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Título: Spectroscopic investigation of humic substances in a tropical lake during a complete hydrological cycle
Autor(es): OLIVEIRA, J.L.; BOROSKI, M.; AZEVEDO, J.C.R.; NOZAKI, J.
Palavras-chave [PT]:

Matéria orgânica dissolvida. Carbono orgânico dissolvido. Absorvância. Vento. Sazonal.

Natural organic matter. Dissolved organic carbon. Absorbance. Wind. Seasonal.

Abstract: Fluorescence and UV-VIS techniques were employed for the investigation of natural organic matter (NOM) of a tropical lake. The relationships of absorbance/dissolved organic carbon (A/DOC), fluorescence intensity/dissolved organic carbon (FI/DOC), fluorescence ratio (FR), and peak wavelength with the highest intensity (PW) were used to distinguish the pedogenic or aquagenic origin of NOM. The values of FR, PW and A285/DOC of high waters (HW) or flooded period samples and of low waters (LW) period samples of the dry season, except for September 2002, confirm the predominance of pedogenic material. The spectra of water were similar to the standard fulvic acid (FA), and the spectra of FA from the lake were similar to the nearby soils, indicative of pedogenic predominance. The results confirm that the dissolved NOM of Patos Lagoon – MS (Brazil), in all sampling periods, predominantly consisted of humic substances (FA) of pedogenic origin.

OLIVEIRA, Janaina L.; BOROSKI, Marcela; AZEVEDO, Júlio C.R.; NOZAKI, Jorge. Spectroscopic investigation of humic substances in a tropical lake during a complete hydrological cycle. Acta Hydrochimica et Hydrobiologica, Weinheim, v.34, no.6, p.608-617, 2006.

Received: September 19, 2004; accepted: November 19, 2006

Responsavel: salete
Categoria: Aplicação
Formato: Documento PDF
Arquivo: AzevedoJCR.pdf
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Criado: 09-05-2008 10:09
Atualizado: 27-06-2008 11:35
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