The aim of the present study is to identify and quantify the main sources of polycyclic aromatic ... more The aim of the present study is to identify and quantify the main sources of polycyclic aromatic hydrocarbons (PAHs) associated with aerosols (PM10) collected at three different sampling stations: 8° Distrito, CEASA and Charqueadas. The samples were collected between November 2001 and November 2002, and the concentrations of 16 major PAHs were determined according to EPA. The filters containing particulate matter were extracted with dichloromethane in Soxhlet and the extracts were later analysed in a gaseous chromatograph coupled to a mass spectrometer (GS/MS). The average concentrations of PAHs ranged between 0.04 and 2.30ngm−3. The analysis of principal components was applied to the chemical and meteorological variables in order to facilitate the identification of sources of PAHs emission into the atmospheric particulate. The study identified the following sources of PAHs: vehicular emissions, such as diesel oil, petrol, alcohol, and kerosene; industrial emissions, like lubricating oils; emissions from hospital waste burning, and coal burning at power plants.
O presente trabalho teve como objetivo estudar a formação e a dispersão de ozônio, aplicando o mo... more O presente trabalho teve como objetivo estudar a formação e a dispersão de ozônio, aplicando o modelo fotoquímico CIT, na Região de Candiota onde se encontra instalado o maior complexo termelétrico do Sul do país. Os campos meteorológicos necessários para a inicialização do modelo CIT foram obtidos através das simulações atmosféricas com o modelo RAMS (Regional Atmosferic Modeling System). Para a realização deste estudo foi construído um inventário de emissões de acordo com os fatores de emissão da AP- 42, EPA, considerando apenas compostos emitidos na queima do carvão. Como condições iniciais e de contorno do modelo fotoquímico foram utilizados os dados de qualidade do ar de SO2, NO2 e NO, obtidos das estações de monitoramento automático da região. As simulações fotoquímicas foram realizadas em uma grade computacional composta de 60 pontos em x e 30 pontos em y, com resolução de 5 km, centrada nas coordenadas da UTPM, em Candiota. Os períodos analisados neste trabalho compreenderam...
RESUMO: (Percepção Ambiental da Comunidade Escolar Municipal sobre a Floresta Nacional de Canela,... more RESUMO: (Percepção Ambiental da Comunidade Escolar Municipal sobre a Floresta Nacional de Canela, RS). A Floresta Nacional de Canela (FLONA/Canela) está localizada próxima aos centros urbanos de Canela e Gramado. A efetividade dessa e de outras UCs, a longo ...
The National Forest of Canela (FLONA/Canela) is located nearby the urban centers of Canela and Gr... more The National Forest of Canela (FLONA/Canela) is located nearby the urban centers of Canela and Gramado. The long term effectively of this protected area will only be possible when the neighboring population considers it as an important area, which also applies to other protected areas. The aim of this work was to check the environmental perception of the school community in three City Primary Schools of Canela/RS, located in the surroundings of the National Forest. The survey used a total of 234 questionnaires answered by students. The schools were chosen according to their location in relation to FLONA, being 400 m, 3 km and 5 km far from it. The data evaluation was quantitative concerning the one-choice questions and qualitative concerning the multiple-choice or open questions. This analysis suggested that the people from the farthest schools from FLONA show lesser awareness to environmental questions, do not judge the protected area very useful to environmental preservation and d...
O objetivo deste estudo é analisar a composição química da precipitação úmida em amostras coletad... more O objetivo deste estudo é analisar a composição química da precipitação úmida em amostras coletadas em três estações na região de Candiota no Estado do Rio Grande do Sul (RS) Brasil. Amostras foram...
The purpose of this study was to biomonitor metropolitan areas of Porto Alegre (Brazil) for PAHs ... more The purpose of this study was to biomonitor metropolitan areas of Porto Alegre (Brazil) for PAHs associated with atmospheric particles and check their effects on the DNA of the land mollusk Helix aspersa. The sampling sites are located in an urban area with heavy traffic: (i) Canoas, (ii) Sapucaia do Sul, and (iii) FIERGS/Porto Alegre. The samples were collected during a continuous period of 24 hours during 15 days using Stacked Filter Units (SFU) on polycarbonate filters (two separated size fractions: PM10–2.5 and PM<2.5). The concentrations of 16 major PAHs were determined according to EPA. Comet assay on H. aspersa hemolymph cells was chosen for genotoxicity evaluation. This evaluation shows that, in general, the smaller PM-size fractions (PM<2.5) have the highest genotoxicity and contain higher concentrations of extractable organic matter. In addition, associations between chemical characteristics and PM carcinogenicity tend to be stronger for the smaller PM-size fractions.
