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Previous issue date: 2011-02-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The proposal of this work is to evaluate the influence of the organic matter on the
results of the analyses of the metals (Zn, Pb, Al, Cu, Cr, Fe, Cd e Ni) for Atomic
Absorption Spectrometry (AAS), so much in the extraction stage as in the reading
using for that the chemometrics. They were used for this study sample of bottom
sediment collected in river Jundia? in the vicinity of the city of Maca?ba-RN,
commercial humus and water of the station of treatment of sewer of UFRN. Through
the analyses accomplished by EAA it was verified that the interference of the organic
matter happens in the extraction stage and not in the reading. With relationship to the
technique of X Ray Fluorescence Spectrometry (XRFS), the present work has as
intended to evaluate the viability of this technique for quantitative analysis of trace
metals (Cr, Ni, Cu, Zn, Rb, Sr and Pb) in having leached obtained starting from the
extraction with acqua regia for an aqueous solution. The used samples constitute the
fine fraction (<0.063 mm) of sediments of swamp of the river Jundia?. The preparation
of tablets pressed starting from the dry residue of those leached it allowed your
analysis in the solid form. This preliminary study shows that, in the case of the
digestion chemistry partially of the fine fractions of bottom sediments used for
environmental studies, the technique of applied EFRX to the analysis of dry residues
starting from having leached with acqua regia, compared her it analyzes of the
leached with ICP-OES, it presents relative mistakes for Cu, Pb, Sr and Zn below
10% / A proposta deste trabalho ? avaliar a influ?ncia da mat?ria org?nica sobre os
resultados das an?lises dos metais (Zn, Pb, Al, Cu, Cr, Fe, Cd e Ni) por
Espectrometria de Absor??o At?mica (EAA), tanto na etapa de extra??o quanto na
leitura utilizando para isso a quimiometria. Foram utilizados para este estudo
amostra de sedimento de fundo coletadas no Rio Jundia? nas imedia??es da cidade
de Maca?ba-RN, h?mus comercial e ?gua da esta??o de tratamento de esgoto da
UFRN. Atrav?s das an?lises realizadas por EAA verificou-se que a interfer?ncia da
mat?ria org?nica ocorre na etapa de extra??o e n?o na leitura. Com rela??o ?
t?cnica de Espectrometria de Fluoresc?ncia de Raio-X (EFRX), o presente trabalho
tem como proposta avaliar a viabilidade desta t?cnica para an?lise quantitativa de
metais tra?os (Cr, Ni, Cu, Zn, Rb, Sr e Pb) em lixiviados obtidos a partir da extra??o
com ?gua r?gia para uma solu??o aquosa. As amostras utilizadas constituem a
fra??o fina (< 0.063 mm) de sedimentos de mangue do Rio Jundia?. A prepara??o de
pastilhas prensadas a partir do res?duo seco dos lixiviados permitiu sua an?lise na
forma s?lida. Este estudo preliminar mostra que, no caso da digest?o qu?mica parcial
das fra??es finas de sedimentos de fundo utilizadas para estudos ambientais, a
t?cnica de EFRX aplicada ? an?lise de res?duos secos a partir de lixiviados com
?gua r?gia, comparada a analise do lixiviado com ICP-OES, apresenta erros
relativos para Cu, Pb, Sr e Zn abaixo de 10%
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17643 |
| Date | 21 February 2011 |
| Creators | Martins, Ilton S?vio Batista |
| Contributors | CPF:50073788449, http://lattes.cnpq.br/7275955550556570, Wanderley Neto, Alcides de Oliveira, CPF:00738841463, http://lattes.cnpq.br/4789528535524269, Moura, Jos? Ant?nio de, CPF:83791680463, http://lattes.cnpq.br/9124578454468834, Melo, Jailson Vieira de |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Qu?mica, UFRN, BR, F?sico-Qu?mica; Qu?mica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| 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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