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Master's Dissertation
DOI
10.11606/D.43.2009.tde-11052009-164547
Document
Author
Full name
Hellen Cristine dos Santos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Added, Nemitala (President)
Appoloni, Carlos Roberto
Pascholati, Paulo Reginaldo
Title in Portuguese
Análise de elementos traço em amostras de sedimento da região do Rio Toledo
Keywords in Portuguese
Elementos traço
Física Nuclear
Física Nuclera (aplicações)
PIXE
Sedimento
Abstract in Portuguese
Neste trabalhado s~ao caracterizados amostras de sedimento de vários pontos ao longo do Rio Toledo-PR, usando a técnica PIXE (Particle Induced XRays Emission), a fim de quantificar elementos traço que podem nos fornecer as possíveis fontes de poluentes deste rio. As amostras foram coletadas em seis pontos do leito do rio, durante um período de doze meses (12/2001 a 11/2002). O material coletado foi seco à temperatura ambiente, depois de peneirado e moido, e compactado em pastilhas. A irradiação das amostras foi realizada no LAMFI ( Laboratório de Análises de Materiais por Feixe Iônico) utilizando um feixe monoenergético de H+ de 2:39 MeV. A detecção dos raios X foi efetuada por um detector Si(Li) e uma eletrônica padrão. A análise dos espectros PIXE, usando o programa AXIL, nos permitiu identificar e quanti ficar alguns dos elementos presentes na amostra. As amostras analisadas são alvos grossos, assim sendo as concentrações necessitam de uma validação, para isto uma amostra referenciada (sedimento do Rio Búfalo - RM 8704) foi utilizada nos cálculos das concentrações elementares. Nas amostras analisadas foram identificados 18 elementos, sendo estes: Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr e Pb. Destes elementos decidimos monitorar os seguintes: V, Cr, Mn, Co, Ni, Cu, Zn e Pb.
Title in English
Analysis of trace elements in sediment samples from the region fo river Toledo
Keywords in English
Nuclear physics
Nuclear physics (applications)
PIXE
Sediment
Trace Elements
Abstract in English
In this work we characterize sediment samples from several points in the River Toledo - PR, using the PIXE (Particle Induced X-Ray Emission) spectroscopy technique, in order to quantify trace elements in these samples aiming to provide information about pollution levels for trace elements. The samples were collected in six points of river, during a period of twelve months (12/2001 to 11/2002). The collected material was air-dried at room temperature and then pressed in pellets. The samples were irradiated under vacuum using a H+ beam of 2,39MeV in the LAMFI (Laboratório de Análises de Materiais por Feixe Iônico). Produced x-rays were detected using a Si(Li) detector and a standard electronics. From analyzes of the PIXE spectra was possible to identify and quantify some elements present in the samples as well could quantify them, for this analyzes we used the Axil program to analyze the spectra. A multi-elemental referenced material (Búfalo River sediment - RM 8704) was used to validate the PIXE analysis with thick targets. Twelve months of monitoring of six river points were analyzed and these allowed us to identify 18 elements such as Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr e Pb. The elements were monitored: V, Cr, Mn, Co, Ni, Cu, Zn e Pb.
 
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Santos_Hellen.pdf (24.87 Mbytes)
Publishing Date
2009-05-12
 
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