VANESSA SILVA GRANADEIRO GARCIA

VANESSA SILVA GRANADEIRO GARCIA

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Toxicidade aguda e avaliação de riscos ecológicos de fármacos pertencentes a diferentes classes detectados em ambientes aquáticos
2021 - TOMINAGA, F.K.; BOIANI, N.F.; GARCIA, V.S.G.; SILVA, T.T.; LEO, P.; BORRELY, S.I.
Avaliação da toxicidade da mistura de fármacos submetidos a irradiação por feixe de elétrons
2021 - BOIANI, N.F.; SILVA, T.T.; TOMINAGA, F.K.; GARCIA, V.S.G.; BORRELY, S.I.
Ecotoxicological approach of surfactants treated by ionizing radiation
2021 - GARCIA, VANESSA S.G.; ROSA, JORGE M.; SILVA, THALITA T.; BORRELY, SUELI I.
Removing surfactants from liquid effluents has been a fundamental issue since they are found in several industrial effluents, hospitals, restaurants, and even homes. When disposed into aquatic environmental, surfactants can implicate in significant changes, including several adverse effects to aquatic organisms. The present study was developed to assess the ecotoxicological effects of surfactants (anionic and nonionic) to aquatic organisms Vibrio fischeri bacteria, Daphnia similis crustacean. The ionizing radiation (Electron Beam Irradiation - EBI) was applied as a possible technology for the treatment of these contaminants in order to reduce acute toxic effects. The obtained data showed that the surfactants were toxic for both organisms, and the nonionic were more toxic than anionic. EB irradiation reduced surfactants toxicity by 40% acute toxic effects for nonionic surfactant and more than 70% for anionic, for both exposed organisms classes.
Toxicity and color reduction of reactive dyestuff RB21 and surfactant submitted to electron beam irradiation
2019 - MELO, CAMILA G.; ROSA, JORGE M.; GARCIA, VANESSA S.G.; BORRELY, SUELI I.; PEREIRA, MARIA da C.C.
There is an unwelcome reaction between the coloring and the water during the dyeing procedure, a portion of the coloring agent is lost in the bathing and it will compose the final whole effluent. The high absorbance index is related to lost dyes and they also contribute with the toxic effects to the aquatic biota. In addition, these effluents contain large quantity of surfactants applied during dyeing baths, which also contribute to the high toxicity in these samples. The objective of this study was to evaluate electron beam irradiation technology, applied in samples of the Color Index Reactive Blue 21 (RB21) dye and in samples of surfactant nonionic and in order to reduce toxicity for both and for RB21, color reduction. Among the objectives of the study there are the dye exhaustion degree, and some physic-chemical parameters. The acute toxicity assays were carried with Daphnia similis microcrustacean and the results for of dyestuff solution were: the irradiated samples with concentration of 0.61g.L-1 did not present significant results, the EC 50(%) value was to 58.26 for irradiated sample with 2.5kGy and EC 50(%) 63.59 for sample irradiated with 5kGy. The surfactant was more toxic than RB 21, with EC 50(%) value at 0.42. The color reduction reached 63.30% for the sample of the lowest concentration of effluent. There was a reduction of pH during irradiation.
Toxicity of textile effluents treated by electron beam technology
2019 - GARCIA, VANESSA S.G.; BOIANI, NATHALIA F.; ROSA, JORGE M; BORRELY, SUELI I.
The textile industry uses expressive amount of water during the production and generate effluents that contain residuals of dyes, surfactants, peroxides, acids and salts, and toxicity. In addition, the textile effluents are commonly colored, because the dyes used in fibers dyeing usually have low fixation and high solubility. Many of the mentioned products are not easily removed, requiring additional treatment steps. Advanced Oxidative Processes, such as electron beam irradiantion (EBI), can be a good alternative to reduction of organic pollutants from effluents. Therefore, studies on these contaminants in aquatic environment are important for assessing their impacts on ecosystems and water quality. The objective of this study was to evaluate the toxicity of textile effluents treated with EBI. The doses of 2.5 kGy and 5.0 kGy were used. The toxicity assays were performed with Daphnia similis organisms, exposed to samples during 48 hours, and the results expressed by EC50 (median effective concentration). For the textile effluent, EC 50% values ranged from: 2.95 ±0.13 (raw effluent) until 20.90 ±1.48 (irradiated effluent, at 5kGy). The EBI treatment was effective for toxicity reduction, with efficiency higher than 60% (2.5 kGy) and 80% (5.0 kGy). The study of organic and inorganic contaminants, presents in these effluents, demonstred EC 50 values below 5%. These results demonstrate high toxicity of contaminants from textile effluents for aquatic organisms (D. similis, cladocera). Similar data was observed for the raw effluent. These values are relevant for thinking radiation as a possible technology for such a type of effluent.
Electron beam irradiation of combined pharmaceuticals
2019 - BOIANI, NATHALIA F.; VILLARDI, BRUNO D.Q.; GARCIA, VANESSA S.G.; BORRELY, SUELI I.
