Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/6809
Title: Study of the effect of pH, salinity and DOC on fluorescence of synthetic mixtures of freshwater and marine salts
Author: Esteves, Valdemar I.
Santos, Eduarda B. H.
Duarte, Armando C.
Issue Date: 1999
Publisher: Royal Society of Chemistry
Abstract: In order to provide support for the discussion of the fate of organic matter in estuaries, a laboratory simulation was performed by changing freshwater ionic strength, pH and organic matter content. The change in spectroscopic characteristics caused by variations in salinity, pH and organic matter concentration in the filtered samples was observed by UV-Vis and fluorescence spectroscopy. The increase in emission fluorescence intensity of dissolved organic matter (DOM) due to increasing salinity (in the range 0 to 5 g l−1) is affected by the pH of the samples. The emission fluorescence intensity at the three maxima observed in the fluorescence spectra, is linearly correlated with dissolved organic carbon (DOC) concentration at several salinity values in the same sample. The increase in organic matter concentration caused a shift in the emission peak wavelength at 410 nm for several salinity values.We concluded that it is necessary to take into account the influence of salinity and pH on emission fluorescence of dissolved organic matter if it is to be used as a tracer in estuarine or near shore areas.
Peer review: yes
URI: http://hdl.handle.net/10773/6809
DOI: 10.1039/A902529D
ISSN: 1464-0325
Appears in Collections:DQ - Artigos
PT Mar - Artigos
Ria - Artigos

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