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Previous issue date: 2009-02-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The aim of this study was to quantify the presence of major and minor elements in the sediments of the Jundia?-Potengi estuary, bordering the municipalities of Maca?ba, Natal and S?o Gon?alo do Amarante in the state of Rio Grande do Norte, Brazil, considering the evidence of anthropic activity
along this estuary, resulting in pollution by treated and untreated wastewaters as well as those produced by industry and shrimp farming. The assessment of the environmental status of this estuary was based on physical-chemical
parameters, such as granulometry, organic matter and the major (Al, Fe, Mn and P) and minor (Cd, Cr, Cu, Ni, Pb and Zn) elements found in sediment samples. Two collections were made at 12 georeferenced points along the channel of the estuary at different times. Granulometric analysis was carried out and the percentage of organic matter was determined. The sediments were microwave digested using acid digestion and quantitative analyses of the elements Al, Fe, Cd, Cr, Cu, Mn, Ni, P, Pb and Zn were performed by inductively coupled plasma optical emission spectrometry. Sediment analysis
followed the methodology proposed by US EPA 3051A for total elements analysis. The small correlation between the organic matter and the elements studied here suggests that they are of geochemical rather than anthropic origin. The analytical results obtained from the bottom sediment samples in the study area show that the concentration of elements was below the reference values for standard shales (Turekian & Wedepohl, 1961) at the vast majority of points
analyzed, ruling out a possible contamination by metals / Este trabalho teve como objetivo avaliar, por meio da quantifica??o, a presen?a dos elementos maiores e menores nos sedimentos do Estu?rio Jundia?-Potengi localizado as margens dos munic?pios de Maca?ba, Natal e S?o
Gon?alo do Amarante no Estado do Rio Grande do Norte, considerando as evid?ncias de atividades antr?picas ao longo deste estu?rio, no qual se destacam a polui??o por efluentes dom?sticos, tratados e sem tratamento, efluentes industriais e de carciniculturas. A avalia??o do estado ambiental
desse estu?rio foi feito atrav?s da determina??o dos par?metros f?sicoqu?micos, como granulometria, mat?ria org?nica e elementos maiores, Al, Fe, Mn e P, e elementos menores, Cd, Cr, Cu, Ni, Pb e Zn em amostras de
sedimento deste estu?rio. As coletas foram feitas em 12 pontos, georefer?nciados, na calha, ao longo desse estu?rio, e em duas coletas com per?odos distintos. Foram feitas as determina??es das porcentagens de mat?ria org?nica e a an?lise granulom?trica. A digest?o dos sedimentos foi feita com um aparelho de microondas por digest?o ?cida e as an?lises quantitativas dos elementos Al, Fe, Cd, Cr, Cu, Mn, Ni, P, Pb e Zn por espectrometria de emiss?o ?tica com plasma acoplado indutivamente Para a an?lise dos
sedimentos tomou-se como refer?ncia a metodologia proposta pela US EPA 3051A para a an?lise dos elementos. A pequena correla??o da mat?ria org?nica com os elementos estudados neste trabalho sugere que estes n?o sejam de origem antr?pica e sim de suporte geoqu?mico. Os resultados
anal?ticos apresentados pelas amostras de sedimentos de fundo para a ?rea estudada mostraram que a concentra??o dos elementos ficou abaixo dos valores de refer?ncia do folhelho padr?o de Turekian & Wedepohl (1961) na
grande maioria dos pontos analisados, descaracterizando uma poss?vel contamina??o por metais
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17612 |
| Date | 27 February 2009 |
| Creators | Medeiros, Rina Lourena da Silva |
| Contributors | CPF:13893734449, http://lattes.cnpq.br/2791074318745945, Moura, Maria de F?tima Vit?ria de, CPF:31482015404, http://lattes.cnpq.br/2959800336802498, Mendes, Teresa Maria Fernandes de Freitas, CPF:42562805020, http://lattes.cnpq.br/8519167554348596, Melo, Jailson Vieira de, Silva, Djalma Ribeiro da |
| 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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