A5005226171- Analytical chemistry methods development
- Electrochemical Analysis and Applications
- Heavy metals in environment
- Petroleum Processing and Analysis
- Mercury impact and mitigation studies
- Water Quality and Pollution Assessment
- Geochemistry and Geologic Mapping
- Advanced Chemical Sensor Technologies
- Pesticide Residue Analysis and Safety
- Biodiesel Production and Applications
- Nuclear Physics and Applications
- Analytical Chemistry and Chromatography
- Analytical Chemistry and Sensors
- Environmental Toxicology and Ecotoxicology
- Mass Spectrometry Techniques and Applications
- Radioactive element chemistry and processing
- Banana Cultivation and Research
- Heavy Metals in Plants
- Geography and Environmental Studies
- Food Chemistry and Fat Analysis
- Extraction and Separation Processes
- Heavy Metal Exposure and Toxicity
- Arsenic contamination and mitigation
- Recycling and Waste Management Techniques
- Toxic Organic Pollutants Impact
Universidade Federal do Espírito Santo
2015-2024
Rede de Química e Tecnologia
2020
Ridge Lea Hospital
2015
Pontifical Catholic University of Rio de Janeiro
2005-2009
Pontifícia Universidade Católica de São Paulo
2006
Catholic University of America
2006
This study proposes a procedure for determining sodium, potassium, calcium and magnesium in biodiesel samples by flame atomic absorption spectrometry (F AAS). The sample was prepared as microemulsion without surfactant. optimized composition of the 10% (w/v) biodiesel, 75% (v/v) n-propanol, 1% concentrated nitric acid 14% aqueous solution formed 0.2% 0.5% ionization suppressor. Analyte signals were found to be stable period 15 days. Analytical curves obtained using organometallic standard...
Of the salts present in crude oil, sodium, calcium, magnesium, strontium and iron chlorides are most abundant considered main cause of corrosion oil refineries. Therefore, objective this study was to quantify chloride counterions (Na, Ca, Mg, Sr Fe) using inductively coupled plasma-optical emission spectrometry (ICP-OES) after hot solvent extraction (modified ASTM D 6470-99). The procedure developed work allowed samples with different °API values (17.4–30.2) originating from post-salt be...
The selection of the sample preparation method is one most critical steps in determination metals using atomic spectrometry techniques. aim this paper was to propose use a novel strategy for crude oil preparation, based on extraction induced by emulsion breaking, prior Ba, Ca, Mg and Na inductively coupled plasma optical emission (ICP OES). emulsions were prepared mixing oils samples diluted xylene with 5% m/v Triton X-100 solution 10% v/v HNO3. breaking performed heating at 80 ± 2 °C...
The presence of Ca, Mg, Sr and Ba in crude oil samples should be controlled, since they can lead to incrustations on steel pipes, valves, pumps other equipment used drilling. This paper proposes procedures for the determination these metals by atomic absorption spectrometry, using formation O/W emulsions sample preparation. Emulsions were prepared 0.2% v/v HNO3 Triton X-100 as a surfactant showed good stability four studied analytes at least 5 days after Flame spectrometry (FAAS) was Mg...
A procedure for the direct determination of P in biodiesel samples by graphite furnace atomic absorption spectrometry (GF AAS) using an automatic solid sampling accessory without any sample pre-treatment or dilution is proposed. Studies showed that it necessary to use a chemical modifier and Pd Triton X-100 solution best results. The pyrolysis atomization temperatures (1300 °C 2700 °C, respectively), as well mass (30 µg) were determined multivariate optimization. other parameters temperature...
Crude oil produced water characterization is important because its disposal or reuse difficult: environmental impacts (high salinity and toxic components) risk of obstruction on the production columns (crust formation).
Diesel oil can be a source of contamination in aquatic environments, mainly as result spills. The effects the water-soluble fraction diesel (WSF) on Prochilodus vimboideswere assessed. Fish were exposed to three different WSF dilutions for up 96 h and compared control group. Damages fragments DNA analyzed using Comet assay. presence erytrocyts abnormalities was assessed by micronucleus test. Aspartate aminotransferase (AST) alanine (ALT) activity accumulation copper gills also analyzed. had...
Three experiments were designed to assess the accumulation and acute toxicity of copper (Cu) in juvenile fat snook Centropomusparallelus. The first experiment was performed determine 96-h lethal concentration (LC50) Cu. second effects sublethal concentrations Cu (0.47 0.94 mg/L), while third one allowed us test recovery capacity fish exposed kept sea water without addition. LC50value for found be 1.88 mg/L Fish showed a significant gills at 96 h respect control ones (0.43 µg/g Cu). No...