ribeiro
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.712147
Abstract:
A method for adsorption involving banana peel (BP) was studied to remove the pollutant acetylsalicylic acid (ASA) in aqueous medium. The results show that bioadsorbent has satisfactory maximum adsorption capacity (2.29 mg/g) for removing this analgesic and anti-inflammatory drug in aqueous solution (pH 7.0) using the Langmuir mathematical model. The tested concentrations of this pollutant were higher than the levels commonly found in the aquatic environment. This and other results suggest the BP as an alternative to ASA removal in water contaminated with pharmaceuticals pollutants.
Evaluation of two bioadsorbents for removing paracetamol from aqueous media
Flores Nardy Ribeiro,Araceli Verónica; Belisário,Marciela; Moretto Galazzi,Rodrigo; Cazoni Balthazar,Daniele; Godoi Pereira,Madson de; Nardy Ribeiro,Joselito;
Electronic Journal of Biotechnology , 2011,
Abstract: the frequent contamination of water resources with drugs comprises one the most important environmental problems. in order to avoid serious disturbances for aquatic life, efficient and economically viable procedures should be developed for removing common pollutants, as paracetamol. from these considerations, the present work evaluated the efficiency of sugar cane bagasse (scb) and vegetable sponge (vs), two natural adsorbents commonly found in brazil, for retaining paracetamol molecules dispersed in aqueous solutions. thus, systems composed of glass columns and peristaltic pumps were optimized and, for ph, the best value was 7.0. after optimisation, adsorption isotherms were built and it was possible to calculate the macf values for scb (120.5 μg/g) and vs (37.5 μg/g). additionally, real matrices of pretreated water, from a municipal plant for water catchment, were enriched with paracetamol at 5 μm and passed through glass columns packed with scb, vs and activated carbon (ac). the results showed that scb was more attractive than ac in terms of price and efficiency (60% against 45% adsorption, respectively), while vs was responsible for removing 40% of paracetamol dissolved in the enriched water samples. thus, the proposed natural adsorbents can be classified as viable materials to remove paracetamol from water used for human consumption.
Cadmium and lead retention in fresh and rotten red meat
Lopes, Mariangela V.;Korn, Mauro;Pereira, Madson de Godoi;Santana, Eliziane Pedra de;Oliveira, Fabio Santos de;Korn, Maria das Gra?as A.;
Journal of the Brazilian Chemical Society , 2007, DOI: 10.1590/S0103-50532007000400006
Abstract: the metal sorption capacity in fresh and rotten red meat was evaluated for cd2+ and pb2+ ions at ph 6 and the process involved in the studied metal retention was discussed. for the experimental set, an eight channels multi-port selection valve was employed to mechanise the sample preparation. the cadmium and lead concentrations were determined by icp-oes. a high retention (> 80%, m/m) of cd2+ and pb2+ ions, in fresh and rotten bovine muscle was found, indicating the potential contamination risks related to the consumption of meat submitted to inappropriate conditions of abattoir, handling, storage and commercialisation. seventy per cent of the cadmium was released with the immersion of meat in acetic acid at 1% (v/v), revealing that cookery practices may act on contaminant sorptive processes in meat structure.
Evaluation of sugar-cane bagasse as bioadsorbent in the textile wastewater treatment contaminated with carcinogenic congo red dye
Raymundo, Aline Sartório;Zanarotto, Romina;Belisário, Marciela;Pereira, Madson de Godoi;Ribeiro, Joselito Nardy;Ribeiro, Araceli Verónica Flores Nardy;
Brazilian Archives of Biology and Technology , 2010, DOI: 10.1590/S1516-89132010000400023
Abstract: a methodology involving sugar cane bagasse bioadsorbent was developed in order to remove the carcinogenic congo red dye from aqueous medium. the results showed high efficiency with retention of 64 ± 6% in synthetic congo red solution and 94 ± 5% in effluent enriched with congo red, at 10.0 g of the bioadsorbent. the adsorption system provided a maximum adsorption capacity of 4.43 mg/g. tests showed independence adsorption properties, when compared with the column flow rates. the treatment units could be operated with flexibility. from the results, it was possible to conclude that sugar cane bagasse could be an adequate bioadsorbent.
