A study on trace element contamination in the metropolitan region of São Paulo (São Paulo, Brazil), using the livers of great egret (Ardea alba) as a biondicator
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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Resumo
Herons and egrets are considered bioindicators suitable for the assessment of
environmental contamination, since they occupy the top of the food chain, and tend
to accumulate high concentrations of toxic elements in their tissues. So, in this
study the livers of the great egret (Ardea alba) were used as a bioindicators of
changes in trace element concentrations between 2006 and 2011 (6 years) in the
aquatic environments of the Metropolitan Region of São Paulo (SPMR). The levels of trace elements found in livers of males and females were also compared. The
method of Neutron Activation Analysis (NAA) was used in these analyses for the
determination of Br, Co, Cs, Fe, K, Mg, Mn, Na, Rb, Se and Zn, and Atomic
Absorption Spectrometry Method (AAS) for the determination of Cd and Hg in liver
samples. In previous studies, elevated concentrations of trace elements such as Cu,
Fe, Hg, Mn and Zn were found in livers. In addition to the previous published data,
the results for six trace elements (Co, Cs, Fe, Rb, Se and Zn) of five liver samples
collected during 2011 were included. The concentrations of Br, Co, Fe, K, Mg,
Na and Se found in livers in 2011 remained at similar levels to those obtained in
2006. However, increase in levels of Cd, Cu, Hg, Mn and Zn in 2011 was obtained,
probably related to an increase in environmental depositions from anthropogenic
sources. Female egrets presented lower levels of Co, Cs, Se and Zn than males.
Selenium requires great attention due the differences indicating possible transference
to the eggs and Se can be toxic for embryos. Results obtained in this study suggests
a continuous monitoring using great egret livers in order to improve the knowledge
of temporal trends of contamination in aquatic environments of the SPMR.
Como referenciar
SILVA, R.C.A.; SAIKI, M.; MOREIRA, E.G.; MEIRA, P.T.; OLIVEIRA, S. A study on trace element contamination in the metropolitan region of São Paulo (São Paulo, Brazil), using the livers of great egret (Ardea alba) as a biondicator. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 46-47. Disponível em: http://repositorio.ipen.br/handle/123456789/28744. Acesso em: 11 May 2024.
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.