A5074053486- Analytical chemistry methods development
- Heavy Metal Exposure and Toxicity
- Heavy metals in environment
- Radioactive element chemistry and processing
- Electrochemical Analysis and Applications
- Mercury impact and mitigation studies
- Mass Spectrometry Techniques and Applications
- Arsenic contamination and mitigation
- Petroleum Processing and Analysis
- Trace Elements in Health
- Pesticide Residue Analysis and Safety
- Coal and Its By-products
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Chromatography
- Minerals Flotation and Separation Techniques
- Heavy Metals in Plants
- Extraction and Separation Processes
- Plant Micronutrient Interactions and Effects
- Advanced Chemical Sensor Technologies
- Proteins in Food Systems
- Trypanosoma species research and implications
- Selenium in Biological Systems
- Toxic Organic Pollutants Impact
- Electrolyte and hormonal disorders
- Enzyme Catalysis and Immobilization
Universidade Federal do Rio Grande do Sul
2012-2022
Czech Academy of Sciences, Institute of Analytical Chemistry
2011-2012
Universidade Federal de Santa Maria
2006-2011
Universidade Federal de São Carlos
2010
Universidade Federal de Pelotas
2010
Universidade Federal da Bahia
2010
Graz University of Technology
2008
Sample preparation methods for cereal digestion were evaluated the first time subsequent As, Cd, Hg, and Pb determination by atomic absorption spectroscopy techniques. Microwave-assisted (MW-AD) under high medium pressure microwave-induced combustion (MIC) evaluated. The use of MIC made it possible to digest 700 mg samples, agreements 97, 96, 100 92% obtained Hg Pb, respectively, when 7 mol L−1 HNO3 was used as absorbing solution. It not necessary dilute digests avoid interferences in...
The microwave-induced combustion (MIC) technique was applied for coal digestion and further determination of bromide, chloride, fluoride, iodide by ion chromatography (IC). Samples (up to 500 mg) were combusted at 2 MPa oxygen. Combustion complete in less than 50 s, analytes absorbed water or (NH4)2CO3 solution. A reflux step improve analyte absorption. Accuracy evaluated Br, Cl, F using certified reference spiked samples I. For F, the agreement between 96 103% mmol L-1 as absorbing solution...
In this work, sample preparation methods for polymer digestion based on microwave-induced combustion (MIC) and microwave-assisted acid (MW-AD) were evaluated further As, Bi, Cd, Co, Cu, Hg, Mn, Mo, Ni, Pb, Sb, Sr, Ti, V Zn determination by inductively coupled plasma mass spectrometry (ICPMS) optical emission (ICPOES). Samples of low density polyethylene (LDPE), high (HDPE), polypropylene (PP), polystyrene (PS), terephthalate (PET, colorless green), polyetheretherketone (PEEK) nylon 6,6...
A simple one-step method based on the sputtering deposition of Ni nanoparticles (NP) has been developed for production magnetic biocatalysts, avoiding complications and drawbacks methods chemical functionalisation or coating NP. This new technique provided high levels recovery, reusability catalytic activity lipase–Ni biocatalyst.
Microwave-induced combustion (MIC) was applied for digestion of crude oil distillation residues further total nickel, vanadium and sulfur determination by inductively coupled plasma optical emission spectrometry (ICP OES). Sample masses up to 500 mg atmospheric residue (AR) vacuum (VR) were completely combusted using the MIC system. A polyethylene film used wrap samples allowing a feasible process. Ammonium nitrate (6 mol l−1 solution, 50 µl) as an aid ignition. Parameters related process,...
Inorganic arsenic (iAs) is very toxic. iAs in rice was determined using selective hydride generation conditions and atomic absorption spectrometry.
Introdução: As facetas diretas em resina composta são uma alternativa estética conservadora e acessível na odontologia restauradora. No entanto, diversos fatores influenciam sua longevidade, como seleção de materiais, técnica adesão hábitos do paciente. Metodologia: Foi realizada revisão bibliográfica sobre os principais aspectos que comprometem a durabilidade das composta. A pesquisa incluiu artigos abordam materiais restauradores, protocolos adesivos influências biológicas. Os estudos...
A procedure for sample digestion based on focused microwave-induced combustion (FMIC) is proposed. This system was developed using a commercial microwave oven with lab-made quartz holder and modified glass vessel. Oxygen flow used to start support the combustion. botanical evaluate operational conditions further Al, Ba, Ca, Fe, Mg, Mn, Sr, Zn determination by inductively coupled plasma optical emission spectrometry. Pelletized samples were positioned holder, 50 μL of 6 mol L−1 NH4NO3...
The microwave-induced combustion (MIC) was applied for cigarette tobacco samples digestion and further determination of bromine chlorine by inductively coupled plasma optical emission spectrometry (ICP OES). Samples masses up to 500 mg were combusted in closed vessels using 20 bar oxygen. Combustion complete less than 30 s analytes absorbed diluted (NH4)2CO3 solution. Accuracy evaluated certified reference materials with similar matrix composition comparison results obtained ICP-MS....
Growing evidence suggest that the methylated trivalent metabolites of inorganic arsenic (iAs), methylarsonite (MAs(III)) and dimethylarsinite (DMAs(III)), contribute to adverse effects iAs exposure. However, lack suitable methods has hindered quantitative analysis MAs(III) DMAs(III) in complex biological matrices. Here, we show hydride generation-cryotrapping-atomic absorption spectrometry can quantify both livers mice exposed iAs. No sample extraction is required, thus limiting or oxidation...
A procedure for salt extraction of heavy crude oil emulsions (API lower than 14°) was performed using microwave radiation. Emulsion transferred to high-pressure quartz vessels with further water addition. Microwave radiation applied 60 min, and after separation phases, chloride determination in the phase by ion chromatography (IC). The sampling procedure, heating time (10−40 min), power (500−800 W), number extractions (1−5) were evaluated. remaining determined, as chloride, IC sample...
Concentration levels of As, Cd, Hg, Pb, Tl, Sn, Sb Co, Cu, Mn, Se, Zn, Cr, Ni and Mo in different types rice cultivated irrigated fields Brazil were evaluated. Arsenic, Mn Cu found higher concentrations brown samples, suggesting the prevalence these elements bran. Meanwhile, lower Mo, Se Co parboiled rice. Organic did not differ conventionally Thallium, Hg detected any sample whose limits detection 0.7 μg kg(-1), 2.5 kg(-1) 8 respectively. The investigated compared with those reported for...
The aim of this study was to optimize a sample preparation method for rice and wheat using microwave-assisted ultraviolet digestion (MW-UV) subsequent determination toxic elements. Cadmium Pb were determined by sector-field inductively coupled plasma mass spectrometry (SF-ICP-MS), while As Hg chemical vapor generation atomic absorption (CVG-AAS). A systematic evaluation the microwave heating program, nitric acid concentrationand performed MW-UV samples. relationship between concentration...