Vermicompost as a natural adsorbent material: characterization and potentialities for cadmium adsorption
Pereira, Madson G.;Arruda, Marco A. Z.;
Journal of the Brazilian Chemical Society , 2003, DOI: 10.1590/S0103-50532003000100007
Abstract: vermicompost (humic material) samples were submitted to characterization by infrared spectroscopy, x-ray diffractometry, thermogravimetric analysis, electron microscopy etc. in addition, its cation exchange capacity (cec) was determined. factorial experiments were designed in order to elucidate the interaction mechanisms between cd2+ and the adsorptive sites of vermicompost. the maximum adsorptive capacity for cadmium was evaluated by a langmuir isotherm. the characterization revealed that vermicompost exhibits high cec values (ca. 72.9 meq per 100 g), high surface area (porous material), chelating groups and a maximum adsorptive capacity for cd (38.6 mg g-1) at ph 5.0. this potential application was exploited in the analysis of synthetic and real (mineral water) samples with cd concentrations of ca 5 mg l-1, requiring a preconcentration step. an enrichment factor of 100 was attained.
Vermicompost as a natural adsorbent material: characterization and potentialities for cadmium adsorption
Pereira Madson G.,Arruda Marco A. Z.
Journal of the Brazilian Chemical Society , 2003,
Abstract: Vermicompost (humic material) samples were submitted to characterization by infrared spectroscopy, X-ray diffractometry, thermogravimetric analysis, electron microscopy etc. In addition, its cation exchange capacity (CEC) was determined. Factorial experiments were designed in order to elucidate the interaction mechanisms between Cd2+ and the adsorptive sites of vermicompost. The maximum adsorptive capacity for cadmium was evaluated by a Langmuir isotherm. The characterization revealed that vermicompost exhibits high CEC values (ca. 72.9 meq per 100 g), high surface area (porous material), chelating groups and a maximum adsorptive capacity for Cd (38.6 mg g-1) at pH 5.0. This potential application was exploited in the analysis of synthetic and real (mineral water) samples with Cd concentrations of ca 5 mug L-1, requiring a preconcentration step. An enrichment factor of 100 was attained.
Influence of domestic and industrial waste discharges on water quality at Minas Gerais State, Brazil
Jord?o, Cláudio P.;Pereira, Madson de G.;Matos, Ant?nio T.;Pereira, José L.;
Journal of the Brazilian Chemical Society , 2005, DOI: 10.1590/S0103-50532005000200018
Abstract: the aquatic contamination from kaolin processing plants, as well as from untreated or inadequately treated municipal sewage, was evaluated in the ubá stream and vermelho stream, at the minas gerais state, brazil. with this purpose, samples of water, suspended material and vegetation were collected and analysed. the analyses involved the determination of the concentration of metals, nitrite, nitrate, chloride, phosphate, chemical oxygen demand and biochemical oxygen demand. the suspended material showed high concentrations (in mg kg-1) of zn (2,400) and fe (14,900), while the vegetation collected closed to the streams was heavily contaminated with al (7,120). the concentrations of nitrite, nitrate and chloride in stream water were lower than the maximum values established by the brazilian environmental standards. the phosphate and biochemical oxygen demand values exceeded 7 and 3 times respectively, the maximum concentrations for superficial water of satisfactory quality.
O abuso sexual: estudos de casos em cenas incestuosas
Malgarim, Bibiana Godoi;Benetti, Silvia Pereira da Cruz;
Estudos de Psicologia (Campinas) , 2011, DOI: 10.1590/S0103-166X2011000400011
Abstract: the psychoanalytical contribution to the comprehension of the impact of sexual abuse on psychic functioning is based upon the identification of the uniqueness of the defensive strategy when faced with traumatic anxiety. accordingly, the aim of this work was to understand the mental processes involved in psychic functioning based on psychoanalytical theory, as well as the impact of the traumatic process on psychic functioning in the case of two girls referred to a special center for sexual abuse victims. diagnostic playtime interviews and projective tests, such as rorschach and the house-tree-person drawing test were employed. it was ascertained that the functioning of the girls was characterized by a dissociative dynamic of coping with trauma and by an ambivalent identification process, which affected the subjects' symbolic abilities. in conclusion, psychotherapy for victims of sexual abuse is an essential resource for the field of mental health.
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