Avaliação dos episódios de altas concentrações de ozônio no bairro de Bangu, Rio de Janeiro

• Ano de defesa: 2017
• Autor(a) principal: Geraldino, Claudio Gabriel Pinheiro
• Orientador(a): Martins, Eduardo Monteiro
• Banca de defesa: Silva, Alexsandro Araújo da , Corrêa, Sérgio Machado , Silva, Cleyton Martins da , Souza, Simone Lorena Quitério de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade do Estado do Rio de Janeiro
• Programa de Pós-Graduação: Programa de Pós-Graduação em Química
• Departamento: Centro de Tecnologia e Ciências::Instituto de Química
• País: BR
• Palavras-chave em Português: Ozônio; NOx; COV; alta concentração
• Palavras-chave em Inglês: Ozone; nitrogen oxides; VOCs; high concentrations
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::ANALISE DE TRACOS E QUIMICA AMBIENTAL
• Link de acesso: http://www.bdtd.uerj.br/handle/1/15855

As a secondary pollutant formed by photochemical oxidation process of Volatile Organic Compounds (VOCs) in the presence of nitrogen oxides (NOx), tropospheric ozone is one of the main compounds in urban atmosphere. The tropospheric O3 formation is influenced by many factors, including topography, wind direction and speed, temperature, humidity, solar radiation and its precursors concentrations. This work s objective was to identify which conditions lead to exceedances of air quality limits for ozone known as high concentrations episodes of ozone in the neighborhood of Bangu, Rio de Janeiro city. The monitoring of 50 major VOCs in this region was performed using the U.S.EPA Method TO-15 and meteorological and criteria air pollutant concentrations data, provided by the monitoring station of the Municipal Environment Secretariat, were compiled. 14 samples were collected during 7 days between July and August of 2016. VOCs concentrations were observed between 90 µg m-3 and 421 µg m-3. It was observed an ozone high concentration episode on July 14th 2016, which concentration was 160 µg m-3. The data were analyzed using descriptive and multivariate statistics. In addition, the mechanistic and kinetic reactivity of the quantized VOCs were analysis and a high concentration episode of ozone was simulated using the model OZIPR and the chemical mechanism SAPRC. Finally, the influence of various parameters in the model results was analyzed. From these simulations and statistical analysis, it was possible to infer that the main factors that determine the formation of ozone in days of episodes of high concentration in the case of Bangu are temperature and solar radiation. The relation of VOCs/NOx concentration, which is a consequence of emission sources, is also important in these concurrency episodes