NDLI: The Role of Metals and their Fractions in the Bacanga River Estuary: an Example of the Anthropogenic Interference in a Tropical Ecosystem

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The Role of Metals and their Fractions in the Bacanga River Estuary: an Example of the Anthropogenic Interference in a Tropical Ecosystem

Content Provider	Semantic Scholar
Author	Silva, Gilmar Silvério Da Corrêa, Luciana Marques, Aldaléa Lopes B. Marques, Edmar Pereira Nunes, Maria De Fátima Sousa, Eliane Rodrigues De Silva, Gilberto Silvério Da
Copyright Year	2015
Abstract	The Bacanga River in the city of São Luís, Maranhão state, Brazil, is an estuary whose hydrology was drastically altered by the construction of a dam and human occupation. To evaluate the role of trace metals (Cu, Cd, Cr, Pb, Ni and Zn) in sediment quality was determined the total concentration of these metals by atomic emission spectrometry by inductively coupled plasma (ICP OES). The physical and chemical characteristics were analyzed by classical methods. The geochemical fractions of metals in the sediment were determined by applying the sequential chemical extraction, according to the European Community's protocol. The results were statistically analyzed using analysis of the principal components and hierarchical analysis. The metal concentrations show that Pb and Cr present risk to aquatic life in accordance with criteria developed by the Canadian Environmental Agency. Other metals are below this threshold and rarely offer risk to aquatic life, although they are at higher levels to natural although they are at higher levels than natural conditions. Partial lability of metals followed the sequence: Zn (63.4%)> Cu (53.5%)> Cd (50.7%)> Pb (47.0%)> Ni (40.8%)> Cr (35.0%), becoming a factor that minimizes environmental risk. The results of this work indicate that the sediments are contaminated with trace metals and present a risk to aquatic life (Pb and Cr), which requires immediate action to minimize/eliminate pollution sources.
Starting Page	1130
Ending Page	1144
Page Count	15
File Format	PDF HTM / HTML
DOI	10.5935/1984-6835.20150063
Volume Number	7
Alternate Webpage(s)	http://rvq.sbq.org.br/imagebank/pdf/v7n4a07.pdf
Alternate Webpage(s)	https://doi.org/10.5935/1984-6835.20150063
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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