Papers by Fernando Luis Fertonani
Analytica Chimica Acta, 2019
h i g h l i g h t s g r a p h i c a l a b s t r a c t Cumulative standard addition method (CSAM) ... more h i g h l i g h t s g r a p h i c a l a b s t r a c t Cumulative standard addition method (CSAM) allows analysis of small sample volumes. Calibration involves regression of added analyte mass vs. signal times total volume. Monte Carlo Method (MCM) allows flexible evaluation of the measurement uncertainty. CSAM was successfully applied to amperometric determination of uric acid in serum. Working nanocarbon electrode modified with Cu and lignin was used in the amperometry.
Eclética Química, Dec 7, 2004
The Differential Scanning Calorimetry (DSC) was used to study the thermal behavior of hair sample... more The Differential Scanning Calorimetry (DSC) was used to study the thermal behavior of hair samples and to verify the possibility of identifying an individual based on DSC curves from a data bank. Hair samples of students and officials from Instituto de Química de Araraquara, UNESP were obtained to build up a data bank. Thus to sought an individual, under incognito participant of this data bank, was identified using DSC curves.
Thermal and electrochemical studies of the interaction of organophilic montmorillonite and chlorpyrifos
Journal of Thermal Analysis and Calorimetry
Anais do IV Congresso Online Nacional de Química - IV CONDEQUI
O presente trabalho teve por objetivo investigar a liberação de íons prata (Ag + ) em solução aqu... more O presente trabalho teve por objetivo investigar a liberação de íons prata (Ag + ) em solução aquosa a partir da suspensão do compósito argila-prata(nanopartícula)/água a partir de técnica espectroscópica (FAA). As amostras para a lixiviação foram preparadas utilizando-se de argila branca, empregada na indústria de velas brancas para a filtração de água. A argila foi suspendida em solução aquosa contendo Ag(I) e submetida a irradiação com luz UV (50W nominal)/24 h sob agitação mecânica; filtrada e o compósito seco a 60 o C até massa constante. Pastilhas do compósito (0,2 g) foi adicionada de água e mantida sob agitação constante por 10, 60 e 120 min, filtradas e analisadas por FAA. Os resultados evidenciaram a remoção de 0,885% da prata permitindo revelar a inserção das nanopartículas de prata no interior da argila. A remoção de parte da prata se deveu a espécie Ag(I) fracamente adsorvida nas regiões interlamelares, nos instantes iniciais do processo, e sem acesso a luz UV. A fração retida, 99,115%, permaneceu como Ag metálica. Palavras-chave: água; argila; nanocompósito argila-prática; prata; purificação.
Anais do IV Congresso Online Nacional de Química - IV CONDEQUI
Estudo espectro electroquimico de sistemas estructurados argila-corante
Eclética Química, 2003
A experimentação em química facilitando o entendimento do cotidiano
Estudo eletroquímico de sistemas estruturados argila-corante
Aplicação da SWVads sobre eletrodo AgSIE
O acido folico (AF) e uma vitamina hidrossoluvel do complexo B, pertencente ao grupo dos folatos,... more O acido folico (AF) e uma vitamina hidrossoluvel do complexo B, pertencente ao grupo dos folatos, conhecida como vitamina B9, folacina ou acido pteroilglutâmico. E a forma mais estavel dentre os folatos, sendo a escolhida para o enriquecimento de alimentos. O AF auxilia na prevencao de malformacoes do cerebro, da medula ossea, na diminuicao de homocisteina e na producao da serotonina no organismo. Assim, a complementacao da dieta diaria com o AF se faz necessaria uma vez que, o consumo diario deve ser da ordem de 0,2 mg (para gestante:0,4 mg). No Brasil, a obrigatoriedade do enriquecimento e aplicada a farinhas de trigo e de milho, segundo a RDC no 344 (ANVISA, MS, 2002).
A busca da qualidade no ensino de química e suas relações com as questões ambientais na produção do conhecimento
Universidade Estadual Paulista (UNESP), Departamento de Quimica e Ciencias Ambientais, Instituto ... more Universidade Estadual Paulista (UNESP), Departamento de Quimica e Ciencias Ambientais, Instituto de Biociencias, Letras e Ciencias Exatas de Sao Jose do Rio Preto
Aplicação de eletrodo sólido com filme intermetálico ag-hg, para a determinação de sucos de frutas in natura e industrializados
neste trabalho desenvolveu-se um metodo eletroanalitico em superficie de eletrodo solido com film... more neste trabalho desenvolveu-se um metodo eletroanalitico em superficie de eletrodo solido com filme intermetalico Ag2Hg3,02 (AgSIE), para a determinacao do acido folico (FA).
