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Eclética Química
Revista Activa *
ISSN: 0100-4670 ISSN electrónico: 1678-4618
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Química
Universidade Estadual Paulista Júlio de Mesquita Filho
Brasil



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429ArtículosÍndice deinternacionalizaciónEn coautoriaÍndice deesfuerzo editorial
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Assis Vicente Benedetti
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en: The elimination of residual drugs from pharmaceutical and domestic sources is a growing concern, as they are able to reach water and soil resources and can present environmental and health risks even in very low concentrations. Traditional water and wastewater treatment systems have not been efficient in the removal of these compounds, evidencing the importance of the development of new remediation methods. In view of the applicability and versatility of electrocoagulation techniques in the removal of pollutants, the aim of this work is to evaluate the parameters: biochemical oxygen demand (BOD), chemical oxygen demand (COD), color, turbidity, algestone acetophenide (AAc) and estradiol enanthate (EEn) using a pilot treatment system, as well as phytotoxicity and Brine shrimp toxicity. The study showed good removal efficiency, comprising remarkable remediation performance assayed through BOD (61.5%), COD (58.6%), color (83.1%), turbidity (96.7%), AAc (77.0%) and EEn (56.7%) after 30 minutes. For toxicity, raw effluent was considered more phytotoxic for lettuce and cucumber seeds when compared to treated effluent. The results suggest that the pilot prototype was promising, providing an increase in both the germination potential and the root growth of the seeds (Lactuca sativa and Cucumis sativus) and a significant decrease in the acute toxicity to Artemia salina.>>>
Ruiter Lima Morais
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Luane Ferreira Garcia
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Emily Kussmaul Gonçalves Moreno
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Douglas Vieira Thomaz
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Laís de Brito Rodrigues
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Lara Barroso Brito
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Germán Sanz Lobón
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Gisele Augusto Rodrigues de Oliveira
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Marcella Ferreira Rodrigues
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Boniek Gontijo Vaz
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Eric de Souza Gil
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en: A voltammetric method for the cadmium quantification was developed using minimal instrumentation. A manual homemade potentiostat for linear voltammetry was used. An Ag reference electrode and auxiliary and working electrodes of writing graphite were employed for the electroanalysis. The electrolytic conditions for the quantification were stablished. Linearity, detection and quantification limits, precision and accuracy were evaluated. The conditions for the quantification were KCl 1 mol L-1 as supporting electrolyte and pH 5. The range of quantification was from 10-3 to 1.5∙10-2 mol L-1. The linear correlation (r), determination (R2) and adjusted (R2 adj.) coefficients were 0.9986, 0.9972 and 0.9970. The detection and quantification limits were 3∙10-4 mol L-1 and 10-3 mol L-1. Results showed an acceptable repeatability, with coefficients of variation from 1.5 to 5.8% depending on the concentration. Uncertainty associated with the cadmium concentration was in the range of 1.2∙10-4 to 7∙10-5 mol L-1, diminishing with the increasing of the concentration. A good accuracy was observed, with recoveries between 86.84 and 109.64%.>>>
Javier Ernesto Vilasó Cadre
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Alejandro Céspedes Martínez
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María de los Ángeles Arada Pérez
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José Alejandro Baeza Reyes
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en: Significantly, global warming which is caused by CO2 emission and energy shortage are global problems resulting from artificial photosynthesis because it required many functions (light harvesting, Z water, and oxidation scheme). Therefore, photocatalytic systems development for CO2 reduction is germane in this field. Metal complexes molecular catalyst have become prevalent homogeneous catalysts for carbon dioxide (CO2) photocatalytic reduction since it was initially known as CO2 reduction catalysts in the 70s and the 80s, while utmost part involved macrocyclic cobalt(II) and nickel(II) complexes. This review article presents a broad understanding on some active catalysts recently reported as a metal complex molecular catalytic schemes for CO2 reduction, alongside catalytic activity, stability, selectivity under electro-reduction, and photoreduction circumstances. The progress of in situ spectroelectrochemical methods, typically supported via theoretical calculations, helped to access this know-how by providing information which enabled researchers to acquire more in-depth perception into unveiling the catalytic reaction and mechanisms intermediates.>>>
Ozioma Udochukwu Akakuru
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Oyebanji Oluwatomisin Funmilayo
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en: This study proposes a new and simple method for Cr speciation and Cr(VI) determination in leather samples using digital images. The experiments were performed using a mobile phone and a free app called PhotoMetrix that was used to obtain and process data. The results obtained from PhotoMetrix were compared to reference methods using UV−Vis. A statistical evaluation between both proposed and the reference methods using two-sample t-test did not show a significant difference at a 95% confidence level. Bovine leather samples (4 samples) tanned with Cr salts and ovine leather samples (3 samples) tanned with vegetable tannin were analyzed. The proposed method presented limits of detection (LOD) and quantification (LOQ) of 0.6 and 2 mg/kg, respectively. In addition, the proposed method using PhotoMetrix and digital images can provide undergraduate students an opportunity to learn topics such as quantitative analyses, environmental chemistry, speciation chemistry, image processing and treatment of statistical data. The results demonstrated that the proposed method can be applied to routine analyses and in experimental analytical chemistry courses.>>>
Vinícius Costa
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Edenir Pereira-Filho
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Universidad Autónoma del Estado de México
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Versión 3.0 | 2018
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