Receptor models for source apportionment of remote aerosols in Brazil
Description
The PIXE (particle induced X-ray emission), and PESA (proton elastic scattering analysis) method were used in conjunction with receptor models for source apportionment of remote aerosols in Brazil. The PIXE used in the determination of concentration for elements with Z >- 11, has a detection limit of about 1 ng/m3. The concentrations of carbon, nitrogen and oxygen in the fine fraction of Amazon Basin aerosols was measured by PESA. We sampled in Jureia (SP), Fernando de Noronha, Arembepe (BA), Firminopolis (GO), Itaberai (GO) and Amazon Basin. For collecting the airbone particles we used cascade impactors, stacked filter units, and streaker samplers. Three receptor models were used: chemical mass balance, stepwise multiple regression analysis and principal factor analysis. The elemental and gravimetric concentrations were explained by the models within the experimental errors. Three sources of aerosol were quantitatively distinguished: marine aerosol, soil dust and aerosols related to forests. The emission of aerosols by vegetation is very clear for all the sampling sites. In Amazon Basin and Jureia it is the major source, responsible for 60 to 80% of airborne concentrations. (Author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Utilizando-se das tecnicas de analise elementar PIXE (Particle Induced X-ray Emission) e PESA (Proton Elastic Scattering Analysis), foi feita uma aplicacao de Modelos Receptores na determinacao da estrutura de fontes de aerossois de regioes remotas no Brasil. O metodo PIXE foi utilizado na medida das concentracoes de elementos com Z >- 11, em um limite de deteccao de 1 ng/m3. O PESA determinou as concentracoes de C, N e O na fracao fina do aerosol amostrado na Amazonia. Foram realizadas amostragens em Jureia (SP), Fernando de Noronha, Arembepe (BA), Firminopolis (GO), Itaberai (GO) e na Amazonia. Para a coleta do aerosol utilizou-se Impactadores em Cascata, Amostradores de Particulado Fino e Grosso e Amostradores de Filtro Sequencial. Para a identificacao de fontes dos aerossois amostrados, foram aplicados tres Modelos Receptores: o Modelo de Balanco de Massa, a Regressao Linear Multipla Stepwise e a Analise de Fatores Principais. Em geral, as concentracoes elementares e gravimetricas medidas para todas as localidades foram preditas dentro dos desvios experimentais, e foram satisfatoriamente explicadas pelos modelos. Tres fontes de aerossois foram discriminadas em termos quantitativos: o aerosol emitido pelo mar, o originario do solo e o relacionado a vegetacao. A emissao de aerossois pela vegetacao e um resultado novo, e foi evidenciado nos tres Modelos Receptores em todas as localidades amostradas. Na Amazonia e em Jureia, a floresta e a maior fonte de aerossois, e e responsavel por 60 a 80% da materia particulada em suspensao no ar. (Autor)Files
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Additional details
Additional titles
- Original title (Portuguese)
- Modelos receptores aplicados a determinacao da estrutura de fontes aerossois remotos
Publishing Information
- Imprint Pagination
- 196 p.
- Report number
- INIS-BR--606
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 18030476
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- AEROSOLS; CARBON; GRAVIMETRIC ANALYSIS; NITROGEN; OXYGEN; PIXE ANALYSIS; PLANTS; USES
- Descriptors DEC
- CHEMICAL ANALYSIS; COLLOIDS; DESTRUCTIVE ANALYSIS; DISPERSIONS; ELEMENTS; NONDESTRUCTIVE ANALYSIS; NONMETALS; QUANTITATIVE CHEMICAL ANALYSIS; SOLS; X-RAY EMISSION ANALYSIS