Low-cost Gent type sampler constructed for urban atmospheric aerosol sampling
Environmental Science and Pollution Research, 2021
The importance of studying the atmospheric pollution due to its effects on human health and other... more The importance of studying the atmospheric pollution due to its effects on human health and other ecosystems, the inexistence of national production of equipment for air sample collection, and the high cost of the imported equipment (especially in developing countries) led the authors of the present work to construct a low-cost Gent type sampler. The construction of the sampler was carried out by combining low-cost materials with good mechanical strength (such as nylon 6.0), hydraulic piping PVC, and the use of a 3D printer. The innovation of the present work is the employment of a 3D printer using ABS polymer to create the grids that cannot be machined. In addition to the sampler, the system is composed of a vacuum pump, a gas meter, and a rotameter. The total cost of the sampling system amounted at about 1200 USD, and the cost of the manufactured Gent type sampler did not reach 100 USD. The results obtained while using this set for sampling atmospheric aerosol for a period of 11 months were compared with the mass concentration of PM10 obtained from the official environmental company, CETESB of São Paulo State, Brazil, showing good correlation with those from CETESB — which confirmed its effectiveness and suitability for use. The low cost, easy operation, and versatility of the built Gent type sampler enable its use for scientific and academic purposes. The equipment can be useful in environmental monitoring networks, in low-income regions, and as an instrument for environmental education used in universities.
Environmental Science and Pollution Research, 2021
To access the sources of air pollutants is crucial to control atmospheric pollution in urban area... more To access the sources of air pollutants is crucial to control atmospheric pollution in urban areas, minimizing human exposure. Particulate matter is a pollutant of great concern making its chemical and morpho-structural characterization of enormous importance. The present work aims at the characterization of atmospheric PM 10 and PM 2.5 . Data of the aerosol mass concentration was correlated by multivariate analysis with water-soluble ion fraction composition accessed by ion chromatography (IC), as well as with meteorological information and air mass backward trajectories. The gravimetric analysis presented average values 3 to 4 times higher than the guide values recommended by the World Health Organization (WHO). A morpho-structural analysis by SEM/FEG coupled to EDS was also carried out identifying the coarse fraction elements from minerals and from soil resuspension organic spherical particles that originated from combustion processes as well as Ti, associated with long-distance transportation. In the fine fraction, Zn with origin probably in tires and vehicle brakes was found. These origins were confirmed by the air masses' backward trajectories obtained by the HYSPLIT model (NOAA). This study contributes to a better understanding of the complex composition of the particulate material in the atmosphere of Araraquara City, resulting from the combination of local and long-distance sources, and serves as a basis for the comparison with future studies related to the air quality at this and other regions in Brazil and in the world.
Journal of Thermal Analysis and Calorimetry, 2020
The aim of this work is to synthesize and characterize a new structured silver-clay dried, calcin... more The aim of this work is to synthesize and characterize a new structured silver-clay dried, calcined or sintered at different temperatures composite by TG-DTA analysis, FTIR spectrometry analysis, XRD and Rietveld refinement, WD-XRF spectrometry, FEG-SEM images and EDS chemical analysis and to evaluate the antibacterial capacity of the new composite by the diffusion disk test against E. coli strains to attend water potability parameters. TG-DTA curves of Bco_dried suggested the presence of kaolinite, muscovite and hydrotalcite by the different events of structural water loss at different atmospheres. The interaction of Ag-clay might have occurred with hydrotalcite as can be inferred by the disappearance of the event at 408.9 °C (N 2 ) and 433.4 °C (air). FTIR spectra showed that the modification occurred because of the changes that can be observed in the band range of (750 ≤ ν ≤ 1350) cm -1 for inner -OH and Si-O bonds. The Bco_dried composition was quantified by XRD and Rietveld refinement, and crystalline phases are quartz, calcite, kaolinite, hydrotalcite, muscovite, and portlandite. After sintering, the material presented the formation of new crystalline phases, due to the loss of structural water. When modified, the sample had no characteristic peaks of hydrotalcite, suggesting an interaction with Ag species. The compositions estimated for all samples by WD-XRF are mostly of Si, Al, Ca, K, Mg, Fe, Ti, and Ag. After modification, Ag increased significantly for Pca4_dried and Pca4_sint. SEM images presented the hexagonal characteristic of layered clay material and showed the interaction with Ag added. The susceptibility test showed that Pca4_dried has an antibacterial capacity against E. coli JM107 strains. Electronic supplementary material The online version of this article ( 3-020-09267 -w) contains supplementary material, which is available to authorized users.
Portugaliae Electrochimica Acta, 2003
Cyclic voltammetry and controlled potential electrolysis, and other analytical techniques were us... more Cyclic voltammetry and controlled potential electrolysis, and other analytical techniques were used to study the reactions of mercury with iridium oxides formed by repetitive cyclic voltammetry (RCV) or by controlled potential electrolysis (CPE) on pure iridium substrate. The oxides were formed in a Hg(I)-containing solution. The SEM images, XPS spectra and CV obtained after the RCV treatment showed a more attacked surface with less mercury on the Ir. On the contrary, the SEM images, XPS spectra and the CV for the electrode prepared by CPE indicated a less attacked surface with more Hg. The oxides formed when the CPE condition was applied inhibited the UPD of mercury.
