A5056084985- Analytical chemistry methods development
- Heavy metals in environment
- Electrochemical Analysis and Applications
- Pesticide Residue Analysis and Safety
- Environmental Toxicology and Ecotoxicology
- Mercury impact and mitigation studies
- Selenium in Biological Systems
- Pharmaceutical and Antibiotic Environmental Impacts
- Advanced Chemical Sensor Technologies
- Radioactive element chemistry and processing
- Fish Biology and Ecology Studies
- Heavy Metal Exposure and Toxicity
- Heavy Metals in Plants
- Biodiesel Production and Applications
- Microplastics and Plastic Pollution
- Marine Biology and Environmental Chemistry
- Nanoparticle-Based Drug Delivery
- Geochemistry and Elemental Analysis
- Algal biology and biofuel production
- Chromium effects and bioremediation
- Protein Interaction Studies and Fluorescence Analysis
- Marine Biology and Ecology Research
- Moringa oleifera research and applications
- Seaweed-derived Bioactive Compounds
- Analytical Chemistry and Chromatography
Universidade Federal do Rio Grande
2012-2024
Universidade Federal do Rio Grande do Sul
2013-2022
Brazilian National Association of Graduate Programs in Communication
2014
A DLLME method for extraction and preconcentration of Cd Pb from soft drinks further determination by GF AAS was developed. Important parameters such as the type volume dispersive solvents, concentration DDTC (complexing agent) pH were evaluated. Better results obtained using 500 μL acetone 700 acetonitrile 60 CCl4 solvent both analytes 1.5% solution. Accuracy evaluated recovery assays ranged 91 to 113% 95 108% Pb, with RSD below 10 7%, respectively. The LODs 0.006 0.072 ng L−1 optimized...
This paper reports, for the first time, development of an analytical method employing modified matrix solid-phase dispersion (MSPD) extraction CH3Hg(+) and Hg(2+) species from fish samples. Separation determination mercury were performed by gas chromatography coupled to mass spectrometry (GC/MS). Important MSPD parameters, such as sample mass, type solid support, concentration solution (HCl NaCl), stirring investigated response surface methodology. The derivatization step separation also...
Atualmente as nações industrializadas se deparam com um novo problema, a contaminação das águas por contaminantes emergentes, entre eles fármacos e produtos de cuidado pessoal (PPCPs).Neste trabalho, método analítico empregando extração em fase sólida (SPE) cromatografia líquida fonte ionização eletrospray acoplada espectrometria massas série foi desenvolvido validado para determinação nimesulida, amitriptilina, enalapril, glibenclamida, haloperidol metilparabeno amostras água.O estudo da...
This paper reports the development of a method simultaneous determination iron and nickel in fluoropolymers by high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) with direct solid sampling. In order to carry out measurements, both main resonance line (232.003nm) adjacent secondary (232.036nm) were monitored same spectral window. The proposed was optimized perfluoroalkoxy (PFA) sample applied fluorinated ethylene propylene (FEP) modified...
This work reports, for the first time, determination of major and trace elements (Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, La, Mg, Mn, Mo, Na, Ni, P, Pb, S, Se, Sn, Sr, Ti, Tl, U, V, Zn) in fractions synthesis fatty acid methyl esters (FAMEs). These include fresh microalgae, residual biomass, lipid fraction, crude FAMEs, insoluble fraction purified FAMEs from microalgae Chlorella sp. A microwave-assisted digestion procedure closed vessels was applied sample subsequent element by inductively...
This work reports the development of a dispersive liquid – microextraction method for simultaneous extraction, preconcentration, and derivatization H g 2+ CH 3 + species from water samples further determination by GC MS . Some parameters proposed method, such as volume type disperser extraction solvent, N a[ B ( C 6 5 ) 4 ] concentration were investigated using response surface methodology. Suitable recoveries obtained 80 μL 2 l (as solvent), 1000 ethanol 300 2.1 mmol/L derivatizing agent)....
In this study, a simple, rapid and sensitive analytical method for the detection of TCS from<italic>Poecilia vivipara</italic>tissues (muscle, gills, brain, liver, gonads whole fish) was developed.
This work reports the development of a method for Fe extraction in white and red wines using dispersive liquid–liquid microextraction (DLLME) determination by ultraviolet–visible spectrophotometry. For optimization DLLME method, following parameters were evaluated: type volume (1300 μL acetonitrile) (80 C2Cl4) solvents, pH (3.0), concentration ammonium pyrrolidinedithiocarbamate (APDC, 500 1% m/v APDC solution), NaCl (not added), time. The calibration curve was performed analyte addition...
A simple, rapid, efficient, and environmentally friendly method was developed for the preconcentration of atrazine, simazine, diuron, bentazone, tebuconazole, fipronil from water. Dispersive liquid–liquid microextraction employed with determination by liquid chromatography–tandem mass spectrometry. The volumes extraction disperser solvents, concentration sodium chloride, pH were optimized response surface methodology. optimum conditions involved use 150 µL 1:1 (v/v)...
A new, efficient, fast and simple method for iron determination in environmental water samples with different salinities by a dispersive liquid–liquid microextraction method, followed UV-Vis spectrophotometric determination, was developed. In this study, Fe complexed ammonium pyrrolidinedithiocarbamate extracted into 1,2-dichlorobenzene droplets after the injection of mixture composed (extraction solvent) ethanol (dispersive sample solution. Factors which affected efficiency extraction its...
Major and trace element content was determined in golden mussel (Limnoperna fortunei) collected the São Gonçalo Channel (Rio Grande City, Brazil). A microwave-assisted digestion procedure closed vessels applied to decomposition subsequent determination of elements by spectrometric techniques. Results showed that tissue contains Ag, Al, As, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, Hg, Li, Mg, Mn, Mo, P, Pb, S, Sn, Sr, Ti, V Zn, while same (except Ag Hg) were quantified its shell, demonstrating...