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Characterization of dissolved organic matter in an urbanized estuary located in Northeastern Brazil

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Abstract

The Sal River estuary, which is located in the state of Sergipe, Northeastern Brazil, stands out as an urban estuary, anthropogenically impacted by untreated and treated wastewater discharge. Synchronous fluorescence spectroscopy and measurement of dissolved organic carbon (DOC) were used for characterization of dissolved organic matter (DOM) in the estuarine water. Dissolved organic carbon concentrations ranged from 7.5 to 19.0 mg L−1 and, in general, the highest values were recorded during dry season. For both seasons (dry and rainy), DOC presented an inverse linear relationship with salinity, which indicates a conservative dilution of organic matter coming into the estuary. During rainy season, anthropogenic organic constituents and humic substances from land-based sources predominated in DOM composition, carried by river flow. Whereas during the dry season, it has been observed a significant increase of products generated by microbial degradation of anthropogenic organic matter. The relationships between fluorescence intensity and salinity suggest a conservative behavior during rainy season and a non-conservative behavior during dry season, with addition of fluorescent organic matter into the intermediate zone of the estuary. Photodegradation by action of sunlight caused a decrease in fluorescence intensity of humic and tryptophan-like constituents and the release of photoproducts, resulting in an increase in fluorescence intensity of protein-like constituents.

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Authors and Affiliations

  1. Department of Chemistry, Federal University of Sergipe, São Cristóvão, SE, 49100-000, Brazil

    Maria de Lara Palmeira de Macedo Arguelho, José do Patrocínio Hora Alves, Adnívia Santos Costa Monteiro & Carlos Alexandre Borges Garcia

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  1. Maria de Lara Palmeira de Macedo Arguelho
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  2. José do Patrocínio Hora Alves
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  3. Adnívia Santos Costa Monteiro
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  4. Carlos Alexandre Borges Garcia
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Correspondence to Maria de Lara Palmeira de Macedo Arguelho.

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Arguelho, M.d.L.P.d.M., Alves, J.d.P.H., Monteiro, A.S.C. et al. Characterization of dissolved organic matter in an urbanized estuary located in Northeastern Brazil. Environ Monit Assess 189, 272 (2017). https://doi.org/10.1007/s10661-017-5966-7

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