Electrodeposited thin mercury films on Pt–Ir alloy electrodes
Thin Solid Films, 1999
Mercury thin films prepared by electrochemical deposition on Pt–Ir alloy and after partial removi... more Mercury thin films prepared by electrochemical deposition on Pt–Ir alloy and after partial removing of mercury at different temperatures were studied by means of an interferometric surface mapping microscope and by X-ray photoelectronic spectroscopy. Mercury film samples having mercury partially removed by anodic stripping at a potential more positive than the corresponding peak in the voltammogram were also studied using
Thermogravimetry (TG) applied to the study of the reaction of mercury with platinum–rhodium alloy
Thermochimica Acta, 2002
Thermogravimetry (TG) energy dispersive X-ray microanalysis (EDX), scanning electron microscopy (... more Thermogravimetry (TG) energy dispersive X-ray microanalysis (EDX), scanning electron microscopy (SEM), mapping surface, X-ray diffraction (XRD), inductively coupled plasma emission spectroscopy and atomic spectroscopy with cold vapor generation have been used to study the reaction of mercury with platinum–rhodium (Pt–Rh) alloy. The results suggest that, the electrodeposited Hg film reacts with Pt–Rh to form intermetallic compounds of different stability, when heated indicated by at least four weight loss steps. Intermetallic compounds as PtHg4 and PtHg2 was characterized by XRD. These intermetallic compound are the main product presents on the surface of the samples after remotion of the bulk mercury via thermal desorption techniques.
Thermochimica Acta, 2013
Thermogravimetry (TG), energy dispersive X-ray microanalysis (EDX), scanning electron microscopy ... more Thermogravimetry (TG), energy dispersive X-ray microanalysis (EDX), scanning electron microscopy (SEM), mapping surface and X-ray diffraction (XRD) were used for the study of solid-state reaction on Pt-15%Rh with electrodeposited mercury. The results suggest when heated the mercury film react with the Pt-15%Rh alloy to form intermetallics having different thermal stabilities indicated by three mass loss steps. The first mass loss step occurs between room temperature and 184 • C only the bulk Hg is removed and PtHg 4 , PtHg 2 and RhHg 2 were characterized by XRD. The second step, between 184 and 271 • C, was attributed to PtHg 4 decomposition with formation of PtHg 2 stabilized by RhHg 2 . The third step, between 271 and 340 • C, was attributed to decomposition of a solid-solution of PtHg 2 /RhHg 2 . The fourth step, between 340 and 600 • C, was ascribed to: (1) a thermal decomposition of PtHg 2 , formed by a PtHg eutectoid reaction (∼340 • C) on the surface and (2) Hg removal from a solid solution of Pt-15%Rh(Hg).
Journal of Thermal Analysis and Calorimetry, 2008
Glutelin, the major protein fraction from guava seed, was obtained by fractioning as described by... more Glutelin, the major protein fraction from guava seed, was obtained by fractioning as described by Osborne. The total proteins were extracted and the isolates obtained by isoelectric precipitation presented similar DSC curves, concordant with the results obtained by gel filtration chromatography and electrophoresis in polyacrylamide gel (PAGE-SDS). However, the DSC curves showed a higher enthalpy with regard to the denaturing protein isolate (PI) extracted at pH 10.0 when compared to a PI at pH 11.5. Such results are in accordance with those obtained for PI extracted at pH 10.0 using chromatography, this one being present in the form of molecular aggregates of greater molecular mass. The glutelin fraction, however, did not present a denaturation peak in the DSC curve, showing that the process for obtaining the same significantly altered its conformation.
Thermal studies of solid 2-methoxybenzylidenepyruvate of lighter trivalent lanthanides
Journal of Thermal Analysis and Calorimetry, 2005
ABSTRACT Thermal behavior studies on complexes [Italic>Ln(cis-DTSO2)4(H2O)2](pic)3 (Italic... more ABSTRACT Thermal behavior studies on complexes [Italic>Ln(cis-DTSO2)4(H2O)2](pic)3 (Italic>Ln=Pr-Lu, Y; Italic>cis-DTSO2=Italic>cis-1,3-dithiane-1,3-dioxide and Italic>pic=picrate) were done by TG/DTG and DSC analysis. The volatiles liberated from thermal decomposition were separated by chromatographic packed column (Tenax 60-80 mesh) and detected by mass spectrometry using TG/DTA-GC/MS combined analytical technique. The retention times of volatile products liberated in the chromatographic column were 4.25 min for SO2 and 21.05 min for methyl-propyl-sulfoxide.
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Papers by Fernando Luis Fertonani