The purpose of this study is to analyze the chemical composition of wet precipitation in samples ... more The purpose of this study is to analyze the chemical composition of wet precipitation in samples collected at three stations in the Candiota region in the Brazilian state of Rio Grande do Sul (RS). Samples were collected in 2004. Variables analyzed in wet precipitation were pH, conductivity, and concentration of Cl, NO3, SO42 F, Na+, Ca2+, Mg2+, K+, NH4+, Cu, Zn, Fe, Mn, Pb, Ni, Cd, Co, and Cr. SO2 and NO2 distribution over the time were also evaluated. Results have showed that pH < 5.6 are found mostly at Candiota airport (85%), followed by Aceguá (72%) and Três Lagoas (65%). Enrichment Factor of the studied ions in wet deposition revealed higher Ca2+ and SO42 enrichment in Três Lagoas. Factor Analysis applied to metals and major ions allowed identifying the major sources. While Cl, Na+, Mg2+ are of marine origin, SO42, NO3, NH4+ ,F come from anthropogenic sources. Except for Fe and Mn originating from the soil dust, the metals studied showed to have anthropogenic influence The average SO2 and NO2 concentration, as well as SO42 and NO3 in wet precipitation in the Candiota region showed higher concentrations during the warmer months.
The purpose of this work is to study the chemical elements and PAHs associated with atmospheric p... more The purpose of this work is to study the chemical elements and PAHs associated with atmospheric particulate in samples of PM10 collected in the Metropolitan Area of Porto Alegre—MAPA, Rio Grande do Sul, Brazil. In addition, to study the chemical elements associated with particles of different fractions of PM10–2.5 and PM2.5 using dichotomous sampling, in urban (MAPA) and rural areas. Two types of samplers were used: HV PM10 and Dichotomous (PM10–2.5 and PM2.5). Samples were collected during 2002 and 2005. The concentration of the elements Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, and Zn was determined by PIXE (Particle-Induced X-ray Emission), while the concentrations of 16 major PAHs were determined according to EPA with a gas chromatograph coupled to a mass spectrometer (GS/MS). Results showed that elements of anthropogenic origin (V, Zn, Cr, Ni, Cu, and S) were mainly associated with the fraction PM2.5, while the soil dust (Si, Al, Ti and Fe) were found mainly on fraction PM10–2.5. In samples of PM10, the most frequent PAHs found were Bgp, Flt, BaA, Chr, B(b + k)F, BaP and Dba. The types of emission and their association with the atmospheric parameters were studied applying the statistical analysis of the principal component method. The main sources found in the area under study were vehicles, industries (steel mills and a coal-fired power station), dust, sea breeze, and burning.
The aim of the present study is to identify and quantify the main sources of polycyclic aromatic ... more The aim of the present study is to identify and quantify the main sources of polycyclic aromatic hydrocarbons (PAHs) associated with aerosols (PM10) collected at three different sampling stations: 8° Distrito, CEASA and Charqueadas. The samples were collected between November 2001 and November 2002, and the concentrations of 16 major PAHs were determined according to EPA. The filters containing particulate matter were extracted with dichloromethane in Soxhlet and the extracts were later analysed in a gaseous chromatograph coupled to a mass spectrometer (GS/MS). The average concentrations of PAHs ranged between 0.04 and 2.30ngm−3. The analysis of principal components was applied to the chemical and meteorological variables in order to facilitate the identification of sources of PAHs emission into the atmospheric particulate. The study identified the following sources of PAHs: vehicular emissions, such as diesel oil, petrol, alcohol, and kerosene; industrial emissions, like lubricating oils; emissions from hospital waste burning, and coal burning at power plants.
O presente trabalho teve como objetivo estudar a formação e a dispersão de ozônio, aplicando o mo... more O presente trabalho teve como objetivo estudar a formação e a dispersão de ozônio, aplicando o modelo fotoquímico CIT, na Região de Candiota onde se encontra instalado o maior complexo termelétrico do Sul do país. Os campos meteorológicos necessários para a inicialização do modelo CIT foram obtidos através das simulações atmosféricas com o modelo RAMS (Regional Atmosferic Modeling System). Para a realização deste estudo foi construído um inventário de emissões de acordo com os fatores de emissão da AP- 42, EPA, considerando apenas compostos emitidos na queima do carvão. Como condições iniciais e de contorno do modelo fotoquímico foram utilizados os dados de qualidade do ar de SO2, NO2 e NO, obtidos das estações de monitoramento automático da região. As simulações fotoquímicas foram realizadas em uma grade computacional composta de 60 pontos em x e 30 pontos em y, com resolução de 5 km, centrada nas coordenadas da UTPM, em Candiota. Os períodos analisados neste trabalho compreenderam...
RESUMO: (Percepção Ambiental da Comunidade Escolar Municipal sobre a Floresta Nacional de Canela,... more RESUMO: (Percepção Ambiental da Comunidade Escolar Municipal sobre a Floresta Nacional de Canela, RS). A Floresta Nacional de Canela (FLONA/Canela) está localizada próxima aos centros urbanos de Canela e Gramado. A efetividade dessa e de outras UCs, a longo ...
