Potentially mobile of heavy metals on the surface sediments in tropical hyper-saline and positive estuaries

Estuarine sediments represent important pools of trace metals, released from both anthropogenic and natural sources. Fluctuations in the water column physicochemical conditions, on the other hand, may transfer metals from solid to liquid compartment and resulting in contamination of the surrounding...

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Published in:	Anais da Academia Brasileira de Ciências Vol. 89; no. 4; pp. 2597 - 2607
Main Authors:	Silva, Carlos A Ramos E, Fonseca, Estefan M DA, Grotto, Beatriz W, Souza, Flavo E S DE, Baptista, Neto, José A
Format:	Journal Article
Language:	English
Published:	Brazil Academia Brasileira de Ciências 01-10-2017
Subjects:	hyper-saline waters MULTIDISCIPLINARY SCIENCES positive estuaries surface sediment weakly bounded heavy metal surface sediment weakly bounded heavy metal positive estuaries hyper-saline waters
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Summary:	Estuarine sediments represent important pools of trace metals, released from both anthropogenic and natural sources. Fluctuations in the water column physicochemical conditions, on the other hand, may transfer metals from solid to liquid compartment and resulting in contamination of the surrounding environment. The present research was carried out to evaluate the weakly bounded heavy metal levels in tropical hyper-saline and positive estuaries, in order to quantify its potentially availability. The monitoring includes five metals (Cd, Cr, Cu, Pb, Zn) and cover nine estuaries in Rio Grande do Norte state/Brazil, including four hypersaline and five true estuaries. 50 surface sediment samples were collected in each estuary. At the same time, organic matter concentrations were evaluated in order to help explaining possible local variations in heavy metal levels. Organic matter results (0.7% - 7.3%) suggest the positive Potengi estuary as the most critical environmental quality situation. On the other hand, according to heavy metals levels, both Conchas and Potengi estuaries registered the higher concentrations of Cr. The highest concentrations were observed in the hyper-saline estuaries, with the exception of the Zn. The present study revealed that the watershed occupation has significantly influenced the heavy metal concentrations in the estuaries.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0001-3765 1678-2690 1678-2690
DOI:	10.1590/0001-3765201720170110