There are serious evidences that justify the search for treatment technologies or processes combination for the improvement of decomposition for dozens of pharmaceuticals in wastewaters. Electron beam irradiation may play an important role in this scenario and relatively low doses have been reported for such purposes. The aim of the present study was to evaluate the toxic response of the crustacean Daphnia similis exposed to individual and combined pharmaceuticals. Several experimental trials of an acute immobilization test were performed with a mixture of pharmaceuticals composed of fluoxetine hydrochloride (Prozac®), and propranolol. Single pharmaceuticals were first tested separately. Toxicity of binary mixture was then assessed using five concentrations and 5 percentages of each substance in the mixture (0, 25, 50, 75, and 100%). Acute EC50% values ranged from 5.0 to 7.4 for fluoxetine and from 11.3 to 13.7 for propranolol. In mixture, values ranged from 6.4 to 9.8. Fluoxetine was more toxic for D.similis than propranolol. The different pharmaceuticals concentrations employed in a mixture showed no difference in toxicity values. When electron beam irradiation was applied, approximately 80% of acute effects were reduced at 5 kGy, and the mixture containing a higher percentage of fluoxetine, also showed a greater reduction of toxicity.
Efluentes têxteis
2018 - GARCIA, VANESSA S.G.; BORRELY, SUELI I.; ROSA, JORGE M.
Com um faturamento superior a US$ 330 bilhões ao ano, o setor têxtil possui expressividade na economia mundial. Este setor utiliza importante quantidade de água durante a produção, enquanto gera efluentes que contém residuais de surfactantes, peróxidos, ácidos e sais, podendo apresentar elevada carga tóxica. Além disso, comumente os efluentes têxteis apresentam coloração. Os Processos Oxidativos Avançados vêm sendo utilizados para melhorar a tratabilidade desse tipo de efluente, complementando o tratamento biológico. A irradiação com feixes de elétrons tem sido proposta como tecnologia para a redução da toxicidade, coloração, demanda química de oxigênio e carbono orgânico total em efluentes têxteis. O objetivo do presente estudo foi avaliar a toxicidade de três compostos, utilizados no processo de beneficiamento das fibras de algodão, a organismos aquáticos, bem como o uso da tecnologia por feixe de elétrons visando à redução da toxicidade e cor de efluentes. Os ensaios de toxicidade para efeito agudo foram realizados com organismos aquáticos: a bactéria Vibrio fischeri e o microcrustáceo Daphnia similis, que foram expostos ao peróxido de hidrogênio, metassílicato de sódio e dispersante/sequestrante. O efluente, bem como o sequestrante/dispersante foram submetidos à irradiação em acelerador de feixe de elétrons (EBI), com variação de dose entre 0,5 e 20 kGy. Os compostos selecionados apresentaram toxicidade para ambos os organismos: peróxido de hidrogênio CE50 = 0,98 mg/L (D. similis) e 0,69 mg/L (V. fischeri). O dispersante/sequestrante apresentou valor de CE50(%) de 32,00 para V. fischeri. Quando submetido ao tratamento com irradiação (2,5 kGy) houve melhora em relação à toxicidade para o mesmo organismo (eficiência de 25%). O tratamento com irradiação melhorou a toxicidade e a coloração do efluente. A eficiência de redução da toxicidade foi de aproximadamente 50% para D. similis e 80% para V. fischeri (dose = 10 kGy). A remoção da coloração foi superior a 90%, nas mesmas condições. Nota-se a importância da análise isolada de contaminates presentes em efluentes têxteis, sendo possível caracterizar os compostos de maior toxicidade para organismos que são representativos na biota aquática. A irradiação por feixe de elétrons apresentou resultados promissores do ponto de vista de melhoria de tratamento deste efluente, com redução de toxicidade e coloração.
Electron beam irradiation of textile effluents and non-ionic ethoxylated surfactant for toxicity and color removal
2017 - SOLE, STEPHANIE V. DEL; GARCIA, VANESSA S.G.; BOIANI, NATHALIA F.; ROSA, JORGE M.; SILVA, LEONARDO G. de A. e; BORRELY, SUELI I.
Textile industry has an expressive scenario in the world economy and Brazil is the 5th in the textile production. By 2015, Brazilian textile production represented US $ 39.3 billion, accounting for more than 1.8 million tons of fabric (ABIT, 2017). The effluents from textile industry are highlighted by quantity of wastewater discharged and variety of substances (dyes, bleaching agents, surfactants, salts, acids, among others). Such compounds often prove to be toxic to aquatic biota. This present study aims to assess toxicity of whole effluents, before and after irradiation (by electron beam accelerator, EBI). In addition, the reduction of the effluent color after irradiation is also very important. Daphnia similis and Vibrio fischeri were the biological systems applied for toxicity evaluations. Previous results demonstrated the surfactant as the main toxic compound, in the untreated and irradiated forms, EC 50 = 0.44 ppm ± 0.02 (untreated); EC 50 = 0.46 % ± 0.07 (irradiated). The irradiation was effective in reducing the color of the effluent, starting from 0.5 kGy. EB radiation may be proposed as an alternative treatment for the final effluent from textile processing, mainly for reuse purposes.
Ecotoxicity and contamination assessment into Cubatão River sediments, SP-Brazil
2011 - GARCIA, VANESSA S.G.; MESQUITA, LETICIA C.A.; SANTOS, DYMES R.A. dos; VUKAN, WILLY; VIEIRA, ANDRE S.; FAVARO, DEBORAH I.T.; BORRELY, SUELI I.
Reduction of acute toxicity of the pharmaceuticalfluoxetine (PROZAC) submitted to ionizing radiation to Vibrio fischeri
2011 - SANTOS, DYMES R.A.; GARCIA, VANESSA S.G.; VILARRUBIA, ANNA C.F.; BORRELY, SUELI I.