Characterization of dissolved organic matter in the Piauí river estuary, Northeast Brazil

Journal of the Brazilian Chemical Society

Adnivia Santos Costa¹  Elisangela De Andrade Passos¹  Carlos A. B. Garcia¹  José Do Patrocinio H. Alves¹ 

[1] ,Universidade Federal de Sergipe Departamento de Química São Cristóvão SE ,Brazil

关键词: natural organic matter;    Piauí River;    estuary;    fluorescence;   

DOI  :  10.1590/S0103-50532011001100017

来源: SciELO

【 摘 要 】

Fluorescence spectroscopy and dissolved organic carbon (DOC) measurements were used to characterize the dissolved organic matter (DOM) in the Piauí River estuary, a tropical estuary situated in the State of Sergipe, Northeast Brazil. Fluorescence intensities were greater during the rainy period than the dry period, demonstrating that variability in the fluorescence properties of the DOM was determined mainly by the fluvial discharge and the dilution processes occurring in the estuary. During the rainy period, tryptophan-like and humic substances were the main components of the DOM, while during the dry period there was a significant increase of protein-like constituents. Relationships identified between fluorescence intensities and salinity were indicative of non-conservative behavior of the fluorescent DOM. DOC showed behavior that was conservative during the dry period, and non-conservative during the rainy period, with production of DOC in the upper reaches of the estuary. The complexation of DOM with Cu(II), studied using the fluorescence suppression technique, showed the complexation potentials of protein, tryptophan and humic type fluorophores.

【 授权许可】

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