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Previous issue date: 2016-06-28 / Este trabalho teve como objetivo elaborar uma caracteriza??o qu?mica de aeross?is atmosf?ricos s?lidos finos (MP2.5) coletados por um Impactador Harvard na cidade de Natal, capital do estado do Rio Grande do Norte, Brasil. A amostragem foi feita diariamente, utilizando filtros de quartzo de 37 mm. Utilizaram-se t?cnicas de gravimetria, quantifica??o de Black Carbon (BC) e an?lise de Fluoresc?ncia de Raio-X para a an?lise destes filtros. A amostragem de MP2.5 ocorreu de forma cont?nua no per?odo de 03 de mar?o de 2015 a 31 de Dezembro de 2015. Tamb?m foram feitas simula??es de dispers?o e deposi??o deste material particulado usando o modelo de trajet?rias HYSPLIT com o objetivo de identificar a origem e o destino desses poluentes na atmosfera. Os resultados mostram que as concentra??es de massa m?dias mensais variaram de 2,98 a 14,43 ?g/m3 para o MP2.5 no per?odo analisado. J? as concentra??es m?dias di?rias de MP2.5 variaram de 0,25 a 62,79 ?g/m3 no mesmo per?odo. As an?lises de BC mostraram que o m?s de junho apresentou o maior pico de concentra??o de 3,42 ?g/m?. Atrav?s da an?lise de concentra??o do BC para os dias da semana foi poss?vel observar nos gr?ficos box plot que as concentra??es no s?bado e domingo tendem a ser menores que nos demais dias da semana, isto pode estar associado ao efeito da diminui??o do tr?fego de ve?culos nestes dias. Os dias de semana, de segunda a sexta-feira, apresentaram as maiores dispers?es de valores de concentra??o de BC em que o intervalo interquartil foi superior aos dias de s?bado e domingo, mostrando que as concentra??es de BC s?o maiores durante a semana do que nos finais de semana tendo em vista que o tr?fego de ve?culos ? mais intenso. A partir das coletas obtidas pelo amostrador de particulado fino e an?lise por Fluoresc?ncia de Raio-X (EDX) foi poss?vel identificar os elementos com maior concentra??o presentes nos filtros: o S, K, Si, Al, Cl, Fe, P, Ca, Mn e Ca. A maioria dos componentes ? de origem antropog?nica de acordo com o fator de enriquecimento, sendo Na, Mg, Sn, Zn, Al, Fe e Ti proveniente de fontes naturais. Os resultados das concentra??es de MP2.5 foram relacionados estatisticamente com vari?veis meteorol?gicas para obter informa??es sobre os efeitos dessas vari?veis sobre a concentra??o de MP. / This study had as objective a chemical characterization of PM 2.5 aerosol collected by a Harvard Sampler in Natal, capital of the state of Rio Grande do Norte, Brazil. Sampling was performed daily using a 37 mm quartz filters. Gravimetric techniques were used, as well as quantification of Black Carbon (BC), and X-ray fluorescence analysis. Also, simulations were made to understand dispersion and deposition of the particulate matter using trajectories of the HYSPLIT model in order to know the origin and fate of these pollutants in the atmosphere. The sampling of PM2.5 occurred continuously for the period from March 03, 2015 to December 2015. The results showed that the monthly averages ranged from 2.98 a 14.43 ?g/m3 for the analyzed PM2.5 period, while the daily average concentrations ranged from 0.25 a 62,79 ?g/m3 for PM 2.5 during the same period. The BC analysis showed that the month of June showed the highest peak of BC concentration of approximately 3.42 ?g/m3. Through the BC concentration analysis by weekdays it was observed in the box plot graphs that the concentrations on Saturday and Sunday tend to be smaller than the other days of the week. This can be associated with the effect of the reduction in vehicle traffic during these days. The days from Monday through Friday, showed the highest dispersion of BC concentrations in which the interquartile range was greater than the days of Saturday and Sunday, showing that BC concentrations are larger during the week than on weekends since vehicle traffic is more intense. From the samples obtained by the fine particulate sampler and analysis by X-ray fluorescence (EDX) it was possible to identify the elements with the highest concentration present in the filters: S, K, Si, Al, Cl, Fe, P, Ca, Mn and Ca. Most of these components were of anthropogenic origin according to the enrichment factor, and Na, Mg, Sn, Zn, Al, Fe and Ti are from natural sources. The results of PM2.5 concentrations were statistically related to meteorological variables for information about the effects of these variables on the concentration.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22143 |
| Date | 28 June 2016 |
| Creators | Duarte, Edicl? de Souza Fernandes |
| Contributors | 23182367803, http://lattes.cnpq.br/6590472437235971, Montilla-rosero, Elena, 07344695197, Fernandes, Glauber Jos? Turolla, 72074442491, http://lattes.cnpq.br/6067867622712912, Spyrides, Maria Helena Constantino, 79203183434, http://lattes.cnpq.br/5023632543506327, Godoi, Ricardo Henrique Moreton, Hoelzemann, Judith Johanna |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIAS CLIM?TICAS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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