A5081855701- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric chemistry and aerosols
- Indoor Air Quality and Microbial Exposure
- Water Quality and Pollution Assessment
- Odor and Emission Control Technologies
- Chemical Safety and Risk Management
- Atmospheric Ozone and Climate
- Chemistry and Chemical Engineering
- Atmospheric aerosols and clouds
- Carcinogens and Genotoxicity Assessment
- Vehicle emissions and performance
- Advanced Chemical Sensor Technologies
- Water Quality Monitoring and Analysis
- Geography and Environmental Studies
Universidade Federal da Bahia
2005-2023
Traditionally the monitoring of atmospheric pollutants is aimed at managing accidents and short-term actions for protection human health on local regional scales. These networks required continuous measurements with high time resolution, involving costly equipment, operation maintenance. More recent simulations mathematical models scenario-building regional, continental global scales, as well studies environmental personal exposure are demanding three main types design, where need special...
Gas stations are important emissions source of benzene (C6H6), toluene (C7H8), ethylbenzene (C8H10), and ortho, meta para-xylene (C8H10)—better known by the acronym BTEX. The objective this study was to determine concentrations BTEX compounds in ambient air ten gas cities Salvador Feira de Santana, Bahia, Brazil evaluate health risks workers. Passive samplers diffusive Radiello?, containing activated carbon as adsorbent, were used. exposed for 8 h then analytes recovered chemical desorption...
Air pollution affects the health of population in a number ways. In 2015, it was responsible for 6.4 million deaths worldwide. Among aldehydes present atmosphere, formaldehyde (HCHO) and acetaldehyde (CH3CHO) are most abundant ones they considered carcinogenic probably to humans, respectively. The objective this work correlate concentrations HCHO CH3CHO urban areas city Salvador, northeast Brazil, with levels conventional pollutants meteorological parameters, calculate risks atmospheric...
The performance of a passive sampler was tested under exposure in Teflon chamber. SO2 trapped impregnated filter with 1.0 x 10-2 mol L-1 Na2CO3 solution extracted ultrasound bath H2O2 for 15 min and determined as SO4(2-) by ion chromatography. presented good except air total stillness condition (0 m s-1), very short periods (0.5 h), atmosphere O3 > 150 mug m-3 high concentrations reduced sulfur compounds. relative humidity the (20 - 80%) to zero concentration did not affect performance. It...
Reduced sulfur compounds, RSCs (H2S, COS, CH3SH, CH3SCH3, CS2 and CH3S2CH3) play a role in global cycle acid rain formation. At trace levels air are difficult to collect, store analyze because of their highly adsorptive reactive properties. This work optimizes parameters sampling instrumental determination for urban measurements. The method used is based on cryogenic gas chromatography provided with cryofocusing trap flame photometric detection. Greater efficiency was obtained liquid argon...
Different fuels are used in Brazil and there is little knowledge about the presence of organic inorganic acids atmosphere Brazilian cities. HNO 3 , HCl, HCOOH CH COOH were sampled gas phase using passive samplers thermodiffusion system, which H 2 SO 4 particulate was also sampled, five sites Salvador.Ion chromatography analyses showed that measured contributed on average with 89 11%, respectively, to acidity city's atmosphere.The strong correlations between HCOOH, HCl CO NO indicated a...
To show the risks and harm caused by occupational exposure to benzene, toluene, ethylbenzene xylenes compounds (BTEX), working conditions of 113 persons employed at gas stations in cities Riach?o do Jacuipe, Feira de Santana Salvador state Bahia, Brazil were investigated experts who correlated protection measures required law those applied workers. Data collection was performed help a questionnaire non-participant observation record. The age groups workers three surveyed between 18 25 years...
Formaldehyde (FA) and acetaldehyde (AA) were determined in the ambient air of five gas stations (GS) city Salvador, Bahia State, Brazil, using three passive samplers exposed simultaneously for 8 h analysis by high-performance liquid chromatography-ultraviolet detection (HPLC-UV).The concentration ranges found 3.31-5.78μg m -3 FA 10.5-28.2μg AA.These values below exposure limits recommended national international agencies occupational environments, however, concentrations above more...
ATMOSPHERIC REDUCED SULPHUR COMPOUNDS.This work presents a review of sampling and analytical methods that can be applied to atmospheric traces reduced sulphur compounds (RSC) in the atmosphere.Sampling methodology involving discontinuous with preconcentration is mostly used.For most part, adsorption on solids cryogenic capture are as procedure.The analysis these has been done mainly by gas chromatography FPD, fluorescence spectrophotometry.Advantages disadvantages methodologies also...
UNDERGRADUATE STUDENTS.This study is a result of undergraduate student participation in the Environmental Chemistry discipline provided by Institute/UFBA.The students were involved development passive samplers, project LAQUAM (Environmental Analytical Laboratory).The students' residences and other neighborhoods used to create sampling network, allowing measurement atmospheric levels pollutants urban areas those under industrial influence.The assembly including impregnation filters chemical...
The sea spray can be transported to long distances, reaching the semiarid regions.In this work, rainwater and atmospheric particulate matter were characterized by investigating presence of in atmosphere region Bahia, Brazil, aiming study influence its transport on salinization waters region.Stable isotopes deuterium oxygen-18 also determined rain as environmental tracers, evaluating isotopic ratios 18 O/ 16 O D/H.The suffers marine influence, well resuspended soil particles anthropogenic...
Studies of chemical speciation and phase fractionation atmospheric inorganic compounds N, S Cl have been undertaken in the atmosphere Reconcavo Baiano. The objectives were to determine enrichment clean air masses coming from Atlantic by different species resulting NO2 SO2, HCl NH3 emissions industrial areas at estimate changes quality regarding between 2008 2010. following sampling devices used: passive samplers (PS) continuous analyzers for SO2; diffusion tubes coated with citric acid...