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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/4786

Title: Inorganic As speciation and bioavailability in estuarine sediments of Todos os Santos Bay, BA, Brazil
Other Titles: Elsevier
Authors: Hatje, Vanessa
Macedo, Samuel Marques
Jesus, R. M. de
Cotrim, G.
Garcia, K. S.
Queiroz, Antônio Fernando de Souza
Ferreira, Sergio Luis Costa
Keywords: Speciation;Arsenic;Paraguaçu River;Subaé River;Jaguaripe River;Slurry sampling
Issue Date: 2010
Abstract: The spatial distribution of As (total As, As (III) and As (V)) in estuarine sediments from the main tributar- ies of Todos os Santos Bay, BA, Brazil, was evaluated under high and low flow conditions. The concentra- tions of As were determined using a slurry sampling procedure with hydride generation atomic absorption spectrometry (HG-AAS). The highest concentrations were observed at estuary mouths, and exceeded conservative lower threshold value (Threshold Effects Level; TEL). Due to the oxic conditions and abundance of Mn and Fe (oxyhydr)oxides in the sediments, most inorganic arsenic in the Subaé and Paraguaçu estuaries was present as As (V). Nevertheless, the concentration of As (III) at several loca- tions along the Jaguaripe River were also above the TEL value, suggesting that As may be toxic to biota. In the Subaé estuary, antropogenic activities are the main source of As. At the Jaguaripe and at Paraguaçu estuaries, nevertheless, natural sources of As need to be considered to explain the distribution patterns.
Description: p.2225–2232
URI: http://www.repositorio.ufba.br/ri/handle/ri/4786
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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