Geostatistical mapping of the concentration of Zn in the Bay of Sepetiba in Rio de Janeiro, Brazil
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2004
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INTERNATIONAL SYMPOSIUM ENVIRONMENTAL GEOCHEMISTRY IN TROPICAL COUNTRIES, 4th
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Resumo
In general, the growth of the economical activities in a country is
directly conelated to the increase of pressure on natural systems,
leading several authorities and specialists to the discussion of the
impacts generated and the main actions to minimize them. Over the last years, such discussions have established new paradigms in the
means of production in terms of sustainable growth and preservation of
natural resources for future generations. In particular, the concern with
the water systems has been great, since those are the ones that are
most affected by industrial and domestic activities. Within this confext,
this study will approach the contamination with Zn of the Bay of
Sepetiba, located in the state of Rio de Janeiro, in the southwest region
of Brazil. As a result of the industrial and urban expansion over the last
three decades, the region has been rather impacted, particularly with
the contamination with Zn, as it has been recorded by several authors.
With the purpose of assessing precisely the human action concerning
the Zn in the region, the concentrations of this metal were determined
by instrumental neutron activation analysis (INAA) in 60 samples
geographically referred in a regular network. The distribution and
evaluation of the risks due to the contamination with Zn in Sepetiba
were investigated through classic statistical techniques and
geostatistics. In order to limit the effects of discrepant values and later
geostatistical analysis, the data were normalized through a Box-Cox
transformation. The parameters of the spatial disfribution of the
concentrations of Zn were estimated through the adjustment from the
theoretical to the experimental variogram via method of the minimum
pondered squares. The mapping of the concentrations of the metal
studied in this work was carried out through ordinary kriging. In order to
evaluate the quality of the geostatistical analysis, the prection
variances maps was designed and the cross-validation was carried
out. Aiming at identifying the most critical areas with regards to the
confamination with Zn, it was constructed the map of probability of
concentration that exceed the contents found in the regions that did
not undergo human influence. The results obtained in this study provide
precise information to evaluate the risks posed by high concentrations of Znin the Bay of Sepetiba, with the purpose of aiding the authorities
in their decisions to effectively control the problem.
Como referenciar
RIBEIRO, A.P.; FIGUEIREDO, A.M.G.; WASSERMAN, J.C.; SANTOS, J.O. Geostatistical mapping of the concentration of Zn in the Bay of Sepetiba in Rio de Janeiro, Brazil. In: INTERNATIONAL SYMPOSIUM ENVIRONMENTAL GEOCHEMISTRY IN TROPICAL COUNTRIES, 4th, 25-29 Oct, 2004, Buzios, RJ. Abstract... p. 652-654. Disponível em: http://repositorio.ipen.br/handle/123456789/22556. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.