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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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