The National Forest of Canela (FLONA/Canela) is located nearby the urban centers of Canela and Gr... more The National Forest of Canela (FLONA/Canela) is located nearby the urban centers of Canela and Gramado. The long term effectively of this protected area will only be possible when the neighboring population considers it as an important area, which also applies to other protected areas. The aim of this work was to check the environmental perception of the school community in three City Primary Schools of Canela/RS, located in the surroundings of the National Forest. The survey used a total of 234 questionnaires answered by students. The schools were chosen according to their location in relation to FLONA, being 400 m, 3 km and 5 km far from it. The data evaluation was quantitative concerning the one-choice questions and qualitative concerning the multiple-choice or open questions. This analysis suggested that the people from the farthest schools from FLONA show lesser awareness to environmental questions, do not judge the protected area very useful to environmental preservation and d...
O objetivo deste estudo é analisar a composição química da precipitação úmida em amostras coletad... more O objetivo deste estudo é analisar a composição química da precipitação úmida em amostras coletadas em três estações na região de Candiota no Estado do Rio Grande do Sul (RS) Brasil. Amostras foram...
The purpose of this study was to biomonitor metropolitan areas of Porto Alegre (Brazil) for PAHs ... more The purpose of this study was to biomonitor metropolitan areas of Porto Alegre (Brazil) for PAHs associated with atmospheric particles and check their effects on the DNA of the land mollusk Helix aspersa. The sampling sites are located in an urban area with heavy traffic: (i) Canoas, (ii) Sapucaia do Sul, and (iii) FIERGS/Porto Alegre. The samples were collected during a continuous period of 24 hours during 15 days using Stacked Filter Units (SFU) on polycarbonate filters (two separated size fractions: PM10–2.5 and PM<2.5). The concentrations of 16 major PAHs were determined according to EPA. Comet assay on H. aspersa hemolymph cells was chosen for genotoxicity evaluation. This evaluation shows that, in general, the smaller PM-size fractions (PM<2.5) have the highest genotoxicity and contain higher concentrations of extractable organic matter. In addition, associations between chemical characteristics and PM carcinogenicity tend to be stronger for the smaller PM-size fractions.
The purpose of this study is to analyze the chemical composition of wet precipitation in samples ... more The purpose of this study is to analyze the chemical composition of wet precipitation in samples collected at three stations in the Candiota region in the Brazilian state of Rio Grande do Sul (RS). Samples were collected in 2004. Variables analyzed in wet precipitation were pH, conductivity, and concentration of Cl, NO3, SO42 F, Na+, Ca2+, Mg2+, K+, NH4+, Cu, Zn, Fe, Mn, Pb, Ni, Cd, Co, and Cr. SO2 and NO2 distribution over the time were also evaluated. Results have showed that pH < 5.6 are found mostly at Candiota airport (85%), followed by Aceguá (72%) and Três Lagoas (65%). Enrichment Factor of the studied ions in wet deposition revealed higher Ca2+ and SO42 enrichment in Três Lagoas. Factor Analysis applied to metals and major ions allowed identifying the major sources. While Cl, Na+, Mg2+ are of marine origin, SO42, NO3, NH4+ ,F come from anthropogenic sources. Except for Fe and Mn originating from the soil dust, the metals studied showed to have anthropogenic influence The average SO2 and NO2 concentration, as well as SO42 and NO3 in wet precipitation in the Candiota region showed higher concentrations during the warmer months.
The purpose of this work is to study the chemical elements and PAHs associated with atmospheric p... more The purpose of this work is to study the chemical elements and PAHs associated with atmospheric particulate in samples of PM10 collected in the Metropolitan Area of Porto Alegre—MAPA, Rio Grande do Sul, Brazil. In addition, to study the chemical elements associated with particles of different fractions of PM10–2.5 and PM2.5 using dichotomous sampling, in urban (MAPA) and rural areas. Two types of samplers were used: HV PM10 and Dichotomous (PM10–2.5 and PM2.5). Samples were collected during 2002 and 2005. The concentration of the elements Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, and Zn was determined by PIXE (Particle-Induced X-ray Emission), while the concentrations of 16 major PAHs were determined according to EPA with a gas chromatograph coupled to a mass spectrometer (GS/MS). Results showed that elements of anthropogenic origin (V, Zn, Cr, Ni, Cu, and S) were mainly associated with the fraction PM2.5, while the soil dust (Si, Al, Ti and Fe) were found mainly on fraction PM10–2.5. In samples of PM10, the most frequent PAHs found were Bgp, Flt, BaA, Chr, B(b + k)F, BaP and Dba. The types of emission and their association with the atmospheric parameters were studied applying the statistical analysis of the principal component method. The main sources found in the area under study were vehicles, industries (steel mills and a coal-fired power station), dust, sea breeze, and burning.
Uploads
Papers by juliana dallarosa