Inorganic As speciation and bioavailability in estuarine sediments of Todos os Santos Bay, BA, Brazil |
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Authors: | V Hatje SM Macedo RM de Jesus G Cotrim KS Garcia AF de Queiroz SLC Ferreira |
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Institution: | aLaboratório de Oceanografia Química, Instituto de Química, UFBA, Campus Ondina, Salvador, BA, 40170-290, Brazil;bInstituto de Química, UFBA, Campus Ondina, Salvador, BA, 40170-290, Brazil;cInstituto Nacional de Ciência e Tecnologia, INCT, de Energia e Ambiente, UFBA, Salvador, BA, 40170-290, Brazil;dDepartamento de Ciências Exatas e Tecnológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, 45650-000, Brazil;eDepartamento de Geoquímica, Universidade Federal da Bahia, BA, 45650-000, Brazil |
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Abstract: | The spatial distribution of As (total As, As (III) and As (V)) in estuarine sediments from the main tributaries of Todos os Santos Bay, BA, Brazil, was evaluated under high and low flow conditions. The concentrations 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 locations 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. |
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Keywords: | Speciation Arsenic Paraguaç u River Subaé River Jaguaripe River Slurry sampling |
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